Apparatuses are provided for evaluating an image quality of an image produced by an x-ray computed tomography (CT) system.

A method of creating a representation of the internal structure of a target object is provided. There is provided a method of creating a representation of the internal structure of a target object having the steps of accelerating a number of charged subatomic particles, guiding the particles to a plurality of emission sources on one side of a target object, emitting electromagnetic radiation from each specific emission source for a discrete period such that, during the discrete period, the specific emission source is associated with the discrete period, the electromagnetic radiation being generated by the conversion of the particles to electromagnetic radiation, detecting, on a side opposing the emission sources, a projection of penetration of the electromagnetic radiation from each emission source, and combining the projections from each source to create a representation of the internal structure of the target object.

A tomographic imaging apparatus includes an X-ray detector comprising a plurality of dual mode pixels and configured to detect radiation that has passed through an object, and at least one processor configured to obtain scan data from the X-ray detector, and control each pixel of the plurality of dual mode pixels to operate in one of a first mode and a second mode, wherein each pixel of the plurality of dual mode pixels includes a sensor configured to generate a scan signal by converting incident radiation into an electric signal, a first signal path circuit configured to transmit the scan signal in the first mode, a second signal path circuit configured to transmit the scan signal in the second mode, and a photon counter configured to count photons from the scan signal transmitted through one of the first and second signal path circuits.

A diagnostic system for monitoring a status of a CT system includes at least one radiation detector configured to monitor a CT component and generate signals representing measurement data associated with the CT component. The system also includes a diagnostic computer device in communication with the detector. The device is configured to receive an electrical signal from the detector and identify a first frequency in the electrical signal. The device is also configured to compare the first frequency in the electrical signal to a first reference frequency stored in memory. The first reference frequency is at least partially indicative of a first mechanical status of the CT component. The device is further configured to determine that the first frequency in the electrical signal is substantially similar to the first reference frequency and, in response, determine that the CT system has the first mechanical status.

An X-ray inspection system for scanning items is provided. The system includes: a stationary X-ray source extending around a rectangular scanning volume, and defining multiple source points from which X-rays can be directed through the scanning volume; an X-ray detector array also extending around the rectangular scanning volume and arranged to detect X-rays from the source points which have passed through the scanning volume; a conveyor arranged to convey the items through the scanning volume; and at least one processor for processing the detected X-rays to produce scanning images of the items.

Embodiments of the present invention provide a trailed multiple-viewing-angle item inspection system and method of operating the same. The inspection system includes: a trailer vehicle, a radiation inspection device, a power supply device and a power grid connection device. The trailer vehicle is mounted with a power supply chamber within which a power supply device and a power grid connection device are mounted and an inspection chamber within which a radiation inspection device is mounted. The radiation inspection device includes: ray radiation source configured to emit X-rays from various positions, detectors, a body frame, a transfer device, a data and image process system and a display and operation device. The trailed multiple-viewing-angle item inspection system of the present invention can obtain a transmission image containing depth information of an item by its one pass through the device, and achieve a high-speed inspection, a good image quality and a high inspection efficiency of hazardous articles, and its flexibility and movability can meet requirements in various working conditions.

The invention discloses a scanning method and apparatus suitable for scanning a pipeline or process vessel in which a beam of gamma radiation from a source is emitted through the vessel to be detected by an array of detectors which are each collimated to detect radiation over a narrow angle relative to the width of the emitted radiation beam.

The disclosure provides a scanning imaging system for security inspection of an object and an imaging method thereof, the system comprising: a conveying unit configured for bringing the object to move along a conveying direction; a plurality of radiographic sources at one side of the conveying unit, being arranged successively in a direction vertical to a plane, in which the conveying unit is located, and configured for alternately emitting ray beams to form a scanning area; a linear detector array at the other side of the conveying unit, being configured for detecting first projection images, which are formed after the ray beams emitted by the plurality of radiographic sources penetrate through the object, in the process of the object passing through the scanning area; an imaging unit configured for obtaining a first reconstructed image of the object based on the first projection images of the plurality of radiographic sources.

An X-ray imaging inspection system for inspecting items comprises an X-ray source 10 extending around an imaging volume 16, and defining a plurality of source points 14 from which X-rays can be directed through the imaging volume. An X-ray detector array 12 also extends around the imaging volume 16 and is arranged to detect X-rays from the source points which have passed through the imaging volume, and to produce output signals dependent on the detected X-rays. A conveyor 20 is arranged to convey the items through the imaging volume 16.

At least one emitter formed of an electron emissive material is positioned on a cathode assembly and is readily and reliably connected to at least one mounting member of the cathode assembly. The connections between the at least one emitter and an emitter support structure are formed directly between the at least one emitter and the emitter support structure by utilizing the at one mounting member on the emitter support structure that are positioned adjacent the at least one emitter and heated to secure the at least one emitter to the emitter support structure by welding the at least one mounting member to the at least one emitter and emitter support structure.