| 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)
|
|---|
| Outline of Final Research Achievements |
The most important agenda of X-ray CT is its radiation dose. All CT manufactures are concentrating their effort to develop and refine iterative reconstruction methods (IR type reconstruction). By use of IR, it is claimed to achieve lower noise (i.e. lower dose) while maintaining high resolution. Many reports which are supportive to this view are incessantly published.
However, images by IR type method behave non-linearly. Ordinary image quality indexes presuppose linearity of image. Applying them to nonlinear images without extreme care will fall into serious errors. We developed proper measurement methods so that ordinary image quality indexes can be applicable to nonlinear images. Using our methods, we shed light on pitfalls of image quality measurement for nonlinear images. We have confirmed that there is no net gain of image quality at least for some type of IR method. Through our many lectures, our view is now shared to some extend by researchers in this field.
|
