The investigated object containing a source of positrons is placed into a system of n position and energy-sensitive gamma radiation detectors (D.sub.i), each having detection elements (D.sub.ijk), where one of a pair of annihilation photons interacts in the detection element (D.sub.1jk) and the other interacts in another detection element (D.sub.2jk). The detectors store the coordinates of simultaneously affected detector elements, the time of interactions and the energies E.sub.1 and E.sub.2 of the annihilation photons. The recorded events in the detection elements (D.sub.1jk) and (D.sub.2jk) leads to recognition of individual pairs of annihilation photons. An analysis is performed of the registration of the photons by the detection elements (D.sub.1jk) and (D.sub.2jk) with energies in the interval from 507 keV to 513 keV to obtain an approximate spatial depiction of positions of positron annihilation and, registration of the photons from the positron annihilation with significantly Doppler shifted energies outside of that interval.

A particle beam system is configured to perform a method which includes: preventing at least one of generation of induced particles and incidence of the induced particles onto a detection area of a detector configured to output a detection signal; generating a residual signal by processing the detection signal outputted during the preventing using a control value; adjusting, based on the residual signal, the control value so that the residual signal takes a value within a predetermined limited residual-signal target range; directing a primary particle beam onto an object while allowing generation of the induced particles due to the primary particle beam and incidence of the induced particles onto the detection area; generating a result signal by processing the detection signal outputted during the directing using the control value.

A mask for use in compressed sensing of incoming radiation, the mask comprising: a body formed of a material that modulates an intensity of incoming radiation of interest. The body has a plurality of mask aperture regions, each comprising at least one mask aperture that allows a higher transmission of the radiation relative to other portions of the respective mask aperture region, the relative transmission being sufficient to allow reconstruction of the compressed sensing measurements; the mask has one or more axes of rotational symmetry with respect to the mask aperture regions; the mask apertures have a shape that provides symmetry after a rotation about the one or more axes of rotational symmetry; and mutual coherence of a sensing matrix generated by the rotation of the respective mask aperture regions is less than one. An imaging system for compressed sensing of incoming radiation comprising such a mask is also provided.

Techniques for sub-pixel resolution of an individual observation of ionizing radiation by electrode gerrymandering employ specialized pixel electrode geometries and a contracting-grid search to determine an energy deposition location and an estimate of the total deposited energy. Shaped pixel electrodes in a two-dimensional array of pixel electrodes enable redistribution of induced electrical signals to more than one pixel electrode by extending the pixel electrode's reach beyond that of a conventional pixel electrode so that an area or a portion of the pixel electrode is farther from its center than half a distance between its center and the pixel electrode center of an adjacent neighbor pixel electrode.

Disclosed herein is a method, comprising: for i=1, . . . , N, one by one, exposing a radiation detector to a radiation beam (i) thereby causing the radiation detector to capture a partial image (i) of the radiation beam (i), wherein N is an integer greater than 1; for i=1, . . . , N, determining, in the partial image (i), Mi pinpointing picture elements of a boundary image (i) of a boundary (i) of the radiation beam (i), wherein Mi is a positive integer; and stitching the partial images (i), i=1, . . . , N resulting in a combined image based on the Mi (i=1, . . . , N) pinpointing picture elements.

The present invention relates to a system for X-ray imaging It is explained to position (210) an X-ray detector (10) relative to an X-ray source such that at least a part of a region between the X-ray source and the X-ray detector is an examination region for accommodating an object. The X-ray source and X-ray detector are controlled (220) by a processing unit in order to: operate (230) in a first imaging operation mode; or operate (240) in a second imaging operation mode; or operate (250) in the first imaging mode and in the second imaging mode; or operate (260) in a third imaging operation mode. The detector comprises a first scintillator (20), a second scintillator (30), a first sensor array (40), and a second sensor array (50). The first sensor array is associated with the first scintillator. The first sensor array comprises an array of sensor elements configured to detect optical photons generated in the first scintillator. The second sensor array is associated with the second scintillator. The second sensor array comprises an array of sensor elements configured to detect optical photons generated in the second scintillator. The first scintillator is disposed over the second scintillator such that X-rays emitted from the X-ray source first encounter the first scintillator and then encounter the second scintillator. The first scintillator has a thickness equal to or greater than 0.6 mm. The second scintillator has a thickness equal to or greater than 1.1 mm. In the first imaging operation mode the first scintillator and the first sensor array are configured to provide data useable to generate a low energy X-ray image. In the second imaging operation mode the second scintillator and the second sensor array are configured to provide data useable to generate a high energy X-ray image. In the third imaging operation mode the first scintillator, the first sensor array, the second scintillator and the second sensor array are configured to provide data useable to generate a combined energy X-ray image.

Disclosed herein is a method, comprising: capturing portion images of scene portions (i), i=1, . . . , N of a scene with radiation detectors of an image sensor. For i=1, . . . , N, Qi portion images of the scene portion (i) are respectively captured by Qi radiation detectors of the P radiation detectors, Qi being an integer greater than 1. The Qi portion images are of the portion images. The method further includes, for i=1, . . . , N, generating an enhanced portion image (i) from the Qi portion images of the scene portion (i). Generating the enhanced portion image (i) is based on positions and orientations of the Qi radiation detectors with respect to the image sensor and displacements between Qi imaging positions of the scene with respect to the image sensor. The scene is at the Qi imaging positions when the Qi radiation detectors respectively capture the Qi portion images.

Techniques for imaging radioactive emission in a target volume include receiving data indicating a set of one or more known emission energies associated with a high energy particle source and determining a Compton line for each emission energy in the set. A Compton camera collects location and deposited energy from an interaction associated with a single source event from a target volume of a subject. For the single source event, an earliest deposited energy, E.sub.1, and first scattering angle, .sub.1, and a cone of possible locations for the source event are determined. A particular location for the high energy particle source within the target volume without including the single source event, if E.sub.1 is not within a predetermined interval of the Compton line for at least one of known emission energies. A solution is presented on a display device.

A radiation imaging apparatus comprises a radiation detection unit configured to convert received radiation into an electrical signal, a communication unit configured to perform wireless communication with an external device, and an exterior at least partially formed by a non-conductive member and configured to contain the radiation detection unit and the communication unit, wherein a conductor is formed so as to cover the radiation detection unit, and the communication unit is arranged between the exterior and the conductor.

A radiation imaging apparatus provided with a photon counting type detector for outputting an electric signal corresponding to energy of an incident radiation photon includes a measured value recording unit for measuring an attenuation value in the presence of a known calibration member while changing a threshold value of a detector output of the photon counting type detector and recording a measured value of the attenuation value for each threshold value of the detector output, a theoretical value calculation unit for calculating a theoretical value of the attenuation value in the presence of the calibration member with respect to multiple energies, a calibration information acquisition unit for acquiring a relation between the threshold value and the energy as calibration information by performing collation between the measured value and the theoretical value, and a calibration processing unit for converting the electric signal outputted from the photon counting type detector into energy.