Resolution Properties of a Digital Radiography with Photostimulable Phosphors. Measurements of Laser-Printer MTF III

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We measured the characteristic curve of a laser-beam sensitive film and display MTFs (Laser-printer MTFs) in an FCR-101 system. Laser-printer MTFs for two directions relative to the scan direction were measured by a "slit" method. The hypothetical "slit" image was produced by a personal computer and was output to the laser-beam sensitive film in a laser printer. Then the microdensitometer trace of the slit image was liniarized using the characteristic curve of the film, and the MTF was calculated from the Fourier transformation of the line spread function. The MTF measrured with the slit in the direction parallel to the laser scanning was greater than that obtained in the perpendicular direction. This is mainly related to the shape and size of the laser beam spot, i. e. display aperture. Moreover, we measured MTFs of the laser printer with new or old laser tubes, and also the "glare" of the laser printer. Results in our experimental conditions indicated that the effect of the laser tube on the MITF was negligible and the amount of the glare was also negligible.
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