期刊
MAGNETIC RESONANCE IN MEDICINE
卷 56, 期 1, 页码 177-186出版社
JOHN WILEY & SONS INC
DOI: 10.1002/mrm.20927
关键词
metal artifact; susceptibility artifact; prepolarized MRI; low-field MRI; low-cost MRI
资金
- NCI NIH HHS [5R24CA092862-03] Funding Source: Medline
- NIBIB NIH HHS [1R01 EB0002524, R33 EB00777, R01 EB00346] Funding Source: Medline
A prepolarized MRI (PMRI) scanner was used to image near metal implants in agar gel phantoms and in in vivo human wrists. Comparison images were made on 1.5- and 0.5-T conventional whole-body systems. The PMRI experiments were performed in a smaller bore system tailored to extremity imaging with a prepolarization magnetic field of 0.4 T and a readout magnetic field of 27-54 mT (1.1-2.2 MHz). Scan parameters were chosen with equal readout gradient strength over a given field of view and matrix size to allow unbiased evaluation of the benefits of lower readout frequency. Results exhibit substantial reduction in metal susceptibility artifacts under PMRI versus conventional scanners. A new artifact quantification technique is also presented, and phantom results confirm that susceptibility artifacts improve as expected with decreasing readout magnetic field using PMRI. This proof-of-concept study demonstrates that prepolarized techniques have the potential to provide diagnostic cross-sectional images for postoperative evaluation of patients with metal implants.
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