Measurement of the useful field of view for single slices of different imaging modalities and targets
Measurement of the useful field of view for single slices of different imaging modalities and targets
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DOI：
10.1117/1.jmi.7.2.022411
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发表时间：
2020-03-01
影响因子：
2.4
通讯作者：
Eckstein, Miguel P.
中科院分区：
文献类型：
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作者：
Lago, Miguel A.;Sechopoulos, Ioannis;Eckstein, Miguel P.
目的：随着三维 (3-D) 图像显示为 2-D 图像堆栈，放射科医生更加依赖远离注视点的视觉来视觉处理信息、引导眼球运动和检测异常。因此，检测远离固定点的目标的能力（通常被称为有用视场 (UFOV)）对于这些 3D 成像模式至关重要。我们研究了 UFOV（定义为偏心率，其中检测性能降低到给定概率）如何随成像方式和目标的变化而变化。方法：我们测量单切片肝脏计算机断层扫描 (CT)、二维数字乳房 X 光检查 (DM) 和单切片数字乳房断层合成 (DBT) 病例中距注视位置不同距离处不同目标的可检测性。具有不同专业知识的观察者被要求将目光保持在一个点上，同时图像的短暂显示会闪烁，并且眼动仪会验证观察者的稳定注视。 CT 图像的显示时间为 200 和 1000 毫秒，DM 和 DBT 图像的显示时间为 500 毫秒。结果：我们发现肝脏 CT 的 UFOV 变化为 9 至 12 度，而乳腺图像（DM 和 DBT）中钙化簇的 UFOV 小至 2.5 至 5 度。我们将我们的结果与文献中报道的肺结节结果进行比较，并讨论用于测量 UFOV 的方法之间的差异、它们对病例选择/任务难度、观察条件和观察者专业知识的依赖性。我们提出了一种根据相对于中心凹性能（相对 UFOV）的性能退化来定义的补充措施，以规避 UFOV 因病例选择/任务难度而变化的情况。结论：我们的结果突出了 UFOV 在成像模式、目标类型、观察者专业知识和测量方法方面的变化，并提出了一种额外的相对 UFOV 措施，以更全面地表征远离注视点的检测性能。 (C) 2020 年光电仪器工程师协会 (SPIE)
Purpose: With three-dimensional (3-D) images displayed as stacks of 2-D images, radiologists rely more heavily on vision away from their fixation point to visually process information, guide eye movements, and detect abnormalities. Thus the ability to detect targets away from the fixation point, commonly characterized as the useful field of view (UFOV), becomes critical for these 3-D imaging modalities. We investigate how the UFOV, defined as the eccentricity, in which detection performance degrades to a given probability, varies across imaging modalities and targets.Approach: We measure the detectability of different targets at various distances from gaze locations for single slices of liver computed tomography (CT), 2-D digital mammograms (DM), and single slices of digital breast tomosynthesis (DBT) cases. Observers with varying expertise were instructed to maintain their gaze at a point while a short display of the image was flashed and an eye tracker verified observer's steady fixation. Display times were 200 and 1000 ms for CT images and 500 ms for DM and DBT images.Results: We find variations in the UFOV from 9 to 12 deg for liver CT to as small as 2.5 to 5 deg for calcification clusters in breast images (DM and DBT). We compare our results to those reported in the literature for lung nodules and discuss the differences across methods used to measure the UFOV, their dependence on case selection/task difficulty, viewing conditions, and observer expertise. We propose a complementary measure defined in terms of performance degradation relative to the peak foveal performance (relative-UFOV) to circumvent UFOV' s variations with case selection/task difficulty.Conclusion: Our results highlight the variations in the UFOV across imaging modalities, target types, observer expertise, and measurement methods and suggest an additional relative-UFOV measure to more thoroughly characterize the detection performance away from point of fixation. (C) 2020 Society of Photo-Optical Instrumentation Engineers (SPIE)