Halls S B
Department of Medical Imaging, Royal University Hospital, Saskatoon, Sask.
Can Assoc Radiol J. 1991 Dec;42(6):417-22.
A portable apparatus with rotating scanning slits has been designed to reduce scatter in the radiographs of obese patients. Rotating scanning slit radiography reduces scatter efficiently, but previous instruments with linear or curved slits have been too heavy to be portable. The author's "dart-board" pattern of multiple sector-shaped holes is theoretically efficient at reducing scatter, compensates for potential ring artifacts by overlapping the holes and expands the holes in the lower plate to account for penumbra. Computer simulation with Monte Carlo techniques shows that the new design is free of concentric ring artifacts. This design should improve the quality of radiographs of very obese patients.
一种带有旋转扫描狭缝的便携式仪器已被设计出来，以减少肥胖患者X光片中的散射。旋转扫描狭缝射线照相术能有效减少散射，但以前带有线性或弯曲狭缝的仪器太重，无法携带。作者的多个扇形孔的“飞镖靶”图案在理论上能有效减少散射，通过孔的重叠补偿潜在的环形伪影，并在下板中扩大孔以考虑半影。使用蒙特卡罗技术的计算机模拟表明，新设计没有同心环形伪影。这种设计应能提高极度肥胖患者X光片的质量。
