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Healthc Inform Res > Volume 9(3); 2003 > Article
Journal of Korean Society of Medical Informatics 2003;9(3):269-274.
DOI: https://doi.org/10.4258/jksmi.2003.9.3.269    Published online September 30, 2003.
Quantitative Assessment on Properties of LASER and CCD-based Film Digitizer
Won Suk Kang, Deog Kee Min, Haijo Jung, Sae Rome Kim, Hyung Sik Yoo, Hee Joung Kim
1BK21 Project for Medical Science, Yonsei University, Korea.
2Research Institute of Radiological Science, Yonsei University College of Medicine, Korea.
3Department of Radiology, Severance Hospital, Korea.

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 17x14 inches. Laser digitizer can provide relatively higher image quality, while CCD-based unit has the advantage of higher speed than laser unit.

Key Words: Laser Flim Digitizer, CCD Film Digitizer, Film Digitization, Image Quality
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