PURPOSE: To determine the feasibility of using magnetic resonance imaging (MRI) to non-invasively measure strain in the aortic wall. MATERIALS AND METHODS: Cine phase contrast MRI was used to measure the velocity of the aortic wall and calculate changes in circumferential strain over the cardiac cycle. A deformable vessel phantom was used for initial testing and in vitro validation. Ultrasonic sonomicrometer crystals were attached to the vessel wall and used as a gold standard. RESULTS: In the in vitro validation, MRI-calculated wall displacements were within 0.02 mm of the sonomicrometer measurements when maximal displacement was 0.28 mm. The measured maximum strain in vitro was 0.02. The in vivo results were on the same order as prior results using ultrasound echo-tracking. CONCLUSION: Results of in vivo studies and measurement of cyclic strain in human thoracic and abdominal aortas demonstrate the feasibility of the technique. Copyright 2002 Wiley-Liss, Inc.
PURPOSE: To determine the feasibility of using magnetic resonance imaging (MRI) to non-invasively measure strain in the aortic wall. MATERIALS AND METHODS:Cine phase contrast MRI was used to measure the velocity of the aortic wall and calculate changes in circumferential strain over the cardiac cycle. A deformable vessel phantom was used for initial testing and in vitro validation. Ultrasonic sonomicrometer crystals were attached to the vessel wall and used as a gold standard. RESULTS: In the in vitro validation, MRI-calculated wall displacements were within 0.02 mm of the sonomicrometer measurements when maximal displacement was 0.28 mm. The measured maximum strain in vitro was 0.02. The in vivo results were on the same order as prior results using ultrasound echo-tracking. CONCLUSION: Results of in vivo studies and measurement of cyclic strain in human thoracic and abdominal aortas demonstrate the feasibility of the technique. Copyright 2002 Wiley-Liss, Inc.
Authors: El-Sayed H Ibrahim; Kevin R Johnson; Alan B Miller; Jean M Shaffer; Richard D White Journal: J Cardiovasc Magn Reson Date: 2010-05-11 Impact factor: 5.364
Authors: Thanh D Nguyen; Ludovic de Rochefort; Pascal Spincemaille; Matthew D Cham; Jonathan W Weinsaft; Martin R Prince; Yi Wang Journal: J Magn Reson Imaging Date: 2008-11 Impact factor: 4.813
Authors: Volker Herold; Jeremy Wellen; Christian H Ziener; Thomas Weber; Karl-Heinz Hiller; Peter Nordbeck; Eberhard Rommel; Axel Haase; Wolfgang R Bauer; Peter M Jakob; Susanta K Sarkar Journal: MAGMA Date: 2009-01-20 Impact factor: 2.310