Exact(8)
To determine the interaction position, HEP uses SSDs, whose electrodes are subdivided into closely spaced strips.
We found that the center of gravity is well-correlated with the X-ray interaction position.
All of the events occurred in the scintillator were used to reconstruct the LUTs despite their X-Y interaction position.
To minimize the effect of multiple interactions and of noise, the interaction position was reconstructed separately on the two sides of the detector using the centroid method.
The tabulated values were used as look-up tables for determining the weight and interaction position in the crystal of the incoming photon.
Because the positioning algorithms determine the incidence position as opposed to the combination of interaction position and interaction depth, a very good parallax correction can be achieved.
Its motivation follows from the necessity of making it easier to derive fast algorithms for measuring the gamma detector interaction position.
We also notice that we can determine the X-ray interaction position of the split event with an accuracy better than 1/10 of the pixel size.
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