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학술저널
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연세대학교 의과대학 Yonsei Medical Journal Yonsei Medical Journal 제56권 제1호
발행연도
2015.1
수록면
253 - 261 (9page)

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Purpose: To investigate the optimal blending percentage of adaptive statistical iterativereconstruction (ASIR) in a reduced radiation dose while preserving a degreeof image quality and texture that is similar to that of standard-dose computed tomography (CT). Materials and Methods: The CT performance phantom was scanned with standard and dose reduction protocols including reduced mAs or kVp. Image quality parameters including noise, spatial, and low-contrast resolution,as well as image texture, were quantitatively evaluated after applying various blending percentages of ASIR. The optimal blending percentage of ASIR that preservedimage quality and texture compared to standard dose CT was investigated in each radiation dose reduction protocol. Results: As the percentage of ASIR increased,noise and spatial-resolution decreased, whereas low-contrast resolution increased. In the texture analysis, an increasing percentage of ASIR resulted in an increase of angular second moment, inverse difference moment, and correlation and in a decrease of contrast and entropy. The 20% and 40% dose reduction protocolswith 20% and 40% ASIR blending, respectively, resulted in an optimal qualityof images with preservation of the image texture. Conclusion: Blending the 40% ASIR to the 40% reduced tube-current product can maximize radiation dose reduction and preserve adequate image quality and texture.

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