장골 검출기를 이용한 장골 검사에서 3D 프린터로 제작한 구리 필터의 유용성 연구

• Published in: 방사선기술과학 Vol. 44; no. 6; pp. 607 - 613
• Main Authors: 김우영(Woo-Young Kim), 서현수(Hyun-Soo Seo), 한봉주(Bong-Ju Han), 윤명성(Myeong-Seong Yoon), 이영진(Young-Jin Lee)
• Format: Journal Article
• Language: Korean
• Published: 대한방사선과학회(구 대한방사선기술학회) 30.12.2021; KOREAN SOCIETY OF RADIOLOGICAL TECHNOLOGY; 대한방사선과학회
• Subjects: 방사선과학; 3D Printer; 장골 검출기; CNR; Copper filament; 부가필터; Additional filter; 구리 필라멘트; 대조도 대 잡음비; SNR; Long-bone; Long length detector; 장골; 신호 대 잡음비; 3D 프린터; 3D
• ISSN: 2288-3509; 2384-1168

Long-bone examination is mainly used for inspection of the lower extremities. Recently, a long length detector (FXRD-1751S, VIEWORKS, Korea) with three digital detectors attached has been developed. High energy X-rays are used because pelvic areas require high image quality. In this case, X-rays are transmitted a lot in thin areas such as an ankle, and it is not suitable for diagnosing an image. Therefore, this study use copper filters made with 3D printers to increase image quality in the Long-bone inspection. A copper filter was manufactured in consideration of the overall thickness of the lower part. The experiment was conducted in anterior-posterior (AP) and lateral (LAT) positions, depending on the presence or absence of the filter. 5x5 pixels of region of interest (ROI) were selected from the pelvis, knee, and ankle areas. X-rays were irradiated under the conditions of 70 kVp and 40 mAs for AP, 80 kVp, and 63 mAs for lat when without filters, 90 kVp and 80 mAs for AP, 90 kVp and 100 mAs for lat when with filters. signal to noise ratio(SNR) ratio and contrast to noise (CNR) values were measured 1106.38, 14.34 before applying the filter and 1189.32, 70.43 after the filter. For the knee area, 650.44, 97.61 before applying the filter, and 1013.17, 444.24 after applying the filter. For the ankle area, 206.65, 23.68 before applying the filter and 993.50, 136.11 after applying the filter. In the Long-bone examination, SNR and CNR were greatly measured when the filter was applied, confirmed the availability of using the copper additional filter.