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Effects of Tissue Relaxation, Eddy currents, and Acceleration on Velocity-Selective Preparation Pulses
- Title
- Effects of Tissue Relaxation, Eddy currents, and Acceleration on Velocity-Selective Preparation Pulses
- Authors
- Shin, Taehoon
- Ewha Authors
- 신태훈
- SCOPUS Author ID
- 신태훈
- Issue Date
- 2023
- Journal Title
- JOURNAL OF MAGNETICS
- ISSN
- 1226-1750
2233-6656
- Citation
- JOURNAL OF MAGNETICS vol. 28, no. 1, pp. 49 - 55
- Keywords
- velocity selective magnetization preparation; eddy currents; non-contrast-enhanced MR angiography
- Publisher
- KOREAN MAGNETICS SOC
- Indexed
- SCIE; SCOPUS; KCI
- Document Type
- Article
- Abstract
- Fourier-transform-based velocity-selective (FT-VS) magnetization preparation has shown great promise for unenhanced MR angiography and arterial spin labeling. Although recent technical advances made FT-VS preparation resistant to B-0 and B-1 field inhomogeneity, there remain other non-ideal conditions including tissue relaxation, eddy currents, and accelerated motion, which are often ignored during excitation pulse design. In this study, using a double-refocused VS preparation pulse as a testbed, excitation profiles were numerically simulated taking into account the potential effects of the three non-ideal conditions. The longitudinal magnetization of arterial blood resulting from FT-VS preparation turned out to decrease from the ideal value of M-0 to 0.92M(0), 0.99M(0), and 0.88M(0) due to tissue relaxation, eddy currents, and accelerated motion, respectively. When all three factors were considered simultaneously, the worst-case relative contrast ratio (CR) between arterial blood and muscle tissue was estimated as 0.86, corresponding to a decrease by 14 % from the ideal CR of 1.0.
- DOI
- 10.4283/JMAG.2023.28.1.049
- Appears in Collections:
- 공과대학 > 휴먼기계바이오공학과 > Journal papers
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