Device matrix and location determination procedure and reaction time of gamma quanta and using the device to determine the location and reaction time of the gamma quanta in positron emission tomography

摘要

A device matrix determining the location and interaction time of gamma quanta, the device comprising a scintillation camera, wherein the camera (1) scintillant containing plates (8) scintillation constructed scintillator plastic preferably doped with atoms atomic number of at least 50, and that a surface of the plates (8) scintillation is configured to reflect photons incident on the surface from inside the scintillation camera according to an angle greater than the limit angle, and it comprises further photomultipliers (10) constituting rear sensing walls (10F, 10T, 10L, 10G, 10P, 10D) which record on each side (L, G, P, D) of the scintillation camera and the front (F) and ( T) of the camera scintillation light pulses emerging from the scintillation camera, and also because the resulting light pulses are conviertidos Sen signal power by a matrix of photomultipliers (10) forming the detector walls (10F, 10T, 10L, 10G, 10P, 10D) located between the plates (8) scintillation and device housing (2), in the photomultiplier (10) are fixed to a plate (11) assembly which is fixed to the housing that protects and maintains the entire device (2), wherein the device housing (2) is fixed to a frame (12 ) in which are embedded the plates (8) scintillation, and wherein the plate (11) assembly for supporting the photomultiplier (10) has a network of cut holes, whose size and shape matches the size and form of a housing of the photomultiplier (10), and wherein between the photomultiplier (10) and plates (8) scintillation layer (13) air is present, and wherein the device further comprises an electronic system configured to: - in the first stage of analysis, select T hose events for which the signals were recorded in at least three lateral layers (L, B, P, D) and anterior posterior layer (F) and (G) of the photomultiplier (10), - and then include in the further processing only those signals which occur within a time interval set, - and then determine the location of the reaction as in a plane (xy) of the plate (8) 25 scintillation three separate procedures: - based on the signal amplitude of the previous layers photomultiplier (10) (P) and rear (T), - based on the amplitudes of the signals from the layers of side photomultiplier (L, G, P, D), - and based on the time signal of the photomultiplier (10) from the previous layers (P) and rear (T) - and to take as a final result the weighted average with uncertainties appropriate measurement, - and to determine the depth of interaction as gamma (DOI) and LOR lines pa ra two quanta matching from the distribution of signal amplitudes in the photomultipliers in the side panels of the plates gamma, - and then define the point of annihilation along the LOR line based on the time signals from all photomultiplier, - and to provide a tomographic image from the set of LOR lines provided reconstructed and location of annihilation points along these lines.