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Usefulness analysis of radial non-cartesian trajectory in the high-resolution MRA

고해상도 MRA 시 방사형 비직각좌표계 k-space 주사방식의 유용성 분석

Lee, Ho-Beom;Choi, Kwan-Woo;Son, Soon-Yong
이호범;최관우;손순룡

  • Received : 2013.08.29
  • Accepted : 2013.12.05
  • Published : 2013.12.31

Abstract

With the application of k-space trajectory in a different manner and analyzing the influence of noise and its direction, this study was conducted to obtain high-quality images with minimal influence of noise during an MRI examination for cerebrovascular disease, which has a low signal for imaging. To evaluate influence of the noise of different k-space trajectories, a linear Cartesian coordination trajectory and non-Cartesian coordination trajectory were applied to 38 people who had received a high-resolution MRI examination for the early detection of cerebrovascular disease. As a result, the non-Cartesian coordination trajectory showed a 43.32% lower signal of lumens in the internal carotid artery than a linear Cartesian coordination trajectory, and the noise level was also 50.19% lower in a non-Cartesian coordination trajectory. This result shows that noise occurs less in a non-Cartesian coordination trajectory than a linear Cartesian coordination trajectory, and a non-Cartesian coordination trajectory is more effective in low-signal and low-resolution MRI examination. Therefore, when performing high-resolution MRI examination with a low-signal cerebrovascular system, the use of non-Cartesian coordination k-space trajectory will minimize the influence of noise and provide good images.

Keywords

k-space trajectory;Noise map;Flow artifact;Internal carotid artery;High-resolution MRI

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