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HIGH-PRESSURE MULTIWIRE PROPORTIONAL AND GAS MICROSTRIP CHAMBERS FOR MEDICAL RADIOLOGY.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT.
(pp. 271 - 276).
ELSEVIER SCIENCE BV
Application of MultiWire Proportional Chambers (MWPC) and MicroStrip Gas Chambers (MSGC) in medical radiography is discussed. These detectors are capable of detecting X-rays in counting mode with high efficiency, thus giving essential dose reduction compared to film/screen techniques. This was demonstrated on several Digital Radiographic Devices (DRD) with one-dimensional MWPC and scanning in the orthogonal direction. Effective pixel sizes of 1 mm and 0.5 mm for different devices with highly parallel readout systems has been achieved. The counting rate capability of DRDs is similar to 500 kHz/pixel, which is enough to get high statistics of X-rays with a short exposure. Dose saving factors from 1 to 2 orders of magnitude for several common examinations were demonstrated.Further development of this approach can be made with MSGC which reproduce operation of MWPC in a much smaller scale. First tests of prototype chambers with 200 mu m pitch of strips at high pressure have shown the possibility to reach a gain of similar to 10(4) in a 6 bar Xe mixture. A proper choice of substrate material permits one to avoid charging problems at high fluxes. These features allow, one to build a counting device with 0.2 mm pixels for the detection of X-rays of 20-60 keV.
|Title:||HIGH-PRESSURE MULTIWIRE PROPORTIONAL AND GAS MICROSTRIP CHAMBERS FOR MEDICAL RADIOLOGY|
|Event:||Frontier Detectors for Frontier Physics of the 6th Pisa Meeting on Advanced Detectors|
|Location:||LA BIODOLA, ITALY|
|Dates:||1994-05-22 - 1994-05-28|
|UCL classification:||UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Engineering Science
UCL > School of BEAMS > Faculty of Maths and Physical Sciences
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