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大学・研究所にある論文を検索できる 「非造影下肢MRアンジオグラフィーにおける血管描出能評価のための数値指標とその計測法の検討」の論文概要。リケラボ論文検索は、全国の大学リポジトリにある学位論文・教授論文を一括検索できる論文検索サービスです。
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非造影下肢MRアンジオグラフィーにおける血管描出能評価のための数値指標とその計測法の検討

青羽 南臣 藤本 綾子 町田 好男 東北大学

2020.01.31

概要

［Purpose］ In routine examinations using non-contrast enhanced MR angiography, peripheral vessel depic- tion is inadequate. For further image quality improvement, numerical evaluation is necessary. We have been studied signal intensity change（cSI）as an index of vessel brightness or contrast and full width at half maximum change（cFWHM）as an index of vessel sharpness along the vessels in maximum intensity projection（MIP）im- ages used for clinical examinations. However, vessel overlapping on the MIP images or insufficient background suppression obstructed the stable measurement. In this study, cSI and cFWHM were measured and compared using MIP and original 3D images, and the characteristics of the measurement results were discussed.

［Methods］ Coronal 3D images of five normal volunteers were obtained, and MIP images rotated in the horizontal direction were generated, Appropriate projection direction was chosen to avoid vessel overlapping. cSI and cFWHM were calculated by quadratic and Gaussian fitting to vessels in MIP and axial reformat images.

［Results and Discussion］ A simple quadratic fitting was appropriate for stable measurement with thin blood vessels for both images. cSI was an effective index for numerically expressing blood vessel contrast. Although cFWHM was not suitable for expressing the sharpness itself, it was suggested that the increase in blood vessel diameter contributed to the improvement of blood vessel visualization. As a simple evaluation method, MIP-based measurement can be useful.

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