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DOI:10.2214/AJR.07.2503
AJR 2008; 191:38-42
© American Roentgen Ray Society

Original Research

3-T Navigator Parallel-Imaging Coronary MR Angiography: Targeted-Volume Versus Whole-Heart Acquisition

Shixin Chang1, Matthew D. Cham2, Shuguang Hu3 and Yi Wang2

1 Department of Radiology, Dongfang Hospital, Tongji University, Shanghai, China.
2 Department of Radiology, Weill Medical College of Cornell University, 575 Lexington Ave., 3rd Fl., New York, NY 10022.
3 Philips Healthcare, Shanghai, China.

OBJECTIVE. The purpose of this study was to compare whole-heart acquisition with targeted-volume acquisition in 3-T navigator coronary MR angiography with parallel imaging.

SUBJECTS AND METHODS. The right and left coronary arteries of 20 subjects were imaged with axial whole-heart acquisition and two oblique targeted-volume acquisitions.

RESULTS. Both whole-heart and targeted-volume acquisitions were completed with similar navigator efficiencies ({approx} 50%) and depicted similar coronary artery diameters ({approx} 3 mm) (p ≥ 0.06). The lengths of the coronary arteries were not significantly different (p = 0.07–0.45) for the whole-heart and targeted-volume approaches. Depiction of the sharper coronary arteries (p ≤ 0.04) and overall image quality (p < 0.02) were better with the targeted-volume approach.

CONCLUSION. For current 3-T navigator parallel-imaging coronary MR angiography, targeted-volume acquisition yields sharper coronary images than does whole-heart acquisition.

Keywords: 3 T • coronary MR angiography • navigator • targeted volume • whole heart


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