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High‐resolution steady‐state free precession coronary magnetic resonance angiography within a breath‐hold: Parallel imaging with extended cardiac data acquisition
Author(s) -
Park Jaeseok,
Larson Andrew C.,
Zhang Qiang,
Simonetti Orlando,
Li Debiao
Publication year - 2005
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.20664
Subject(s) - data acquisition , electromagnetic coil , magnetic resonance imaging , image resolution , image quality , cardiac imaging , computer science , calibration , computer vision , artificial intelligence , medicine , radiology , physics , quantum mechanics , image (mathematics) , operating system
Abstract Coronary artery imaging data are conventionally acquired in a single imaging frame during mid‐diastole. The data acquisition window must be sufficiently short to avoid cardiac motion artifacts. A short data acquisition window results in decreased imaging efficiency and limited spatial resolution. Parallel imaging may lessen these limitations, but requires highly accurate coil sensitivity. The purpose of this work was to increase the imaging efficiency and spatial resolution in coronary artery imaging using parallel imaging with an extended acquisition window. External coil calibration data were acquired before and after a short mid‐diastolic period of accelerated imaging data acquisition. It was assumed that residual cardiac motion in the extended acquisition window would not impede accurate estimation of coil sensitivity since only low spatial frequency signals were acquired for coil calibration. Experimental studies were performed in five healthy volunteers at 3 T using steady‐state free precession sequence. Statistical comparison was made between the proposed method and conventional data acquisition for visual quality of image and vessel sharpness. The proposed technique demonstrated higher visual grading and improved vessel sharpness. The proposed method is a new approach to enhance the imaging efficiency and spatial resolution in coronary artery imaging. Magn Reson Med, 2005. © 2005 Wiley‐Liss, Inc.