Department of Diagnostic Radiology, Graduate School of Biomedical and Health Science, Hiroshima University, 1-2-3 Kasumi, Minamiku, Hiroshima, 734-8551, Japan.
Center for Cause of Death Investigation Research, Graduate School of Biomedical and Health Science, Hiroshima University, 1-2-3 Kasumi, Minamiku, Hiroshima, 734-8551, Japan.
Sci Rep. 2022 Feb 14;12(1):2452. doi: 10.1038/s41598-022-06541-9.
We compared three-dimensional (3D) CT images of stabbing victims subjected to volume-rendering (VR) or global illumination-rendering (GIR), a new technique now available for the reconstruction of 3D CT images. It simulates the complete interactions of photons with the scanned object, thereby providing photorealistic images. The diagnostic value of the images was also compared with that of macroscopic photographs. We used postmortem 3D CT images of 14 stabbing victims who had undergone autopsy and CT studies. The 3D CT images were subjected to GIR or VR and the 3D effect and the smoothness of the skin surface were graded on a 5-point scale. We also compared the 3D CT images of 37 stab wounds with macroscopic photographs. The maximum diameter of the wounds was measured on VR and GIR images and compared with the diameter recorded at autopsy. The overall image-quality scores and the ability to assess the stab wounds were significantly better on GIR than VR images (median scores: VR = 3 vs GIR = 4, p < 0.01). The mean difference between the wound diameter measured on VR and GIR images and at autopsy were both 0.2 cm, respectively. For the assessment of stab wounds, 3D CT images subjected to GIR were superior to VR images. The diagnostic value of 3D CT GIR image was comparable to that of macroscopic photographs.
我们比较了三维（3D）CT 图像的刺伤受害者进行体积渲染（VR）或全局光照渲染（GIR），一种新的技术现在可用于重建三维 CT 图像。它模拟了光子与扫描物体的完全相互作用，从而提供了逼真的图像。还比较了图像的诊断价值与宏观照片。我们使用 14 例经过尸检和 CT 研究的刺伤受害者的死后三维 CT 图像。三维 CT 图像进行 GIR 或 VR，三维效果和皮肤表面的光滑度进行 5 分制评分。我们还比较了 37 个刺伤伤口的三维 CT 图像与宏观照片。在 VR 和 GIR 图像上测量伤口的最大直径，并与尸检记录的直径进行比较。GIR 的整体图像质量评分和评估刺伤的能力明显优于 VR 图像（中位数评分：VR=3 对 GIR=4，p<0.01）。在 VR 和 GIR 图像上测量的伤口直径与尸检之间的平均差异均为 0.2cm。对于刺伤的评估，GIR 处理的三维 CT 图像优于 VR 图像。三维 CT GIR 图像的诊断价值与宏观照片相当。
