[Usefulness of Copper Filter Addition and Potential for Dose Reduction in Hip-joint Radiography].

Nihon Hoshasen Gijutsu Gakkai zasshi Pub Date : 2024-10-20 Epub Date: 2024-09-07 DOI:10.6009/jjrt.2024-1445

Tomoyoshi Kawabata, Shoko Kamiyama, Shu Onodera

引用次数: 0

Abstract

Purpose: In this study, we evaluated image quality and radiation dose reduction when a Copper (Cu) filter was added to hip joint X-ray imaging.

Methods: We measured effective energy without (0 mm) and with (0.1/0.2 mm) Cu-added filter at 70 kV, and we calculated soft tissue-bone contrast and signal-difference-to-noise-ratio (SDNR) under constant entrance surface dose. After that, we estimated the dose reduction rate.

Results: The effective energy was 32.07 keV for 0 mm Cu, 37.59 keV for 0.1 mm Cu, and 40.91 keV for 0.2 mm Cu. As the thickness of the Cu-added filter was increased, contrast decreased, but SDNR increased. The dose reduction rate in bone calculated measuring SDNR was 34% for 0.1 mm Cu and 47% for 0.2 mm Cu in max.

Conclusion: It was suggested that adding Cu filter to hip-joint X-ray imaging could reduce entrance surface dose while maintaining the image quality based on SDNR.

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[在髋关节 X 射线照相术中添加铜滤波器的效用和降低剂量的潜力]。

目的：在这项研究中，我们评估了在髋关节 X 射线成像中添加铜（Cu）滤光片后的图像质量和辐射剂量降低情况：方法：我们测量了在 70 千伏电压下未添加（0 毫米）和添加（0.1/0.2 毫米）铜滤光片时的有效能量，并计算了在入口表面剂量恒定的情况下软组织-骨骼对比度和信号差-噪声比（SDNR）。之后，我们估算了剂量减少率：结果：0 毫米铜的有效能量为 32.07 keV，0.1 毫米铜的有效能量为 37.59 keV，0.2 毫米铜的有效能量为 40.91 keV。随着加铜滤光片厚度的增加，对比度降低，但 SDNR 增加。通过测量 SDNR 计算出的骨骼剂量减少率，最大值为 0.1 mm Cu 34%，0.2 mm Cu 47%：结论：在髋关节 X 射线成像中加入铜滤光片可减少入口表面剂量，同时根据 SDNR 保持图像质量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Nihon Hoshasen Gijutsu Gakkai zasshi

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