Relationship between motion of coronary arteries and diaphragm during free breathing: lessons from real-time MR imaging.

Détails

ID Serval
serval:BIB_8780FEED1BAF
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Relationship between motion of coronary arteries and diaphragm during free breathing: lessons from real-time MR imaging.
Périodique
Ajr. American Journal of Roentgenology
Auteur⸱e⸱s
Danias P.G., Stuber M., Botnar R.M., Kissinger K.V., Edelman R.R., Manning W.J.
ISSN
0361-803X[print], 0361-803X[linking]
Statut éditorial
Publié
Date de publication
1999
Volume
172
Numéro
4
Pages
1061-1065
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
OBJECTIVE: Diaphragmatic navigators are frequently used in free-breathing coronary MR angiography, either to gate or prospectively correct slice position or both. For such approaches, a constant relationship between coronary and diaphragmatic displacement throughout the respiratory cycle is assumed. The purpose of this study was to evaluate the relationship between diaphragmatic and coronary artery motion during free breathing. SUBJECTS AND METHODS: A real-time echoplanar MR imaging sequence was used in 12 healthy volunteers to obtain 30 successive images each (one per cardiac cycle) that included the left main coronary artery and the domes of both hemidiaphragms. The coronary artery and diaphragm positions (relative to isocenter) were determined and analyzed for effective diaphragmatic gating windows of 3, 5, and 7 mm (diaphragmatic excursions of 0-3, 0-5, and 0-7 mm from the end-expiratory position, respectively). RESULTS: Although the mean slope correlating the displacement of the right diaphragm and the left main coronary artery was approximately 0.6 for all diaphragmatic gating windows, we also found great variability among individual volunteers. Linear regression slopes varied from 0.17 to 0.93, and r2 values varied from .04 to .87. CONCLUSION: Wide individual variability exists in the relationship between coronary and diaphragmatic respiratory motion during free breathing. Accordingly, coronary MR angiographic approaches that use diaphragmatic navigator position for prospective slice correction may benefit from patient-specific correction factors. Alternatively, coronary MR angiography may benefit from a more direct assessment of the respiratory displacement of the heart and coronary arteries, using left ventricular navigators.
Mots-clé
Adult, Coronary Vessels/physiology, Diaphragm/physiology, Echo-Planar Imaging, Electrocardiography, Female, Humans, Image Processing, Computer-Assisted, Magnetic Resonance Angiography, Male, Motion, Prospective Studies, Respiration
Pubmed
Web of science
Création de la notice
02/03/2010 16:04
Dernière modification de la notice
20/08/2019 14:46
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