Telemedicine and online conference systems have some benefits so that equalizing medical level, improving efficiency of medical care and improving service for patients. It is possible to give advice and to support its medical projects stationed in other facility and to provide the same quality treatments for patients. In this paper, we set up a experimental network system to teleconference using JGN (Japan Gigabit Network)and tried to discussion alternatively for case study between Kanazawa university and Fukui red cross hospital,70 km away. The JGN used in this study is an ultra-highspeed network for the purpose of research and development. Kanazawa university, and Fukui red cross hospital are connected by a 10 Mbps communication link of the JGN. We tried online conference on the experimental network using video chat system. In result, using video chat system, the average transmission rate of MRI images (256 x 256pixel,16bit) is 0.2 s/flame.

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In the CT image system, we revealed the relationship between line spread function (LSF), or slice sensitivity profile (SSP), and point spread function (PSF). In the system, the following equation has been reported; I(x, y) = 0(x, y)** PSF(x, y), in which I(x, y) and 0(x, y) are CT image and object function, respectively, and ** is 2-dimensional convolution. In the same way, the following 3-dimensional expression applies; I' (x, y, z) = 0' (x, y, z) * * * PSF' (x, y, z), in which z-axis is the direction perpendicular to the x/y-scan plane. We defined that the CT image system was separable, when the above two equations could be transformed into following equations; I(x, y) = [0(x, y)*LSF(x)]* LSFy(y) and I' (x, y, z) = [0' (x, y, z) * SSP(z)]** PSF(x, y), respectively, in which LSF(x) and LSF, (y) are LSFs in x- and y-direction, respectively. Previous reports for the LSF and SSP are considered to assume the separable-system. Under the condition of separable-system, we derived following equations; PSF (x, y) = LSF, (x)LSFy(y) and PSF' (x, y, z) = PSF(x, y) SSP(z). They were validated by the computersimulations. When the study based on 1-dimensional functions of LSF and SSP are expanded to that based on 2- or 3-dimensional functions of PSF, derived equations must be required.

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