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

Tomoyoshi Kawabata, Shoko Kamiyama, Shu Onodera

Nihon Hoshasen Gijutsu Gakkai zasshi 2024 Oct 20

filter terms:

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

Citation

Tomoyoshi Kawabata, Shoko Kamiyama, Shu Onodera. Usefulness of Copper Filter Addition and Potential for Dose Reduction in Hip-joint Radiography]. Nihon Hoshasen Gijutsu Gakkai zasshi. 2024 Oct 20;80(10):1017-1025