Patent ID: 7388209
Filing Date: 2008-06-17
Classification: G01V

Abstract:
1. A method for imaging a target comprising: directing radiation at the target; detecting at least a portion of the radiation that passes through the target at a detector array that includes at least one block detector having a two-dimensional sub-array of discrete detectors including multiple pixels and four photomultiplier tubes PMTs in a 2×2 array referenced individually as A, B, C and D and each of the four PMTs receives radiation from each of the multiple pixels; converting the detected radiation into multiple light signals using at least one scintillator; multiplying the multiple light signals using at least one photomultiplier tubes (PMT); shaping the multiplied light signals using at least one shaping amplifier; digitizing the shaped light signals using at least one analog-to-digital converter; processing the at least one digitized light signal to generate a density image of the target that is corrected for a parallax effect resulting from a configuration of the detector array; determining a trigger event by: collecting digitized light signals over a predetermined period of time; summing the digitized light signals collected; comparing the sum to a predetermined threshold; determining a trigger event if the sum is above the predetermined threshold; and detecting and holding a peak value for each of A, B, C and D for each determined trigger event.