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Timing of Data Acquisition Determines Image Quality in Femoropopliteal Phase-Sensitive MR Angiography

Department of Medicine, Division of Cardiovascular Disease and Department of Surgery, Division of Vascular Surgery, University of Alabama at Birmingham Station, Birmingham, Alabama

G. Gross

Department of Medicine, Division of Cardiovascular Disease and Department of Surgery, Division of Vascular Surgery, University of Alabama at Birmingham Station, Birmingham, Alabama

N. Nanda

Department of Medicine, Division of Cardiovascular Disease and Department of Surgery, Division of Vascular Surgery, University of Alabama at Birmingham Station, Birmingham, Alabama

G. Pohost

Department of Medicine, Division of Cardiovascular Disease and Department of Surgery, Division of Vascular Surgery, University of Alabama at Birmingham Station, Birmingham, Alabama

To study the effects of timing of data acquisition on quality of femoropopli teal magnetic resonance (MR) angiograms, the authors studied 16 healthy men, mean age 34.3 ± 6 years, by color Doppler imaging and by phase-sensitive (PS) MR angiography. PS MR imaging was performed at 1.5T using a flow adjusta ble gradient (FLAG) pulse sequence. The images were graded in a blinded fash ion by two independent observers.

Of 16 MR angiograms consisting of 141 angiographic images (AI), 45 (31.9%) were diagnostic. At least 1 diagnostic AI was obtained in each subject, and 38 (84.4%) of the diagnostic images were acquired within the first 120 milli seconds (ms) of the systolic flow pulse. The highest yield of diagnostic images (90.9%) was obtained in the interval of thirty to sixty ms before the peak flow velocity.

In healthy man diagnostic PS MR angiography requires triggering to the femoropopliteal systolic flow pulse. The highest yield of diagnostic images is acquired during the flow pulse acceleration.

Angiology, Vol. 41, No. 10, 817-824 (1990)
DOI: 10.1177/000331979004101002


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