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0.55 T Magnetic Resonance Imaging in the Abdomen and Pelvis: Opportunities and Challenges
Michael A Ohliger1, Cheng Hong, Kang Wang
1From the Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA.
Abstract:
As applications of MRI in the abdomen and pelvis have increased, access to MRI scanners has become more crucial. 0.55 T MRI scanners can potentially improve access by reducing the costs of MR systems and simplifying their siting requirements. These savings come with important tradeoffs, most notably decreased SNR efficiency. Decreases in SNR can be ameliorated to some degree by shorter T1 (faster repetition time), longer T2* (reduced susceptibility artifacts), and higher gadolinium relaxivity, which are found at lower fields. Reduced frequency separation between fat and water presents a particular challenge in imaging the abdomen and pelvis. In this article, we review how MRI at 0.55 T affects abdominal and pelvic imaging and discuss clinical examples of the liver, kidney, bile ducts, uterus, and ovary. We illustrate how metal artifacts are reduced at 0.55 T and discuss how deep learning image reconstructions, combined with free-breathing techniques, can overcome some of the limitations imposed by reduced SNR. We discuss future challenges and opportunities in this field, leveraging technological advances from other fields to bring MRI to more people who need it.
Insights
Lower-field 0.55 Tesla MRI scanners offer improved access for abdominal and pelvic imaging by reducing costs. Advanced techniques help overcome signal-to-noise ratio challenges for better clinical results.
Area of Science:
- Medical Imaging
- Radiology
- Biophysics
Background:
- Increasing demand for abdominal and pelvic MRI necessitates improved scanner accessibility.
- 0.55 Tesla (T) MRI systems present a cost-effective solution with simpler siting requirements.
- Lower field strengths present challenges, including reduced signal-to-noise ratio (SNR) efficiency.
Purpose of the Study:
- To review the impact of 0.55 T MRI on abdominal and pelvic imaging.
- To discuss clinical applications and overcome limitations of lower-field MRI.
Main Methods:
- Review of 0.55 T MRI principles and applications in abdominal and pelvic imaging.
- Discussion of techniques to mitigate SNR reduction, including shorter repetition times, longer T2*, higher relaxivity, and advanced image reconstruction.
- Analysis of clinical examples involving liver, kidney, bile ducts, uterus, and ovary.
Main Results:
- 0.55 T MRI demonstrates reduced metal artifacts compared to higher field strengths.
- Optimized parameters (shorter T1, longer T2*) can compensate for lower SNR.
- Deep learning reconstructions and free-breathing techniques show promise in overcoming SNR limitations.
Conclusions:
- 0.55 T MRI is a viable option for abdominal and pelvic imaging, enhancing accessibility.
- Technological advancements, including deep learning, are crucial for maximizing the potential of lower-field MRI.
- Future developments aim to broaden MRI accessibility through innovative technologies.
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