Ultra-high field MRI (3 teslas and more)
After reading this chapter, you should be able:
- To state the consequences of increasing the magnetic field on signal-to-noise ratio, relaxation times, SAR, artifacts, acoustic noise
- Describe the necessary adaptations in sequence parameters and equipment
- Set out the advantages and disadvantages of increasing magnetic field
- List the potential fields of application of ultra high field MRI
3,0 T vs
|Advantages & Applications||Disadvantages & Solutions|
↑ image quality
↑ spatial resolution
↑ blood/tissue contrast
↑ TR or ↓ signal
Magnetization preparation (inversion, MP…)
Drop in signal
RF energy deposited (SAR limit)
↑ differences in resonance frequency
Better fat suppression
Chemical shift artifacts
Greater sensitivity to magnetic susceptibility
Better detection of hemorrhages
Magnetic susceptibility artifacts
RF heterogeneities, variable signal loss in the image
Optimization of coils,
Vacuum magnet housing
Headphones, gradient downgrade
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- Tanenbaum. Clinical 3T MR imaging: mastering the challenges. Magnetic resonance imaging clinics of North America. 2006 Feb;14(1):1-15.
- Heidemann, Seiberlich. Perspectives and limitations of parallel MR imaging at high field strengths. Neuroimaging clinics of North America. 2006 May;16(2):311-20, xi.
- Voss, Zevin. Functional MR imaging at 3.0 T versus 1.5 T: a practical review. Neuroimaging clinics of North America. 2006 May;16(2):285-97, x.
- Merkle and Dale. Abdominal MRI at 3.0 T: the basics revisited. Ajr. 2006 Jun;186(6):1524-32.
- Mosher. Musculoskeletal imaging at 3T: current techniques and future applications. Magnetic resonance imaging clinics of North America. 2006 Feb;14(1):63-76.
- Gutberlet, Noeske. Comprehensive cardiac magnetic resonance imaging at 3.0 Tesla: feasibility and implications for clinical applications. Investigative radiology. 2006 Feb;41(2):154-67.