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Cardiac Imaging |
1 From the Departments of Cardiology (S.E.L., H.W.V., J.W.J., E.E.v.d.W.) and Radiology (P.K., H.J.L., A.d.R.), Leiden University Medical Center, Albinusdreef 2, 2300 RC Leiden, the Netherlands; and the Interuniversity Cardiology Institute of the Netherlands, Utrecht (S.E.L, E.E.v.d.W., A.d.R.). Received March 10, 2000; revision requested April 26; revision received June 16; accepted July 25. S.E.L. supported by a grant from the Netherlands Heart Foundation (96.122). Address correspondence to A.d.R. (e-mail: A.de_Roos@LUMC.nl).
PURPOSE: To validate a recently developed fast high-temporal-resolution magnetic resonance (MR) flow sequence and use it to assess coronary artery bypass graft function during pharmacologic stress.
MATERIALS AND METHODS: Aortic and internal mammary artery flow was measured in 11 healthy volunteers by using conventional cine gradient-echo imaging as a reference standard method and turbo-field echo-planar imaging (TFEPI). By using TFEPI, breath-hold flow mapping with a spatial and temporal resolution of 0.8 mm2 and 23 msec, respectively, can be performed. This sequence was applied in 20 angiographically normal grafts, and total blood flow at rest and during adenosine infusion (140 µg/kg/min) was measured.
RESULTS: Good agreement in aortic and internal mammary artery flow values between conventional fast-field echo and TFEPI techniques was found. The mean bypass graft total flow (± SD), as assessed with TFEPI, increased from 30.8 mL/min ± 13.5 to 76.7 mL/min ± 36.5 (P < .05) to yield a flow reserve of 2.7. Furthermore, this sequence revealed a difference in total flow between single and sequential grafts at rest (25.4 mL/min vs 40.9 mL/min; P < .05) and during stress (65.2 mL/min vs 98.3 mL/min; P < .05).
CONCLUSION: Breath-hold TFEPI provides fast accurate flow measurements with high temporal resolution and allows motion-compensated flow quantification in multiple coronary artery bypass grafts during one 6-minute adenosine infusion.
Index terms: Arteries, grafts and prostheses, 941.1269, 949.1269 • Arteries, MR, 941.129412, 941.129416, 941.12944 • Arteries, stenosis or obstruction, 941.721, 949.721 • Blood, flow dynamics • Coronary vessels, flow dynamics, 54.731 • Magnetic resonance (MR), vascular studies, 941.12944
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Radiology 2001 218: 326-328.
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