G - Physics – 03 – B
Patent
G - Physics
03
B
358/11.1
G03B 42/02 (2006.01) A61B 6/00 (2006.01) A61B 6/03 (2006.01) H05G 1/08 (2006.01)
Patent
CA 1193764
29 ABSTRACT: In a rotary fan beam computed tomography appar- atus using recurrent relative displacement between the source and detectors (e.g. a deflected spot X-ray tube) for the recalibration of detectors in chain-like sequences across the detector array by successive pair-wise common- path sensitivity comparisons starting from a terminal detector, each sequence normally involves 30 or more suc- cessive comparisons, and consistent but unpredictable errors are found to occur, leading to incorrect Hounds- field values in the computed image matrix. The improve- ment comprises locating at least one radiation trans- parent detector of high stability in front of the array at an intermediate point and using the output to further correct the chain-corrected detector sensitivity values. One detector comprising a plastics scintillator optically coupled to a photomultiplier is described, whose output pulses are counter during a rotational scan and compared with the mean corresponding measurement from other detec- tors lying behind the one detector, to form a sensitivity ratio. From a corresponding ratio and data derived during calibration, a measured sensitivity value for the other detectors, is determined for each scan and is compared with the corresponding chain-corrected sensitivity value to generate a further sensitivity correction value which is then distributed among the detectors of the comparison sequence.
423793
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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