Schnakenberg B
Philips Medizin Systeme GmbH, Hamburg.
Radiol Diagn (Berl). 1990;31(4):317-38.
Advantages of digital radiography: Improved low contrast imaging; Image processing capability (on line or post-processing); Lower radiation dose for certain applications ("Dose variation"); Digital storage and data transfer; Only one exposure for different imaging characteristics; Optimised real-time image, "digital fluoroscopy" (DBR); Shorter examination times (DBR); Advantages for technically complicated exposures (intensive care, superpositions in the chest region, pediatry) (DLR); High dynamic range, which eliminates over or under exposure; Real time image processing and display (DBR). Disadvantages of digital radiography; Lower spatial resolution is limiting fine structure (max. theoretical resolution is 31p/mm for 1000 and app. 5 lp/mm for 2000 pixels image matrix); Spatial resolution depends from image intensifier diameter or screen format; Lower SNR (Signal to Noise Ratio) for reduced dose, increased noise impression for edge enhancement; Information losses for monitor camera (DBR) -hardcopies; Diagnostic capabilities are reduced by noise and low spatial resolution caused by certain applications (mammography).
改善低对比度成像；图像处理能力（在线或后处理）；某些应用中辐射剂量更低（“剂量变化”）；数字存储和数据传输；针对不同成像特性只需一次曝光；优化的实时图像，即“数字荧光透视”（DBR）；检查时间更短（DBR）；对技术复杂的曝光有优势（重症监护、胸部区域叠加、儿科）（DLR）；高动态范围，可消除曝光过度或不足；实时图像处理和显示（DBR）。数字放射成像的缺点：较低的空间分辨率限制了精细结构（对于1000像素图像矩阵，最大理论分辨率为31线对/毫米，对于2000像素图像矩阵约为5线对/毫米）；空间分辨率取决于图像增强器直径或屏幕格式；为降低剂量导致信噪比（SNR）降低，边缘增强时噪声感增加；监视器相机（DBR）硬拷贝存在信息损失；某些应用（乳腺摄影）产生的噪声和低空间分辨率会降低诊断能力。
