Kelly W M, Brant-Zawadzki M, Schardt M A, Carrol C L
Neuroradiology. 1985;27(1):70-6. doi: 10.1007/BF00342520.
Twenty patients were studied with intra-arterial digital subtraction angiography (IA DSA), utilizing a 1024(2) matrix memory. Acquisition of the images was through a prototype television camera incorporating a finely focused electron beam. In five cases, comparison between a 512 X 512 (512(2)) matrix acquisition and a 1024 X 1024 (1024(2)) matrix acquisition mode was made, with injections occurring in the same vessel in the same patient. The clinical material demonstrated no significant improvement in image quality at the 4 1/2 as well as the 6 inch image intensifier (II) modes. However, the 1024(2) matrix combined with the 9 inch II mode showed foci of disease and normal anatomy with detail not always seen on the 9 inch II when a 512(2) matrix was used. In no case, however, was the basic diagnosis missed with the 512(2) matrix. Spatial resolution, as measured from lead bar test pattern images, demonstrated that the 1024(2) matrix allows a 70% or greater improvement in spatial resolution over the 512(2) for the 4 1/2, 6 and 9 inch II modes. For a given mode the radiation dose was held constant for the two matrix sizes.
对20名患者进行了动脉内数字减影血管造影（IA DSA）研究，采用1024(2)矩阵存储器。图像采集通过一台装有精细聚焦电子束的原型电视摄像机进行。在5例患者中，对512×512（512(2)）矩阵采集模式和1024×1024（1024(2)）矩阵采集模式进行了比较，注射均在同一患者的同一血管中进行。临床资料显示，在4.5英寸以及6英寸影像增强器（II）模式下，图像质量没有显著改善。然而，1024(2)矩阵与9英寸II模式相结合时，显示出病变部位和正常解剖结构的细节，而在使用512(2)矩阵时，9英寸II模式下并不总是能看到这些细节。然而，在任何情况下，512(2)矩阵都没有漏诊基本诊断。从铅条测试图案图像测量的空间分辨率表明，对于4.5英寸、6英寸和9英寸II模式，1024(2)矩阵的空间分辨率比512(2)矩阵提高了70%或更多。对于给定的模式，两种矩阵大小的辐射剂量保持恒定。
