Radiant energy – Calibration or standardization methods
Patent
1998-09-09
2000-06-27
Hannaher, Constantine
Radiant energy
Calibration or standardization methods
25036307, 25036309, 25037011, 25037009, 25036305, 250369, G01T 1166
Patent
active
060809841
ABSTRACT:
A high-energy photon imaging system includes an imaging head, a signal processor, a data acquisition system and an image processing computer. The imaging head includes a detector that includes a plurality of closely-packed detection modules. Each detection module includes a plurality of detection elements mounted to a circuit carrier. The detection elements produce electrical pulses having amplitudes indicative of the magnitude of radiation absorbed by the detection elements. The circuit carrier includes channels for conditioning and processing the signals generated by corresponding detection elements and for preparing the processed signals for further processing by a signal processor. Each conditioning and processing channel stores the amplitudes of the detection element electrical pulses exceeding a predetermined threshold. The detection modules employ a fall-through circuit which automatically finds only those detection elements that have a stored pulse amplitude exceeding the threshold. The fall-through circuit searches for the next detection element and associated channel having a valid event. The signal processor performs diagnostics, gain normalization, and response efficiency normalization functions. The data acquisition system controls the acquisition and processing of data received from the conditioning and processing channels, produces image data based upon the data in a format that is compatible with existing imaging cameras, and transmits the data to the image processing computer. The image processing computer formulates images based upon the processed signals and displays the formulated images on a display device.
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Digirad Corporation
Hannaher Constantine
Israel Andrew
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