Validation of a Saliency Map for Assessing Image Quality in Nuclear Medicine: Experimental Study Outcomes
Validation of a Saliency Map for Assessing Image Quality in Nuclear Medicine: Experimental Study Outcomes
复制标题
DOI：
10.3390/radiation2030018
复制
发表时间：
2022-07
期刊：
影响因子：
--
通讯作者：
S. Hosokawa;Yasuyuki Takahashi;Kazumasa Inoue;Chimo Nagasawa;Yuya Watanabe;Hiroki Yamamoto;M. Fukushi-M.
中科院分区：
文献类型：
--
作者：
S. Hosokawa;Yasuyuki Takahashi;Kazumasa Inoue;Chimo Nagasawa;Yuya Watanabe;Hiroki Yamamoto;M. Fukushi-M.
近年来，利用显著性图来评价核医学图像的图像质量已有报道。然而，该研究只比较了定性的视觉评估，而没有进行定量评估。这项研究的目的是证明使用显著性图（从强度和闪烁计算）来评估核医学图像质量的可能性，通过对比评估者从眼动追踪设备获得的凝视数据。通过改变热球的位置、成像时间和迭代重建中的迭代次数，我们获得了972张正电子发射断层成像图像。计算每张图像计算的显著性图与评价者在图像呈现过程中的注视数据之间的Pearson相关系数。显著性图（强度）与评估者凝视数据之间存在强相关（r≥0.94）。这种趋势也观察到从临床设备获得的图像。在较短的采集时间内，迭代重建过程中迭代次数较少的图像对热球位置的注视更高。然而，当获取时间增加时，迭代没有发现差异。虽然与凝视图像相比，闪烁显着性的提高速度较慢，但无需预处理，可以应用于临床图像。
Recently, the use of saliency maps to evaluate the image quality of nuclear medicine images has been reported. However, that study only compared qualitative visual evaluations and did not perform a quantitative assessment. The study’s aim was to demonstrate the possibility of using saliency maps (calculated from intensity and flicker) to assess nuclear medicine image quality by comparison with the evaluator’s gaze data obtained from an eye-tracking device. We created 972 positron emission tomography images by changing the position of the hot sphere, imaging time, and number of iterations in the iterative reconstructions. Pearson’s correlation coefficient between the saliency map calculated from each image and the evaluator’s gaze data during image presentation was calculated. A strong correlation (r ≥ 0.94) was observed between the saliency map (intensity) and the evaluator’s gaze data. This trend was also observed in images obtained from a clinical device. For short acquisition times, the gaze to the hot sphere position was higher for images with fewer iterations during the iterative reconstruction. However, no differences in iterations were found when the acquisition time increased. Saliency by flicker could be applied to clinical images without preprocessing, although compared with the gaze image, it increased slowly.