Dynamic exercise imaging with an MR-compatible stationary cycle within the general electric open magnet
✍ Scribed by Christopher P. Cheng; Douglas F. Schwandt; Eric L. Topp; James H. Anderson; Robert J. Herfkens; Charles A. Taylor
- Publisher
- John Wiley and Sons
- Year
- 2003
- Tongue
- English
- Weight
- 370 KB
- Volume
- 49
- Category
- Article
- ISSN
- 0740-3194
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✦ Synopsis
Many cases of muscular ischemia do not manifest without increased metabolic demand. Hence, diagnosis of intermittent claudication often requires inducing physiologic challenge, such as by exercise. Cine phase-contrast MRI can concurrently acquire cross-sectional vascular anatomy and through-plane blood velocities, enabling blood flow rate quantification. An MR-compatible stationary cycle was designed, constructed, and tested for flow quantification in large arteries during lower-limb exercise in a General Electric Signa SP 0.5 T open magnet. The cycle demonstrated smooth cycling during image acquisition, has freewheeling capability, is adjustable for subject size and strength, and can quantify workload. A healthy 59-year-old male was imaged at the supraceliac and infrarenal levels of the abdominal aorta at rest and during exercise. An exercise workload of 47.9 W was achieved. His heart rate increased from 52 to 78 bpm, supraceliac flow increased from 1.7 to 3.7 L/min, and infrarenal flow increased from 0.4 to 3.2 L/min from rest to exercise.