CRTイメージングカメラのMTFの測定
書誌事項
- タイトル別名
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- Measurement of MTF in a CRT Imaging Camera
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説明
We measured modulation transfer function (MTF) to evaluate the resolution property of a CRT imaging camera which is used as a hard-copy device in the digital imaging system. We examined the effects of various factors on MTFs, including the adjustment of CRT setting (contrast and brightness), the variation of division number on film, the variation of positions on CRT, and raster-erase technique. The hypothetical "slit" images for two orthogonal directions relative to the electron-beam scanning of the CRT were produced by use of digital subtraction angiography system. Then the MTFs were calculated from the Fourier transformation of the line spread function (LSF) derived from the hypothetical "slit" images. The MTF measured in the perpendicular direction to the electron-bea m scanning was greater than that obtained in the parallel direction. The MTFs determined in different positions on CRT indicated the variations of the values; these are mainly attributable to the changes of shape and size of the electron-beam spot. The MTF results measured by different conditions on CRT adjustment indicated that the higher contrast setting and the lower brightness setting showed the higher MTF values than another settings. We also indicated that the MTF was slightly decreased by rastererase technique. Two different methods, the neutral-density (ND) filter and brightness-meter methods, to measure the characteristic curie of a single-emulsion film for linearization were also examined, and showed in good agreement with each other. This means that the both methods are effective for sensitometry of the film.
収録刊行物
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- Medical Imaging and Information Sciences
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Medical Imaging and Information Sciences 8 (3), 77-85, 1991
Medical Imaging and Information Sciences
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詳細情報 詳細情報について
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- CRID
- 1390001205455335808
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- NII論文ID
- 130004988897
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- ISSN
- 09101543
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可