دورية أكاديمية
أعرض في EDS

Design of parallel transmission radiofrequency pulses robust against respiration in cardiac MRI at 7 Tesla.

التفاصيل البيبلوغرافية
العنوان: Design of parallel transmission radiofrequency pulses robust against respiration in cardiac MRI at 7 Tesla.
المؤلفون: Schmitter S; University of Minnesota, Center for Magnetic Resonance Research, Minneapolis, Minnesota, USA., Wu X; University of Minnesota, Center for Magnetic Resonance Research, Minneapolis, Minnesota, USA., Uğurbil K; University of Minnesota, Center for Magnetic Resonance Research, Minneapolis, Minnesota, USA., Van de Moortele PF; University of Minnesota, Center for Magnetic Resonance Research, Minneapolis, Minnesota, USA.
المصدر: Magnetic resonance in medicine [Magn Reson Med] 2015 Nov; Vol. 74 (5), pp. 1291-305. Date of Electronic Publication: 2014 Nov 19.
نوع المنشور: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't
اللغة: English
بيانات الدورية: Publisher: Wiley Country of Publication: United States NLM ID: 8505245 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1522-2594 (Electronic) Linking ISSN: 07403194 NLM ISO Abbreviation: Magn Reson Med Subsets: MEDLINE
أسماء مطبوعة: Publication: 1999- : New York, NY : Wiley
Original Publication: San Diego : Academic Press,
مواضيع طبية MeSH: Cardiac Imaging Techniques/*methods , Image Processing, Computer-Assisted/*methods , Magnetic Resonance Imaging, Cine/*methods, Breath Holding ; Heart Rate/physiology ; Humans ; Radio Waves ; Signal Processing, Computer-Assisted
مستخلص: Purpose: Two-spoke parallel transmission (pTX) radiofrequency (RF) pulses have been demonstrated in cardiac MRI at 7T. However, current pulse designs rely on a single set of B1(+)/B0 maps that may not be valid for subsequent scans acquired at another phase of the respiration cycle because of organ displacement. Such mismatches may yield severe excitation profile degradation.
Methods: B1(+)/B0 maps were obtained, using 16 transmit channels at 7T, at three breath-hold positions: exhale, half-inhale, and inhale. Standard and robust RF pulses were designed using maps obtained at exhale only, and at multiple respiratory positions, respectively. Excitation patterns were analyzed for all positions using Bloch simulations. Flip-angle homogeneity was compared in vivo in cardiac CINE acquisitions.
Results: Standard one- and two-spoke pTX RF pulses are sensitive to breath-hold position, primarily due to B1(+) alterations, with high dependency on excitation trajectory for two spokes. In vivo excitation inhomogeneity varied from nRMSE = 8.2% (exhale) up to 32.5% (inhale) with the standard design; much more stable results were obtained with the robust design with nRMSE = 9.1% (exhale) and 10.6% (inhale).
Conclusion: A new pTX RF pulse design robust against respiration induced variations of B1(+)/B0 maps is demonstrated and is expected to have a positive impact on cardiac MRI in breath-hold, free-breathing, and real-time acquisitions.
(© 2014 Wiley Periodicals, Inc.)
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معلومات مُعتمدة: S10 RR026783 United States RR NCRR NIH HHS; S10 RR26783 United States RR NCRR NIH HHS; P41 EB015894 United States EB NIBIB NIH HHS; R01-EB007327 United States EB NIBIB NIH HHS; R21 EB009133 United States EB NIBIB NIH HHS; R21 EB009138 United States EB NIBIB NIH HHS; R01-EB006835 United States EB NIBIB NIH HHS; R01 EB006835 United States EB NIBIB NIH HHS; R01 EB007327 United States EB NIBIB NIH HHS; R42 EB013543 United States EB NIBIB NIH HHS
فهرسة مساهمة: Keywords: 7 Tesla; RF pulse design; breath-hold; cardiac MRI; pTX; respiration; spoke pulses
تواريخ الأحداث: Date Created: 20141121 Date Completed: 20160815 Latest Revision: 20181113
رمز التحديث: 20231215
مُعرف محوري في PubMed: PMC4437923
DOI: 10.1002/mrm.25512
PMID: 25411131
قاعدة البيانات: MEDLINE
الوصف
تدمد:1522-2594
DOI:10.1002/mrm.25512