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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 대한자기공명의과학회 Investigative Magnetic Resonance Imaging Investigative Magnetic Resonance Imaging 제22권 제1호
- 발행연도
- 2018.1
- 수록면
- 37 - 49 (13page)
이용수
초록· 키워드
오류제보하기
Purpose: The effect of global inhomogeneity on quantitative susceptibility mapping (QSM) was investigated. A technique referred to as Simultaneous Unwrapping Phase with Error Recovery from inhomogeneity (SUPER) is suggested as a preprocessing to QSM to remove global field inhomogeneity-induced phase by polynomial fitting. Materials and Methods: The effect of global inhomogeneity on QSM was investigated by numerical simulations. Three types of global inhomogeneity were added to the tissue susceptibility phase, and the root mean square error (RMSE) in the susceptibility map was evaluated. In-vivo QSM imaging with volunteers was carried out for 3.0T and 7.0T MRI systems to demonstrate the efficacy of the proposed method. Results: The SUPER technique removed harmonic and non-harmonic global phases. Previously only the harmonic phase was removed by the background phase removal method. The global phase contained a non-harmonic phase due to various experimental and physiological causes, which degraded a susceptibility map. The RMSE in the susceptibility map increased under the influence of global inhomogeneity; while the error was consistent, irrespective of the global inhomogeneity, if the inhomogeneity was corrected by the SUPER technique. In-vivo QSM imaging with volunteers at 3.0T and 7.0T MRI systems showed better definition in small vascular structures and reduced fluctuation and non-uniformity in the frontal lobes, where field inhomogeneity was more severe. Conclusion: Correcting global inhomogeneity using the SUPER technique is an effective way to obtain an accurate susceptibility map on QSM method. Since the susceptibility variations are small quantities in the brain tissue, correction of the inhomogeneity is an essential element for obtaining an accurate QSM.
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등록된 정보가 없습니다.
참고문헌 (33)
참고문헌 신청
Salomir R / 2003 / A fast calculation method for magnetic field inhomogeneity due to an arbitrary distribution of bulk susceptibility / Concepts in Magn Reson Part B (Magn Reson Engineering) 19B:26~34
조장희 / 2016 / Review of Recent Advancement of Ultra High Field Magnetic Resonance Imaging: from Anatomy to Tractography / Investigative Magnetic Resonance Imaging 20(3):141~151
Haacke EM / 2004 / Susceptibility weighted imaging (SWI) / Magn Reson Med 52:612~618
Sehgal V / 2005 / Clinical applications of neuroimaging with susceptibility-weighted imaging / J Magn Reson Imaging 22:439~450
Mittal S / 2009 / Susceptibilityweighted imaging: technical aspects and clinical applications, part 2 / AJNR Am J Neuroradiol 30:232~252
조장희 / 2016 / Review of Recent Advancement of Ultra High Field Magnetic Resonance Imaging: from Anatomy to Tractography / Investigative Magnetic Resonance Imaging 20(3):141~151
Haacke EM / 2004 / Susceptibility weighted imaging (SWI) / Magn Reson Med 52:612~618
Sehgal V / 2005 / Clinical applications of neuroimaging with susceptibility-weighted imaging / J Magn Reson Imaging 22:439~450
Mittal S / 2009 / Susceptibilityweighted imaging: technical aspects and clinical applications, part 2 / AJNR Am J Neuroradiol 30:232~252
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