레이저 방식 및 CCD 방식 필름 디지타이저의 정량적 특성 평가 및 비교분석

정해조; 민덕기; 김새롬; 강원석; 유형식; 김희중

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자료유형: 학술저널

저자정보: 정해조 민덕기 김새롬 강원석 유형식 김희중

저널정보: 대한의료정보학회 Healthcare Informatics Research Healthcare Informatics Research 제9권 제3호

발행연도: 2003.1

수록면: 1 - 15 (15page)

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Picture archiving and communication systems (PACS) has widely been used in many hospitals. Film digitizer has been used in order to create digital image file from conventional plain radiographic films for PACS. In this study, we quantitatively assessed the characteristics of film digitizer for both laser and CCD camera-based type used in Severance hospital.We created three test films to measure the quality of digitized images. The test films were then digitized by both laser and CCD camera-based film digitizer. Finally, the image files were transferred to the PC in which spatial resolution, contrast, and uniformity were evaluated. We also measured digitization time to evaluate the speed of digitizer. Modulation transfer function (MTF) was measured to evaluate the spatial resolution. Contrast was evaluated by measuring of useful range of optical density (OD). Contrast uniformity was calculated by the percentage of difference between minimum and maximum pixel values on the digitized images. Spatial resolution of laser digitizer was 5.0cycles/mm, while that of CCD-based unit was 1.5cycles/mm of spatial resolution at 10% of MTF. Useful range of OD for CCD unit was 77%, while that for laser unit was 100%. Contrast uniformities of laser unit were better than those of CCD-based unit. Digitization time was 10sec/film using CCD unit, and 60sec/film using LASER unit at film size of 17×14 inches. Laser digitizer can provide relatively higher image quality, while CCD-based unit has the advantage of higher speed than laser unit.

#Laser flim digitizer #CCD film digitizer #film digitization #Image quality

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