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Free‐Breathing 3D Cardiac MRI Using Iterative Image‐Based Respiratory Motion Correction
Author(s) -
Moghari Mehdi H.,
Roujol Sébastien,
Chan Raymond H.,
Hong Susie N.,
Bello Natalie,
Henningsson Markus,
Ngo Long H.,
Goddu Beth,
Goepfert Lois,
Kissinger Kraig V.,
Manning Warren J.,
Nezafat Reza
Publication year - 2013
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.24538
Subject(s) - gating , image quality , breathing , diaphragmatic breathing , motion compensation , window (computing) , medicine , computer science , nuclear medicine , computer vision , biomedical engineering , image (mathematics) , physiology , alternative medicine , pathology , anatomy , operating system
Respiratory motion compensation using diaphragmatic navigator gating with a 5 mm gating window is conventionally used for free‐breathing cardiac MRI. Because of the narrow gating window, scan efficiency is low resulting in long scan times, especially for patients with irregular breathing patterns. In this work, a new retrospective motion compensation algorithm is presented to reduce the scan time for free‐breathing cardiac MRI that increasing the gating window to 15 mm without compromising image quality. The proposed algorithm iteratively corrects for respiratory‐induced cardiac motion by optimizing the sharpness of the heart. To evaluate this technique, two coronary MRI datasets with 1.3 mm 3 resolution were acquired from 11 healthy subjects (seven females, 25 ± 9 years); one using a navigator with a 5 mm gating window acquired in 12.0 ± 2.0 min and one with a 15 mm gating window acquired in 7.1 ± 1.0 min. The images acquired with a 15 mm gating window were corrected using the proposed algorithm and compared to the uncorrected images acquired with the 5 and 15 mm gating windows. The image quality score, sharpness, and length of the three major coronary arteries were equivalent between the corrected images and the images acquired with a 5 mm gating window ( P ‐value > 0.05), while the scan time was reduced by a factor of 1.7. Magn Reson Med, 70:1005–1015, 2013. © 2012 Wiley Periodicals, Inc.