Patent ID: 7482593

Claim:
A method of determining a depth-of-interaction (DOI) function of a detector having a scintillation crystal and first and second photosensitive detectors arranged one at each opposite end face of the crystal for detecting scintillation interactions within the crystal, the method comprising the steps of: irradiating the crystal to provide a predetermined distribution of scintillation interactions along a depth axis of the crystal extending between the opposite end faces of the crystal; collecting a plurality of output signal pairs each including a first output signal associated with the first photosensitive detector and a second output signal associated with the second photosensitive detector, each collected output signal pair corresponding to a respective scintillation interaction at a specific DOI position z; calculating a signal ratio R for each of the plurality of output signal pairs, the signal ratio R representing a strength of the first output signal relative to the sum of the first and second output signals; and applying probability theory to the calculated signal ratios R to determine a cumulated distribution function CDF(R), the cumulated distribution function CDF(R) indicating DOI position z as a function of signal ratio R.