Laser film digitizer: the next generation

Yoshiyuki Ishimitsu; Mitsuo Onuki; Kazuyuki Arai

doi:10.1117/12.18805

1 July 1990 Laser film digitizer: the next generation

Yoshiyuki Ishimitsu, Mitsuo Onuki, Kazuyuki Arai

Proceedings Volume 1231, Medical Imaging IV: Image Formation; (1990) https://doi.org/10.1117/12.18805
Event: Medical Imaging '90, 1990, Newport Beach, CA, United States

Abstract

We developed a new technique for the laser film digitizer using a photo diode and a special optical system with an elliptical mirror to replace a photo multiplier tube and optical fiber bundle combination. In order to maintain the highest possible signal-to-noise ratio with a photo diode, the noise problem due to the dark current had to be solved. The authors analyzed the characteristics of the dark current first, then determined the optimized laser beam power at the surface of the photo diode so that the highest signal-to-noise ratio can be kept. In order to realize this result, a new elliptical mirror system which boosted transmission efficiency from 5% to 70% was developed. In addition, the authors discuss the required features for the future laser film digitizers for radiological application.

Citation Download Citation

Yoshiyuki Ishimitsu, Mitsuo Onuki, and Kazuyuki Arai "Laser film digitizer: the next generation", Proc. SPIE 1231, Medical Imaging IV: Image Formation, (1 July 1990); https://doi.org/10.1117/12.18805

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