| Budget Amount *help |
¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2012: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Outline of Final Research Achievements |
We have derived the approximated analytical relationship between MTF and NPS, and have confirmed that the accuracy of this relationship is rather high expect for the low and high spatial frequency region. We have devised the analytical expression of noise SD of each pixel in a CT image reconstructed by the filtered back projection method and the estimation method of the absorbed dose for each pixel from the successive difference of numbers of photons penetrating along each X-ray path line; their accuracies have been shown to be are relatively high through simulation and measurements. We also showed that the CT image noise in a soft tissue region with a sufficiently large size was almost normally distributed. Results of this study indicate that, under an ideal condition, the absorption dose for each pixel of a CT image can be estimated from its noise SD.
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