Imaging Apparatus

Abstract

An imaging apparatus 10 for generating an image of a subject including a scanning arrangement which includes an energy emitting source 20 and a detector 22 housed within a housing 12. The housing defines a scanning zone 24 in which the subject is operatively positioned for scanning A displacing arrangement 36 which includes a U-shaped belt-and-pulley drive arrangement is configured to displace the scanning arrangement relative to the housing 12 in a scanning direction. The housing 12 has a first door and second door defining a substantially linear pathway through the scanning zone. A motor 38 and horizontal drive belts 40 are disposed below the scanning zone and are not displaced relative to the housing in the scanning direction in which the energy emitting source and detector are displaced during scanning such that the displacing arrangement does not restrict or impede movement of the subject through the scanning zone.

Claims

1. An imaging apparatus for generating an image of a subject, the imaging apparatus comprising: a scanning arrangement which includes an energy emitting source and a detector; a housing which houses the scanning arrangement, and which defines an internal scanning zone or area in which the subject is operatively positioned for scanning by the scanning arrangement; a displacing arrangement which serves operatively to interconnect the energy emitting source and detector and is housed within the housing and is configured to displace the scanning arrangement relative to the housing in a scanning direction in order to scan the subject in the scanning zone; a first door which, when open, defines a first opening in the housing; and a second door which, when open, defines a second opening in the housing, wherein the first door and the second door are arranged at or near opposing ends or sides of the housing so as to define a substantially linear path between them, such that, in use, the subject travels in a substantially straight line along the linear path by entering the scanning zone via one of the openings in the housing and exiting the scanning zone via the other one of the openings in the housing; and wherein at least part of the displacing arrangement operatively connecting the energy emitting source and detector together is not disposed in the scanning zone and is not itself displaced relative to the housing in the scanning direction in which the energy emitting source and detector are displaced during scanning such that the displacing arrangement does not restrict or impede movement of the subject through the scanning zone.

2. An imaging apparatus as claimed in claim 1, wherein the part of the displacing arrangement connecting the energy emitting source and detector together is disposed above or below the scanning zone.

3. An imaging apparatus as claimed in claim 2, wherein the displacing arrangement includes a belt-and-pulley drive arrangement which includes first and second drive belts drivingly connected to pulleys in a U-shaped configuration around the scanning zone and a motor drivingly connected to the first drive belts, wherein the motor and a pair of the first drive belts of the belt-and-pulley drive arrangement, which serve to connect the energy emitting source and detector together, are disposed above or below the scanning zone.

4. An imaging apparatus as claimed in claim 3, wherein the second drive belts of the belt-and-pulley drive arrangement of the displacing arrangement is configured to displace the scanning arrangement along a vertical axis of the imaging apparatus, and wherein the first drive belts of the belt-and-pulley drive arrangement of the displacing arrangement extends laterally from one side of the housing to the other.

5. An imaging apparatus as claimed in claim 4, which is devoid of a C-shaped arm mechanically connecting the energy emitting source and detector together.

6. An imaging apparatus as claimed in claim 5, wherein the displacing arrangement is configured collinearly to displace the energy emitting source and the detector relative to the housing.

7. An imaging apparatus as claimed in claim 6, wherein the energy emitting source is secured to a set of transversely spaced apart, vertically extending drive belts on one side of the scanning zone whilst the detector is secured to another opposing set of transversely spaced apart, vertically extending drive belts on the other side of the scanning zone, wherein a lower set of pulleys and an upper set of pulleys, on each side of the scanning zone, are drivingly connected by transversely extending shafts and wherein the motor is located below the scanning zone and is drivingly connected to the lower sets of pulleys via the pair of first drive belts to ensure simultaneous upward or downward displacement of the energy emitting source and detector relative to the housing, wherein each of the source and detector are secured to the set of vertical drive belts by way of an attachment formation which clamps onto the respective vertical drive belts at the same height and side thereof, such that, as the first drive belts are displaced by the motor, the scanning arrangement rises or falls together with one side of the vertical drive belts, and wherein a linear bearing is provided in each corner, adjacent to each vertical drive belt, the energy emitting source and detector both having a pair of linear bearing followers which operatively slide up and down along the linear bearings to ensure linear movement of the scanning arrangement.

8. An imaging apparatus as claimed in claim 1, which includes an image generating unit configured to generate the image of the subject, the image generating unit being interfaced to the detector and to a processor.

9. An imaging apparatus as claimed in claim 8, wherein the housing has a substantially rectangularly cuboidal shape and defines a front, a rear and two sides of the imaging apparatus, the first door being located at the front of the imaging apparatus and the second door being located at the rear of the imaging apparatus such that the subject travels substantially in a straight line through the imaging apparatus as part of a screening process.

10. An imaging apparatus as claimed in claim 9, which is configured to be positioned at a boundary between an unscreened and screened area such that, in use, the subject is required to travel through the scanning zone in order to move from the unscreened to screened area.

11. An imaging apparatus as claimed in claim 1, wherein the housing and doors are configured substantially to seal off internal components of the imaging apparatus from an external environment when the doors are closed, the housing and doors being configured to create an air lock in the scanning zone.

12. An imaging apparatus as claimed in claim 11, which includes an interlock unit which is communicatively coupled to a locking mechanism and a position sensor or switch associated with each door, the interlock unit being configured to provide a hard interlock and being configured to designate both doors as normally locked, the interlock unit further being configured to transmit an unlocking signal to the locking mechanism of one of the doors in response to identification of the subject, wherein the interlock unit is configured to transmit locking signals to the locking mechanism of both doors when scanning is in progress and wherein the interlock unit is configured to retain at least one of the doors in a locked condition at all times.

13. An imaging apparatus as claimed in claim 1, wherein the linear path is bidirectional such that the first door defines an entrance opening and exit opening.

14. An imaging apparatus as claimed in claim 1, which includes one or more biometric or proximity type readers for identification of the subject.

15. An imaging apparatus as claimed in claim 1, which is configured to employ dual energy scanning in combination with time domain integration (TDI) to improve image quality and to reduce the amount of radiation required to produce a high quality image.

16. An imaging apparatus as claimed in claim 1, which has a footprint of less than 2 square meters.

17. An imaging apparatus as claimed in claim 1, wherein the energy emitting source and the detector are positioned on opposing sides of the imaging apparatus, the energy emitting source being configured to emit a beam of x-rays in a transverse anatomical plane of the subject.

18. An imaging apparatus as claimed in claim 17, wherein the detector is configured to permit matter differentiation for imaging purposes by means of binning, thereby allowing the imaging apparatus to distinguish between matter with different atomic numbers.

19. An imaging apparatus as claimed in claim 9, which includes an Uninterrupted Power Supply (UPS) which is communicatively coupled to the processor such that the processor is capable of monitoring a power level associated with the UPS, and wherein imaging of a subject is only commenced if the processor determines that sufficient power is available to complete imaging of the subject and/or to prevent damage to the imaging apparatus should an input power supply, e.g. mains power supply, to the imaging apparatus be disconnected or interrupted.

20. An imaging apparatus as claimed in claim 1, which is configured to identify a subject being scanned for a first time and to assign a unique identifier to the subject, the imaging apparatus being configured to communicate data associated with the unique identifier to a remote server or database, and/or to receive data from the remote server or database.

21. An imaging apparatus as claimed in claim 9, which includes an integrated dose meter which is configured to communicate data to the processor.

22. An imaging apparatus as claimed in claim 1, which includes a display which is configured to display the image to an operator before receiving user input indicating a selected region of the image, the imaging apparatus being configured, in response to receiving the user input, to rescan the selected region using the scanning arrangement.

23. An imaging apparatus as claimed in claim 22, which is configured to rescan the selected region using one or more adjusted scanning parameters.

24. An imaging apparatus as claimed in claim 23, wherein rescanning is carried out at a lower scanning speed than a scanning speed at which the selected region was previously scanned and/or at a different voltage/current from a voltage/current used when the selected region was previously scanned and/or using a different x-ray filter from an x-ray filter previously used to scan the selected region and/or using a different distance between the energy emitting source and the subject from a distance used when the selected region was previously scanned.

25. An imaging apparatus as claimed in claim 24, which is configured to display the rescanned image to the operator.

26. A screening kit comprising: an imaging apparatus as claimed in claim 1; and a holding room attached to or integral with the imaging apparatus, wherein one of the doors of the imaging apparatus leads into an entrance to the holding room.

27. A screening kit as claimed in claim 26, which comprises a container, wherein the imaging apparatus and the holding room are integral with the container such that at least one wall of the container defines at least one wall of the holding room.

28. A method of screening a subject, the method comprising the steps of: providing an imaging apparatus as claimed in claim 1; and directing movement of the subject such that the subject travels in a substantially straight line along the substantially linear path by entering the scanning zone of the imaging apparatus via one of the openings in the housing of the imaging apparatus for scanning by the scanning arrangement and exiting the scanning zone via the other one of the openings in the housing.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0097] The invention will now be further described, by way of example, with reference to the accompanying conceptual drawings.

[0098] In the drawings:

[0099] FIG. 1 shows a three-dimensional view of an embodiment of an imaging apparatus according to the invention;

[0100] FIG. 2 shows another three-dimensional view of the imaging apparatus of FIG. 1;

[0101] FIG. 3 shows a front view of the imaging apparatus of FIG. 1, illustrating a subject standing in the imaging apparatus;

[0102] FIG. 4 shows another three-dimensional view of the imaging apparatus of FIG. 1, illustrating a portion of a displacing arrangement of the imaging apparatus;

[0103] FIG. 5 shows a more detailed three-dimensional view of the portion of the displacing arrangement illustrated in FIG. 4;

[0104] FIG. 6 shows another three-dimensional view of the imaging apparatus of FIG. 1, illustrating a further portion of the displacing arrangement of the imaging apparatus;

[0105] FIG. 7 shows a more detailed three-dimensional view of the portion of the displacing arrangement illustrated in FIG. 6;

[0106] FIG. 8 shows another three-dimensional view of the imaging apparatus of FIG. 1, wherein housing panels and plates of the imaging apparatus are not shown in order to make internal components of the imaging apparatus visible;

[0107] FIG. 9 shows another three-dimensional view of the imaging apparatus of FIG. 1, wherein the housing panels and plates of the imaging apparatus are not shown;

[0108] FIG. 10 shows another three-dimensional view of the imaging apparatus of FIG. 1, wherein the housing panels and plates of the imaging apparatus are not shown;

[0109] FIG. 11 shows another three-dimensional view of the imaging apparatus of FIG. 1, wherein the housing panels and plates of the imaging apparatus are not shown;

[0110] FIG. 12 shows another front view of the imaging apparatus of FIG. 1, wherein the housing panels and plates of the imaging apparatus are not shown;

[0111] FIG. 13 shows a front view of a portion of the displacing arrangement of the imaging apparatus of FIG. 1;

[0112] FIG. 14 shows a front view of a further portion of the displacing arrangement of the imaging apparatus of FIG. 1;

[0113] FIG. 15 shows a bottom view of the imaging apparatus of FIG. 1, wherein the housing panels and plates of the imaging apparatus are not shown;

[0114] FIG. 16 shows a top view of the imaging apparatus of FIG. 1, wherein the housing panels and plates of the imaging apparatus are not shown;

[0115] FIG. 17 shows another three-dimensional view of the imaging apparatus of FIG. 1, wherein certain further components of the apparatus are shown;

[0116] FIG. 18 shows another three-dimensional view of the imaging apparatus of FIG. 1, wherein certain further components of the apparatus are shown;

[0117] FIG. 19 shows a conceptual top view of a screening arrangement which includes the imaging apparatus of FIGS. 1 to 18;

[0118] FIG. 20 shows a conceptual top view of another screening arrangement which includes two imaging apparatuses such as the one of FIGS. 1 to 18;

[0119] FIG. 21 shows a conceptual three-dimensional view of the screening arrangement of FIG. 20; and

[0120] FIG. 22 shows a conceptual top view of a container unit which includes the imaging apparatus of FIGS. 1 to 18.

DETAILED DESCRIPTION WITH REFERENCE TO THE DRAWINGS

[0121] The following description of the invention is provided as an enabling teaching of the invention. Those skilled in the relevant art will recognise that many changes can be made to the embodiments described, while still attaining the beneficial results of the present invention. It will also be apparent that some of the desired benefits of the present invention can be attained by selecting some of the features of the present invention without utilising other features. Accordingly, those skilled in the art will recognise that modifications and adaptations to the present invention are possible and can even be desirable in certain circumstances, and are a part of the present invention. Thus, the following description is provided as illustrative of the principles of the present invention and not a limitation thereof.

[0122] An embodiment of an imaging apparatus (hereinafter referred to as the apparatus) according to the invention is shown in FIGS. 1 to 18 and is generally indicated by reference numeral 10. The apparatus 10 is configured to generate an image of a subject by way of electromagnetic radiation in the form of x-rays.

[0123] The apparatus 10 includes a housing 12 which is shaped and dimensioned to define an internal scanning zone or area 24 therein and to house a number of internal components of the apparatus 10, including a scanning arrangement and a displacing arrangement, as described below. The housing 12 is specifically configured to absorb x-rays and to permit individuals to stand next to the apparatus 10 safely during operation (i.e. while a subject is being scanned inside the housing 12).

[0124] The housing 12 is provided by a plurality of outer panels 14, a base plate 30 and a top plate 32 which are mounted to a frame 15, with a front door 16 and a rear door 18 provided in two of the panels 14 (i.e. a front panel and a rear panel). The housing 12 also defines a platform 34 on which a subject 26 is positioned in the housing 12, in use, as shown in FIG. 3.

[0125] The housing 12 is generally rectangularly cuboidal (when the doors 16, 18 are closed) and, in this specific example, has dimensions of 1691 mm1021 mm2467 mm. In this example, the apparatus 10 thus has a footprint of approximately 1.73 m.sup.2.

[0126] The front door 16 is hingedly connected to a front panel 14 and, when open, defines a first opening in the housing 12, as shown in FIG. 1. The rear door 18 is hingedly connected to a rear panel 14 and, when open, defines a second opening in the housing 12 (the rear door 18 is illustrated in a closed position in the drawings).

[0127] The doors 16, 18 are arranged such that, in use, the subject 26 follows a substantially linear path which includes entering the scanning zone 24 via the opening defined by the front door 16 in the housing 12 and exiting the scanning zone 24 via the opening defined by the rear door 18 in the housing. In other words, the subject 26 travels in a straight line through the apparatus 10 as part of a screening process.

[0128] In this example, the apparatus 10 is configured such that the linear path is unidirectional. In other words, the subject 26 enters the apparatus 10 through the front door 16 and exits through the rear door 18, in a straight line. However, it should be appreciated that the apparatus 10 may be used to facilitate bidirectional screening.

[0129] When the doors 16, 18 are closed, the housing 12 seals off the internal components, and in particular the scanning arrangement and displacing arrangement, which are described below.

[0130] The apparatus 10 includes a scanning arrangement in the form of an energy emitting source 20 and a CsI or GOS type detector 22, best shown in FIGS. 8 to 11. The source 20 and detector 22 are located on opposing sides of the scanning zone 24 defined in the housing 12. The scanning zone 24 is shaped and dimensioned such that the subject 26 is scanned while standing upright in the scanning zone 24, as shown in FIG. 3.

[0131] The energy emitting source 20 transmits an x-ray beam 28 in a transverse anatomical plane of the subject 26. It will be appreciated that the beam 28 is visible in the drawings only for the purpose of better illustrating the structure and functioning of the apparatus 10.

[0132] The apparatus 10 further includes an obtaining unit, which in this embodiment is in the form of a digital camera (not shown). The obtaining unit is configured to obtain data associated with the composition of the body of the subject 26. In other words, when the subject 26 enters the scanning zone 24, the obtaining unit analyses the subject 26 to determine the composition of the subject 26.

[0133] The apparatus 10 further includes a processor 54 which is communicatively coupled to the obtaining unit and serves as a control unit of the apparatus 10. The processor 54 is shown in FIGS. 17 and 18.

[0134] The processor 54 is configured to control one or more of a number of scanning parameters of the scanning arrangement based on the data obtained by the obtaining unit, and to generate the x-ray image of the subject 26 which can, for instance, be viewed by an operator of the apparatus 10.

[0135] The scanning parameters controllable by the processor 54 are the following: [0136] the rate at which the scanning arrangement moves relative to the subject, i.e. a scanning rate; [0137] the voltage of an x-ray tube being used; [0138] the current of the x-ray tube being used; [0139] the distance between the energy emitting source 20 and the subject 26; and/or [0140] the type of x-ray filter used.

[0141] The processor 54 further provides the functionality of an interlock unit in order to enable a so-called hard interlock configuration. The processor 54 is communicatively coupled to a magnetic locking mechanism (not shown) and a position sensor (not shown) associated with each door 16, 18. In use, the processor 54 designates both doors 16, 18 as normally unlocked and, in response to sensing by means of one of the position sensors that one of the doors 16, 18 has been opened, the processor 54 transmits a locking signal to the locking mechanism of the other one of the doors 16, 18. Furthermore, when scanning is in progress, the processor 54 transmits locking signals to the locking mechanisms of both doors 16, 18 to ensure that the doors 16, 18 remain closed during scanning.

[0142] The apparatus 10 includes a displacing arrangement 36 for displacing the scanning arrangement 20, 22 along a vertical axis of the apparatus 10 in a scanning direction (and thus along the length of the subject 26, in use). In this embodiment, the displacing arrangement 36 includes a belt-and-pulley drive arrangement comprising horizontal and vertical drive belts drivingly connected to pulleys. The belt-and-pulley drive arrangement is disposed adjacent to the scanning zone 24, partially surrounding it, in a U-shaped configuration, various portions of which are illustrated in FIGS. 5 to 14. The apparatus 10 is thus devoid of a conventional C-arm connection for mechanically connecting a source and detector. Instead, the source 20 and the detector 22 are collectively moved upwardly and downwardly relative to the housing 12 along the vertical axis by way of the horizontal and vertical drive belts and pulleys, in use.

[0143] The displacing arrangement 36 includes a motor 38 which drives a pair of horizontal drive belts 40, which in turn are drivingly connected to drive pulleys 42.1, which are arranged to displace the source 20 and the detector 22 relative to the housing 12 in the scanning direction by way of pairs of vertical drive belts 41 and pulleys 42.2, 42.3. Specifically, the source 20 is secured to a set of transversely spaced apart vertically extending belts 41 on one side of the scanning zone 24 whilst the detector 22 is secured to another opposing set of transversely spaced apart, vertically extending belts 41 on the other side of the scanning zone 24. On each side of the scanning zone 24, a lower set of pulleys 42.2 and an upper set of pulleys 42.3 are drivingly connected by transversely extending shafts 44, best shown in FIGS. 5 and 7. The motor 38 and horizontal drive belts 40 are located below the platform 34 and the displacing arrangement 36 thus does not restrict or impede linear movement of the subject 26 through the apparatus 10, as may be the case in conventional C-arm arrangements where subjects may be required to travel along a path which includes a 180 degree turn.

[0144] The displacing arrangement 36 is configured to ensure that the source 20 and the detector 22 remain aligned or in register in the horizontal plane as they move upwardly or downwardly along the vertical axis during the imaging process.

[0145] In order to ensure simultaneous upward or downward displacement of the source 20 and detector 22 relative to the housing 12, each of the source 20 and detector 22 are secured to the set of vertical drive belts 41 by way of an attachment formation 43 (see FIGS. 10 and 13) which clamps onto the respective vertical drive belts 41 at the same height and side thereof. Therefore, as the horizontal drive belts 40 are displaced by the motor 38, the scanning arrangement rises or falls together with one side of the vertical drive belts 41. In order to increase stability of the scanning arrangement whilst being displaced relative to the housing 12, a linear bearing 45 is provided in each corner, adjacent to each vertical drive belt 41. The source 20 and detector 22 both have a pair of linear bearing followers 46 which operatively slide up and down along the bearings 45 to ensure linear movement of the scanning arrangement.

[0146] In use, while the subject 26 stands in the apparatus 10 (see FIG. 3), the obtaining unit analyses the body of the subject 26 (i.e. captures an image thereof) to determine its variable composition and the processor 54 then controls/adapts one or more of the scanning parameters based on the composition of a region of the body of the subject to be scanned at a particular point in time in order to facilitate the generation of an image of predetermined quality or resolution, while minimising scanning time.

[0147] Scanning then commences, i.e. the scanning arrangement carries out x-ray scanning on the subject 26 by irradiating the subject 26, using the energy emitting source 20 to emit the x-ray beam 28 from one side of the scanning zone 24, through the subject 26, to the other side and detects or receives the emitted beam 28 using the detector 22 positioned on the other side of the scanning zone 24 while the source 20 and detector 22 are collectively moving vertically relative to the housing 12 along the vertical axis through actuation of the motor 38 of the displacing arrangement 36.

[0148] For instance, one of the scanning parameters may be adapted by scanning the legs 47 of the subject 26 at a relatively high speed, while the thorax and abdomen region 49, where higher x-ray penetration is required, is scanned at a lower speed. As a result, a subject having larger abdominal and thoracic dimensions than another subject will cause scanning to be carried out at a lower speed through the abdominal region than the speed required for the other subject, in order to achieve the required penetration and desired quality of imaging.

[0149] The processor 54 may also vary one or more scanning parameters, i.e. the voltage and/or current and/or x-ray filter of the scanning arrangement in accordance with variances in the composition of the body of the subject 26. For instance, the apparatus 10 may scan the thorax and abdomen 49 of the subject 26 using a higher voltage than for the rest of the body of the subject 26. Also, if the subject 26 has a relatively large thorax and abdomen, a higher voltage may be used than a voltage used for a subject with a smaller thorax and abdomen.

[0150] The distance between the source 20 and the subject 26 may also be adjusted based on the composition of the body of the subject 26 in order to generate a suitable image.

[0151] The apparatus 10 may select one or more x-ray filters (not shown) for the purpose of differentiation between materials consisting of different atomic numbers or optimally adjusting the filtration scanning parameter for the specific size subject and/or the type of object scanning i.e. for narcotics, explosives precious metals or stones.

[0152] A further feature of the apparatus 10, in this embodiment, is that it is configured to permit a certain region of the body of the subject 26 to be rescanned after an initial scan. User input is received from an operator of the apparatus 10 after the operator has viewed the first image generated by the apparatus 10, indicating a selected region in respect of which rescanning is required. The apparatus 10 is configured, in response to receiving the user input, to rescan the selected region using the scanning arrangement 20, 22.

[0153] In this example, the selected region is rescanned using an adjusted scanning parameter. Any of the scanning parameters referred to above may be adjusted when rescanning the selected region. For instance, the selected region may be rescanned at a relatively lower speed than a speed at which the selected region was previously scanned, thereby increasing penetration and producing a better image of the selected region only, and thus also serving to minimise scanning time and additional radiation received by the subject 26.

[0154] The apparatus 10 further includes an Uninterrupted Power Supply (UPS) 52, which is shown in FIGS. 17 and 18. The UPS 52 is coupled to the processor 54 and obtaining unit and is specifically configured to prevent the use of the apparatus 10 if sufficient power cannot be provided by the UPS 52 for the completion of the imaging of a subject, e.g. in case mains power supply is disconnected or interrupted and less than sufficient power remains in the UPS 52.

[0155] The Inventors envisage that various further features may be incorporated into embodiments of the invention, including: [0156] The imaging apparatus may include a plurality of implicit biometric identification means. [0157] The imaging apparatus may provide for the integration of ID readers by means of an ID Reader System Development Kit that may facilitate the development of customised ID reader interfaces by third parties without direct involvement from a manufacturer, distributor or supplier. [0158] The imaging apparatus may be communicatively coupled to other devices via the Internet and/or the Internet of Things. The Internet of Things may facilitate the interconnection, via the Internet, of computing devices, e.g. devices embedded in everyday objects, thereby enabling them to send and receive data. To this end, the imaging apparatus may include any suitable communication module permitting such communication. [0159] The imaging apparatus may interact with other devices for the purpose of leasing or renting the imaging apparatus, e.g. on a per transaction basis. Distributed ledger technology in conjunction with blockchain technology may be utilised in this regard. It is envisaged that this may vastly reduce transaction fees associated with the leasing or renting of the imaging apparatus. [0160] The imaging apparatus may be communicatively coupled to a cloud-based database, wherein the database allows for the use and integration of any one or more of biometric identification means, images and radiation exposure data, thereby enabling the parameters of the imaging of a subject to incorporate the data of the combined effect of a plurality of subjects, check-points and/or scanning apparatuses within multiple geographic areas. [0161] It will be appreciated that various configurations of off-site data collection systems may be utilised in embodiments of the invention. [0162] A website may be provided by which one or more of the abovementioned aspects may be accessed and/or controlled and/or facilitated. For instance, the website may permit renting or leasing of the imaging apparatus and may employ blockchain technology, e.g. cryptocurrency payments. [0163] In some embodiments, radio isotopes may be utilised as the source (e.g. the source 20) of the imaging apparatus.

[0164] An apparatus according to embodiments of the invention may be installed in a site such as, but not limited to, an airport or mine. For example, the apparatus 10 may be installed close to an entry to a secure area, such as an aeroplane itself. The apparatus 10 may be located distal the terminal, but proximal the aeroplane, e.g. at a passenger boarding bridge.

[0165] A first example of a screening arrangement 60 according to the invention is shown in FIG. 19. The screening arrangement 60 includes the imaging apparatus 10 as described with reference to FIGS. 1 to 18 and also includes two modular holding rooms 62, 64 attached to the apparatus 10. The holding rooms 62, 64 and the apparatus 10 are thus integral and can be deployed as a unit.

[0166] The holding room 62 has an entrance door 68 and an exit door 70 and the holding room 64 also has an entrance door 72 and an exit door 74. An enclosed intermediate zone 76 is defined between the apparatus 10 and the holding rooms 62, 64.

[0167] The screening arrangement 60 can typically be positioned at a boundary between an unscreened area and a screened area (or at some other transition from an unscreened area to a screened area) such that subjects are required to travel through the scanning zone 24 of the apparatus 10 in order to move from the unscreened area to the screened area. For instance, the unscreened area may be a public area of an airport and the screened area may be a so-called sterile area of the airport.

[0168] In the screening arrangement 60 of FIG. 19, the holding room 62 is a primary holding room and the holding room 64 is a secondary holding room, arranged in parallel with the holding room 62. The linear path described above (i.e. the straight line of travel which includes entering the scanning zone 24 via the door 16 and exiting the scanning zone 24 via the door 18) in this case includes entering and exiting the primary holding room 62. The door 18 is arranged such that it leads into the entrance door 68 of the holding room 62. The secondary holding room 64 may be used for further screening or interrogation, ensuring substantially uninterrupted flow along the linear path through the apparatus 10 and the holding room 62.

[0169] For example, the subject 26 may enter the apparatus 10 via the door 16, be scanned in the scanning zone 24, exit the apparatus 10 via the door 18, enter the holding room 62 via the door 68 and exit the holding room 62 via the door 70. Another subject may be scanned in the scanning zone 24 while the subject 26 is held in the holding room 62 (possibly while a further subject is held in the holding room 64).

[0170] A further example of a screening arrangement 80 is shown in FIGS. 20 and 21. The screening arrangement 80 is provided by two of the screening arrangements 60 of FIG. 20 arranged in a side-by-side manner.

[0171] FIG. 22 shows an example of the manner in which the screening arrangement 60 of FIG. 19 may be manufactured in a movable container 90 so as to form a container unit. The container 90 has a rectangularly cuboidal shape defined by sidewalls 92.

[0172] The apparatus 10 and the holding rooms 62, 64 are integral with the container 90. More specifically, a side of the apparatus 10 interrupts one of the sidewalls 92 of the container 92, while two of the sidewalls 92 of the container 90 define respective exterior sidewalls of the holding rooms 62, 64, as indicated by the reference numerals 92A and 92B in FIG. 22.

[0173] The container 90 defines an entry zone 94 from where a subject can enter the apparatus 10. The container 90 further defines an exit zone 96 from where the subject can leave one of the holding rooms 62, 64 and exit the container 90.

[0174] The imaging apparatus and/or holding room(s) and/or container described herein may be provided in kit form for deployment at a desired facility. A conventional container, such as a shipping container, may be used and the apparatus 10 and/or one or more holding rooms may be included therein, as shown in FIG. 22, to form a container unit.

[0175] The Inventors believe that embodiments of the present invention provide numerous advantages.

[0176] The Inventors have found that the imaging apparatus may have a relatively small footprint, making it relatively easy to install and/or reposition. The apparatus and/or the use of modular holding rooms may assist in optimising the use of floor space.

[0177] Furthermore, the displacing arrangement as described herein may facilitate the reduction in dimensions of an imaging apparatus and/or may facilitate or optimise passage of a subject in or through the apparatus and a screening arrangement. Specifically, the imaging apparatus is devoid of a C-arm, enabling the subject to travel in a straight line through the apparatus. The displacing arrangement 36 is disposed in a U-shaped configuration around the scanning zone 24 in such a way that it does not impede or restrict movement of the subject through the scanning zone 24.

[0178] The imaging apparatus may be manufactured in a standard shipping container, enabling rapid deployment and/or re-deployment of the apparatus. In the Inventors' experience, typically, an imaging apparatus is installed on site as a first step, after which holding rooms and/or other extras are added in one or more further steps. Contrastingly, in embodiments of the present invention, the imaging apparatus and holding room(s) (and optionally also a container) form a unit and can thus be deployed to a site simultaneously. The use of a screening arrangement as described herein will thus obviate the need for civil, mechanical, electrical and/or instrumentational contractors to provide additional functionality after an initial installation.

[0179] Furthermore, in embodiments as described herein, if a particular subject is identified for further screening, questioning, or the like, the flow of subjects through the screening arrangement is not interrupted or restricted (or is minimally interrupted or restricted).

[0180] The Inventors also believe that features such as the interlock unit and cameras installed in the apparatus may provide enhanced security.

[0181] The Inventors have found that the configuration of the apparatus as described herein may reduce peripheral or scatter radiation as a result of the seal provided by the housing. The housing may also dampen noise generated by components of the imaging apparatus, such as the displacing arrangement.

[0182] It should be appreciated that the imaging apparatus described herein may typically be configured to be used in relatively low dosage applications, as opposed to certain medical applications with significantly higher relative dosages. Specifically, the imaging apparatus may be configured to expose the subject to an effective radiation dose in the region of 15 micro Sievert (Sv) or less, per scan. In some implementations, this effective radiation dose may be in the region of 100 nSv or less, per scan.