Theodore Towse
Last active: 4/25/2016

Comparison of muscle BOLD responses to arterial occlusion at 3 and 7 Tesla.

Towse TF, Childs BT, Sabin SA, Bush EC, Elder CP, Damon BM
Magn Reson Med. 2016 75 (3): 1333-40

PMID: 25884888 · PMCID: PMC4609213 · DOI:10.1002/mrm.25562

PURPOSE - The purpose of this study was to determine the feasibility of muscle BOLD (mBOLD) imaging at 7 Tesla (T) by comparing the changes in R2* of muscle at 3 and 7T in response to a brief period of tourniquet-induced ischemia.

METHODS - Eight subjects (three male), aged 29.5 ± 6.1 years (mean ± standard deviation, SD), 167.0 ± 10.6 cm tall with a body mass of 62.0 ± 18.0 kg, participated in the study. Subjects reported to the lab on four separate occasions including a habituation session, two MRI scans, and in a subset of subjects, a session during which changes in blood flow and blood oxygenation were quantified using Doppler ultrasound (U/S) and near-infrared spectroscopy (NIRS) respectively. For statistical comparisons between 3 and 7T, R2* rate constants were calculated as R2* = 1/T2*.

RESULTS - The mean preocclusion R2* value was greater at 7T than at 3T (60.16 ± 2.95 vs. 35.17 ± 0.35 s(-1), respectively, P < 0.001). Also, the mean ΔR2 *END and ΔR2*POST values were greater for 7T than for 3T (-2.36 ± 0.25 vs. -1.24 ± 0.39 s(-1), respectively, Table 1).

CONCLUSION - Muscle BOLD contrast at 7T is as much as six-fold greater than at 3T. In addition to providing greater SNR and CNR, 7T mBOLD studies may offer further advantages in the form of greater sensitivity to pathological changes in the muscle microcirculation.

© 2015 Wiley Periodicals, Inc.

MeSH Terms (12)

Adult Arterial Occlusive Diseases Female Humans Image Processing, Computer-Assisted Magnetic Resonance Imaging Male Muscle, Skeletal Oxygen Spectroscopy, Near-Infrared Ultrasonography, Doppler Young Adult

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