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Relative object detectability (ROD): a new metric for comparing x-ray imagedetector performance for a specified object of interest

机译：相对物体可检测性（ROD）：一种用于比较X射线图像的新指标特定目标物体的探测器性能

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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.
机译：相对物体可检测性（ROD）通过以下比率来量化两个图像检测器对指定目标物体的相对性能：探测器的探测量子效率的积分除以该物体的频谱，再除以第二个探测器的光谱。比较了四种不同的检测器，即微血管荧光透视（MAF），Dexela 1207型（Dex）和Hamamatsu C10901D-40型（Ham）CMOS X射线检测器以及平板检测器（FPD）。计算了六对检测器的ROD：（1）Dex / FPD，（2）MAF / FPD，（3）Ham / FPD，（4）Dex / Ham，（5）MAF / Ham和（6）MAF /固定长度为5毫米，直径从50到600微米不等的实心球以及四个外径分别为0.4和0.5毫米，壁厚分别为0.1和0.15毫米的碘填充血管的Dex。对于各种检测器对，金属丝和球体的物镜被证明是物体尺寸的函数。对于小特征，所有其他检测器相对于FPD的ROD都远大于ROD，并且随着直径的增加，其ROD接近1.0。对于所有检测器对，模拟的填充碘的小血管的相对可检测性被认为与相同内径的血管壁厚度无关。在这项研究中，ROD具有潜力，可以作为评估给定成像任务的两个探测器的相对性能的有用指标。

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