Medical Imaging and Information Sciences

VISUAL QUALITY ASPECTS IN SILVER HALIDE AND ELECTRONIC IMAGING SYSTEMS

Klaus Biedermann

1987 Volume 4 Issue 3 Pages 81-88
Published: 1987
Released on J-STAGE: August 27, 2012

DOIhttps://doi.org/10.11318/mii1984.4.81

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Lenses and photographic film have reached a high degree of technological maturity. The fast development of solid-state image sensor arrays indicates that electronic imaging systems may enter the field of traditional photography Further development of the two technologies and competition between them will be based on performance criteria. This review tries to present recent data, progress and unsettled problems in visual image quality assessment in AgBr photography, electronic still video photography and television.

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Resolution Property of a Digital Radiography with Photostimulable Phosphors I. Measurements of imaging Plate MTFs

Hiroshi FUJITA, Katsuhiko UEDA, Akiyoshi OHTSUKA

1987 Volume 4 Issue 3 Pages 89-94
Published: 1987
Released on J-STAGE: August 27, 2012

DOIhttps://doi.org/10.11318/mii1984.4.89

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For the optimal clinical performance of a digital radiographic system employing storage phosphors (imaging plates, IPs), it is important to be able to characterize the basic imaging properties of the system. Resolution property of the digital system is one of them. We devised a method to measure the modulation transfer function (MTF) of imaging plates by utilizing their property of "instantaneously emitted light". Conventional slit technique for screen/film systems was used to obtain the MTFs. The intensity of instantaneously emitted light from a standard type of IP (ST, Fuji Photo Film Co. ) was found to be approximately equal to the light intensity from medium-speed intensifying screens (BH-III). It was found that the MTF of ST was similar to that of medium-speed screen/film (BH-III/RX) system, and also that the MTF of high-resolution type of IP (HR) was superior to that of ST but inferior to that of high-resolution-type screen/film (Hi-mammo/MI-NC) system for mammography.

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Evaluation of Radiographic Effects of X-Ray Tube-Voltage Ripple-Rates a

Masao MATSUMOTO, Hitoshi KANAMORI

1987 Volume 4 Issue 3 Pages 95-100
Published: 1987
Released on J-STAGE: August 27, 2012

DOIhttps://doi.org/10.11318/mii1984.4.95

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An appreciable radiographic effect of the increase of a tube-voltage ripple-rate is the increase of a blur due to the motion of an object. This phenomenon is explained in terms of MTFs and information spectra. The advantage of three-phase units compared with single-phase units in the radiographic image quality is evaluated.

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Image Data Compression by Means of Arithmetic Coding

Seihaku HIGUCHI, Ryuhei TSUJI

1987 Volume 4 Issue 3 Pages 101-107
Published: 1987
Released on J-STAGE: August 27, 2012

DOIhttps://doi.org/10.11318/mii1984.4.101

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An arithmetic coding is well known as a powerful and an interesting technique from information theoretical viewpoints. For the practical use, however, some fundamental problems such as an error propagation and an adaptive scheme are remained to be settled. In order to apply this technique for the areas of image data compression, a simplified method for the computation of augend have to be developed.
In this paper, we present a feasible method by an introduction of a dummy symbol. Since we choose an occurrence probability of dummy symbol to be very small, we can avoid the loss of a total performance. A simple simulation study is carried out for the illustration of above method developed here.

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