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4D radial coronary artery imaging within a single breath‐hold: Cine angiography with phase‐sensitive fat suppression (CAPS)
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.20627
Subject(s) - steady state free precession imaging , streak , temporal resolution , cardiac cycle , cardiac imaging , artifact (error) , signal (programming language) , angiography , medicine , nuclear magnetic resonance , magnetic resonance imaging , physics , radiology , cardiology , computer science , artificial intelligence , optics , programming language
Coronary artery data acquisition with steady‐state free precession (SSFP) is typically performed in a single frame in mid‐diastole with a spectrally selective pulse to suppress epicardial fat signal. Data are acquired while the signal approaches steady state, which may lead to artifacts from the SSFP transient response. To avoid sensitivity to cardiac motion, an accurate trigger delay and data acquisition window must be determined. Cine data acquisition is an alternative approach for resolving these limitations. However, it is challenging to use conventional fat saturation with cine imaging because it interrupts the steady‐state condition. The purpose of this study was to develop a 4D coronary artery imaging technique, termed “cine angiography with phase‐sensitive fat suppression” (CAPS), that would result in high temporal and spatial resolution simultaneously. A 3D radial stacked k ‐space was acquired over the entire cardiac cycle and then interleaved with a sliding window. Sensitivity‐encoded (SENSE) reconstruction with rescaling was developed to reduce streak artifact and noise. Phase‐sensitive SSFP was employed for fat suppression using phase detection. Experimental studies were performed on volunteers. The proposed technique provides high‐resolution coronary artery imaging for all cardiac phases, and allows multiple images at mid‐diastole to be averaged, thus enhancing the signal‐to‐noise ratio (SNR) and vessel delineation. Magn Reson Med, 2005. © 2005 Wiley‐Liss, Inc.