骨抑制软件在改善胸部 X 光片图像质量和降低辐射剂量方面的价值。

Value of bone suppression software in chest radiographs for improving image quality and reducing radiation dose.

机构信息

Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, 88 Olympic-ro 43-gil, Songpa-gu, Seoul, 05505, South Korea.

Division of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea.

出版信息

Eur Radiol. 2021 Jul;31(7):5160-5171. doi: 10.1007/s00330-020-07596-w. Epub 2021 Jan 13.

DOI:10.1007/s00330-020-07596-w

PMID:33439320

Abstract

OBJECTIVES

To compare image quality and radiation dose between dual-energy subtraction (DES)-based bone suppression images (D-BSIs) and software-based bone suppression images (S-BSIs).

METHODS

Chest radiographs (CXRs) of forty adult patients were obtained with the two X-ray devices, one with DES and one with bone suppression software. Three image quality metrics (relative mean absolute error (RMAE), peak signal-to-noise ratio (PSNR), and structural similarity index (SSIM)) between original CXR and BSI for each of D-BSI and S-SBI groups were calculated for each bone and soft tissue areas. Two readers rated the visual image quality for original CXR and BSI for each of D-BSI and S-SBI groups. The dose area product (DAP) values were recorded. Paired t test was used to compare the image quality and DAP values between D-BSI and S-BSI groups.

RESULTS

In bone areas, S-BSIs had better SSIM values than D-BSI (94.57 vs. 87.77) but worse RMAE and PSNR values (0.50 vs. 0.20; 20.93 vs. 34.37) (all p < 0.001). In soft tissue areas, S-BSIs had better SSIM values than D-BSI (97.56 vs. 91.42) but similar RMAE and PSNR values (0.29 vs. 0.27; 31.35 vs. 29.87) (all p < 0.001). Both readers gave S-BSIs significantly higher image quality scores than D-BSI (p < 0.001). The mean DAP in software-related images (0.98 dGy·cm) was significantly lower than that in the DES-related images (1.48 dGy·cm) (p < 0.001).

CONCLUSION

Bone suppression software significantly improved the image quality of bone suppression images with a relatively lower radiation dose, compared with dual-energy subtraction technique.

KEY POINTS

• Bone suppression software preserves structure similarity of soft tissues better than dual-energy subtraction technique in bone suppression images. • Bone suppression software achieves superior image quality for lung lesions than dual-energy subtraction technique in bone suppression images. • Bone suppression software can decrease the radiation dose over the hardware-based image processing technique.

摘要

目的

比较基于双能减影（DES）的骨抑制图像（D-BSI）和基于软件的骨抑制图像（S-BSI）的图像质量和辐射剂量。

方法

使用两种 X 射线设备（一种具有 DES，一种具有骨抑制软件）对 40 名成年患者进行胸部 X 线摄影（CXR）。对于 D-BSI 和 S-BSI 组的每个骨和软组织区域，计算原始 CXR 和 BSI 之间的三个图像质量指标（相对平均绝对误差（RMAE）、峰值信噪比（PSNR）和结构相似性指数（SSIM））。两位读者对 D-BSI 和 S-BSI 组的原始 CXR 和 BSI 的视觉图像质量进行了评分。记录剂量面积乘积（DAP）值。使用配对 t 检验比较 D-BSI 和 S-BSI 组之间的图像质量和 DAP 值。

结果

在骨区域，S-BSI 的 SSIM 值优于 D-BSI（94.57 比 87.77），但 RMAE 和 PSNR 值较差（0.50 比 0.20；20.93 比 34.37）（均 p<0.001）。在软组织区域，S-BSI 的 SSIM 值优于 D-BSI（97.56 比 91.42），但 RMAE 和 PSNR 值相似（0.29 比 0.27；31.35 比 29.87）（均 p<0.001）。两位读者均认为 S-BSI 的图像质量明显优于 D-BSI（p<0.001）。与 DES 相关图像（1.48 dGy·cm）相比，软件相关图像的平均 DAP（0.98 dGy·cm）显著降低（p<0.001）。