期刊
JOURNAL OF APPLIED CLINICAL MEDICAL PHYSICS
卷 23, 期 1, 页码 -出版社
WILEY
DOI: 10.1002/acm2.13483
关键词
breast imaging; magnetic resonance imaging; metallic artifact; positron emission tomography; radiofrequency coil
资金
- Research Institute of Radiological Science, Yonsei University College of Medicine
- Basic Science Research Program of the National Research Foundation of Korea - Ministry of Science, ICT & Future Planning, Republic of Korea [2013R1A1A3013165, 2017R1A2B4010407]
- Korea Medical Device Development Fund grant - Korea government (the Ministry of Science and ICT) [KMDF202011A01-04]
- Korea Medical Device Development Fund grant - Korea government (Ministry of Trade, Industry and Energy) [KMDF202011A01-04]
- Korea Medical Device Development Fund grant - Korea government (Ministry of Health & Welfare, Republic of Korea) [KMDF202011A01-04]
- Korea Medical Device Development Fund grant - Korea government (Ministry of Food and Drug Safety) [KMDF202011A01-04]
- National Research Foundation of Korea [2013R1A1A3013165, 2017R1A2B4010407] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The study focused on the feasibility of a proposed two-channel Helmholtz loop for PET-MR imaging and found comparable image quality to the standard conventional coil. By optimizing coil design and construction, conducting electromagnetic field simulations, and acquiring images on PET-CT and MR systems, the proposed RF coil showed improvements in signal-to-noise ratio, image uniformity percent, and Hounsfield units, compared to the standard coil.
Purpose The positron emission tomography (PET)-magnetic resonance (MR) system is a newly emerging technique that yields hybrid images with high-resolution anatomical and metabolic information. With PET-MR imaging, a definitive diagnosis of breast abnormalities will be possible with high spatial accuracy and images will be acquired for the optimal fusion of anatomic locations. Therefore, we propose a PET-compatible two-channel breast MR coil with minimal disturbance to image acquisition which can be used for simultaneous PET-MR imaging in patients with breast cancer. Materials and Methods For coil design and construction, the conductor loops of the Helmholtz coil were tuned, matched, and subdivided with nonmagnetic components. Element values were optimized with an electromagnetic field simulation. Images were acquired on a GE 600 PET-computed tomography (CT) and GE 3.0 T MR system. For this study, we used the T1-weighted image (volunteer; repetition time (TR), 694 ms; echo time (TE), 9.6 ms) and T2-weighted image (phantom; TR, 8742 ms; TE, 104 ms) with the fast spin-echo sequence. Results The results of measuring image factors with the proposed radiofrequency (RF) coil and standard conventional RF coil were as follows: signal-to-noise ratio (breast; 207.7 vs. 175.2), percent image uniformity (phantom; 89.22%-91.27% vs. 94.63%-94.77%), and Hounsfield units (phantom; -4.51 vs. 2.38). Conclusions Our study focused on the feasibility of proposed two-channel Helmholtz loops (by minimizing metallic components and soldering) for PET-MR imaging and found the comparable image quality to the standard conventional coil. We believe our work will help significantly to improve image quality with the development of a less metallic breast MR coil.
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