【正文】
檢 測(cè) 器 A/D 數(shù)字圖象 計(jì)算機(jī) D/A 圖象獲取, 模擬信號(hào) Xray tube 膠片 傳統(tǒng)放射攝影 數(shù)字放射攝影 :a)模擬圖象數(shù)字化 ( 模擬檢測(cè)器 +A/D) b)直接數(shù)字成像 有賴(lài)于檢測(cè)器! 30 檢測(cè)器 Film(膠片 ), Image Intensifier (+ TV)(影象增強(qiáng)器) NaI + PMT(碘化鈉 +光電倍增管) Photo diode linear array(發(fā)光二極管線陣) Imaging plate(成像板 ): for CR for DR 31 BaFX crystal Substrate XRAY PHOTONS The image is recorded By qusistable crystal 633nm laser beam The laser beam converts the Xray latent image into visible image XRAY readout Convert to electric signal A/D digitalize How CR works? 32 light Remove the residue image The plate can be reused erase 33 。 Kev40?13 .. object detector scattering puter Scaning source object scattering detector Point sou