Singh V, Jain A, Bednarek D R, Rudin S
Toshiba Stoke and Vascular Research Center, University at Buffalo (SUNY), Clinical Translational Research Center, 8 floor, 875 Ellicott Street, Buffalo, NY 14203.
Proc SPIE Int Soc Opt Eng. 2014 Mar 19;9033:90335I. doi: 10.1117/12.2043504.
Relative object detectability (ROD) quantifies the relative performance of two image detectors for a specified object of interest by taking the following ratio: the integral of detective quantum efficiency of a detector weighted by the frequency spectrum of the object divided by that for a second detector. Four different detectors, namely the micro-angiographic fluoroscope (MAF), the Dexela Model 1207 (Dex) and Hamamatsu Model C10901D-40 (Ham) CMOS x-ray detectors, and a flat-panel detector (FPD) were compared. The ROD was calculated for six pairs of detectors: (1) Dex/FPD, (2) MAF/FPD, (3) Ham/FPD, (4) Dex/Ham, (5) MAF/Ham and (6) MAF/Dex for wires of 5 mm fixed length, solid spheres ranging in diameter from 50 to 600 microns, and four simulated iodine-filled blood vessels of outer diameters 0.4 and 0.5 mm, each with wall thicknesses of 0.1 and 0.15 mm. Marked variation of ROD for the wires and spheres is demonstrated as a function of object size for the various detector pairs. The ROD of all other detectors relative to the FPD was much greater than one for small features and approached 1.0 as the diameter increased. The relative detectability of simulated small iodine-filled blood vessels for all detector pairs was seen to be independent of the vessel wall thickness for the same inner diameter. In this study, the ROD is shown to have the potential to be a useful figure of merit to evaluate the relative performance of two detectors for a given imaging task.
相对目标可探测性（ROD）通过采用以下比率来量化两个图像探测器针对特定感兴趣目标的相对性能：探测器的探测量子效率积分，该积分由目标的频谱加权，再除以第二个探测器的相应积分。比较了四种不同的探测器，即微血管造影荧光镜（MAF）、Dexela 1207型（Dex）和滨松C10901D - 40型（Ham）CMOS X射线探测器以及平板探测器（FPD）。针对六对探测器计算了ROD：（1）Dex/FPD，（2）MAF/FPD，（3）Ham/FPD，（4）Dex/Ham，（5）MAF/Ham和（6）MAF/Dex，用于5毫米固定长度的金属丝、直径范围从50至600微米的实心球体以及四个外径分别为0.4毫米和0.5毫米、壁厚分别为0.1毫米和0.15毫米的模拟碘填充血管。对于各种探测器对，金属丝和球体的ROD随目标尺寸呈现出明显变化。对于小特征，所有其他探测器相对于FPD的ROD远大于1，并且随着直径增加接近1.0。对于相同内径的模拟小碘填充血管，所有探测器对的相对可探测性与血管壁厚无关。在本研究中，ROD显示出有可能成为评估两个探测器针对给定成像任务的相对性能的有用品质因数。
