| Comparison of respiratory suppression methods and navigator locations for MR coronary angiography. | |
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MedLine Citation:
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PMID: 9129447 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: Currently, breath-holding during MR coronary angiography is used to minimize respiratory motion. This technique requires patient cooperation and is associated with slice registration errors. The goal of this study was to evaluate alternative non-breath-hold techniques for MR coronary angiography during free breathing. SUBJECTS AND METHODS: Subjects underwent MR coronary angiography using an ECG-gated, fat-suppressed, segmented K-space, gradient-echo sequence. Images were obtained during free breathing using both real-time navigator gating and respiratory bellows gating. These were compared with images obtained during conventional breath-holding. The optimal navigator location (diaphragmatic or cardiac) was also studied. Image quality, registration error, and scan time were measured for all scans. RESULTS: Navigator gating for MR coronary angiography during free breathing resulted in image quality equivalent to that obtained during breath-holding and was superior to that obtained with respiratory bellows gating (p < .04). Also, navigator gating reduced registration errors by 75% compared with breath-holding (p < .01) and did not increase scan time. No significant differences in the parameters measured were observed among the different navigator locations. CONCLUSION: Real-time navigator gating for MR coronary angiography during free breathing achieved image quality and scan time equivalent to breath-holding. Navigator gating also significantly reduced registration error. Compared with breath-holding and respiratory bellows gating, navigator gating during free breathing is a more optimal approach for suppression of respiratory motion during MR coronary angiography. |
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Authors:
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M V McConnell; V C Khasgiwala; B J Savord; M H Chen; M L Chuang; R R Edelman; W J Manning |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: AJR. American journal of roentgenology Volume: 168 ISSN: 0361-803X ISO Abbreviation: AJR Am J Roentgenol Publication Date: 1997 May |
Date Detail:
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Created Date: 1997-05-20 Completed Date: 1997-05-20 Revised Date: 2008-02-15 |
Medline Journal Info:
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Nlm Unique ID: 7708173 Medline TA: AJR Am J Roentgenol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1369-75 Citation Subset: AIM; IM |
Affiliation:
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Department of Medicine, Charles A. Dana Research Institute, Boston, MA, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aged Artifacts Coronary Vessels / anatomy & histology* Electrocardiography Evaluation Studies as Topic Female Humans Magnetic Resonance Angiography / methods* Male Middle Aged Respiration Time Factors |
| Grant Support | |
ID/Acronym/Agency:
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F33 HL09095/HL/NHLBI NIH HHS; R01 HL48538/HL/NHLBI NIH HHS |
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