An improved multicrystal 2-D BGO detector for PET

A simulation to model position encoding multicrystal PET detectors

“…With typically 1OpOOO counts per quadrant, this represents a 1% tolerance on the relative gain balance. The relationship between measured and true interaction positions is nonlinear in position encoding BGO block detectors [14], [15]. A lookup table is therefore necessary to relate a given (XT, Y,) pair to crystal matrix row and column addresses.…”

“…For these measurements, 51 1 keV photons from a 0.3 mCi point source of 68Ge were used in a benchtop setup described previously in [14]. Source and detector were separated by about 40 cm to produce a uniform flood of single photons at the block front face.…”

“…Such a lookup table was obtained with a high statistics run according to the procedure introduced in [14]. Crystal-bycrystal energy spectra were consequently derived from the same list-mode data.…”

The establishment of crystal position look-up table for positron emission tomography with block detectors

“…The overall ideas of them are to ascertain the boundary of each crystal element firstly, and then create the look-up table. Rogers et al [3] proposed a crystal identification method which finds the centroid rather than the peak of each small region on the histogram. The boundaries of crystal elements in a block are located at the valley between the centroids.…”

“…Up to now, several approaches [2][3][4][5][6] have been proposed to establish the look-up table using the 2-D position histogram. The overall ideas of them are to ascertain the boundary of each crystal element firstly, and then create the look-up table.…”