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Performance Evaluation on HiSpeed Advantage RP

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Summary

We evaluated the performance of HiSpeed Advantage RP with regards to some of the provisions which the Japanese Committee on Performance Evaluation of X$B!>(Jray CT scanners designated as the 2nd counsel. We also examined changes of CT values in various materials by various tube voltages (100, 120, 140 kv), the dimensional variance$B!>(Jthe influence of CT values by phantoms of all sizes, and the helical scanning efficiency to select the most suitable scanning conditions for diagnosis.
The results of this study were as follows :
  1. A tube voltage of 140 kv improved the signal to noise ratio and resolution as well as lightening the load of the X-ray tube. However the tube voltage worked against the linearity of the CT value.
  2. MTF showed that the Lung function, a high resolution function, was inappropriate for thin slice scanning, because it appeared much lower in the low frequency band compared to that of others.
  3. Dimensional variance of the CT value abated after using compensation software.
Key words:CT scanner, Performance, evaluation, technology

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  2. $B@lLg0Q0w2q(JX$B@~(JCT$BAuCV@-G=I>2A8!F$HI(J:$BF|J|5;3X;o(J. 46(1), 56$B!>(J63, (1991)
  3. $B2V0f9LB$(J, $BEDCg!!N4(J, $BB>(J:$B%i%;%s>u(JCT$B%9%-%c%sAuCV$K$*$1$k@-G=I>2A%U%!%s%H%`$K4X$9$k8&5f(J:$BF|J|5;3X;o(J,
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  4. $B>>ED9,9-(J, $BB>(J:Rapid kV Switching$BK!$K$h$k(JCT Dual Energy Scan$B$N8!F$(J$(2) $BF|J|5;3X;o(J. 47(6), 818$B!>(J824, (1991)
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