Perspectives on body MR imaging at ultrahigh field

Area of Science:

• Magnetic Resonance (MR) Imaging
• Medical Imaging Technology
• Biomedical Engineering

Background:

• Advancements in magnetic resonance (MR) imaging technology are pushing field strengths beyond 3 Tesla (3T).
• Existing challenges at 3T, including radiofrequency coil performance, B1 and B0 field homogeneity, specific absorption rate (SAR), safety, tissue contrast alterations, and chemical shift, persist at higher field strengths.
• Investigating new paradigms is crucial for effectively and comprehensively addressing clinical questions with ultrahigh field MR imaging.

Purpose of the Study:

• To review the persistent challenges in magnetic resonance (MR) imaging at ultrahigh field strengths (above 3T).
• To discuss potential approaches for overcoming these technical hurdles.
• To explore the applications of ultrahigh field MR imaging in specific clinical protocols.

Main Methods:

• Review of existing literature and technical challenges associated with MR imaging at field strengths above 3T.
• Analysis of how common 3T issues (e.g., B1/B0 homogeneity, SAR, contrast) impact image quality at higher fields.
• Proposal of strategies to mitigate identified challenges in ultrahigh field MR imaging.

Main Results:

• Key issues affecting image quality at ultrahigh field strengths include radiofrequency coils, B1 and B0 field homogeneity, specific absorption rate (SAR), safety considerations, altered tissue contrast, and chemical shift.
• Various technical and methodological approaches can be employed to overcome these challenges.
• Ultrahigh field MR imaging demonstrates potential applications in abdominal, pelvic, peripheral vascular, and breast imaging.

Conclusions:

• Addressing persistent challenges is essential for the successful implementation of magnetic resonance (MR) imaging at field strengths exceeding 3T.
• Innovative solutions and a potential shift in imaging paradigms are necessary to fully leverage the benefits of ultrahigh field MR.
• Ultrahigh field MR imaging holds promise for enhancing diagnostic capabilities across various clinical specialties.