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Compressed‐sensing motion compensation (CosMo): A joint prospective–retrospective respiratory navigator for coronary MRI
Author(s) -
Moghari Mehdi H.,
Akçakaya Mehmet,
O'Connor Alan,
Basha Tamer A.,
Casanova Michele,
Stanton Douglas,
Goepfert Lois,
Kissinger Kraig V.,
Goddu Beth,
Chuang Michael L.,
Tarokh Vahid,
Manning Warren J.,
Nezafat Reza
Publication year - 2011
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.22950
Subject(s) - undersampling , compressed sensing , motion compensation , artificial intelligence , computer science , computer vision , medicine
Prospective right hemidiaphragm navigator (NAV) is commonly used in free‐breathing coronary MRI. The NAV results in an increase in acquisition time to allow for resampling of the motion‐corrupted k ‐space data. In this study, we are presenting a joint prospective–retrospective NAV motion compensation algorithm called compressed‐sensing motion compensation (CosMo). The inner k ‐space region is acquired using a prospective NAV; for the outer k ‐space, a NAV is only used to reject the motion‐corrupted data without reacquiring them. Subsequently, those unfilled k ‐space lines are retrospectively estimated using compressed sensing reconstruction. We imaged right coronary artery in nine healthy adult subjects. An undersampling probability map and sidelobe‐to‐peak ratio were calculated to study the pattern of undersampling, generated by NAV. Right coronary artery images were then retrospectively reconstructed using compressed‐sensing motion compensation for gating windows between 3 and 10 mm and compared with the ones fully acquired within the gating windows. Qualitative imaging score and quantitative vessel sharpness were calculated for each reconstruction. The probability map and sidelobe‐to‐peak ratio show that the NAV generates a random undersampling k ‐space pattern. There were no statistically significant differences between the vessel sharpness and subjective score of the two reconstructions. Compressed‐sensing motion compensation could be an alternative motion compensation technique for free‐breathing coronary MRI that can be used to reduce scan time. Magn Reson Med, 2011. © 2011 Wiley Periodicals, Inc.