Ultrahigh field MRI
Last revised by Daniel J Bell on 27 Apr 2024
Citation, DOI, disclosures and article data
Citation:
Bell D, Jones J, Moore C, et al. Ultrahigh field MRI. Reference article, Radiopaedia.org (Accessed on 15 May 2024) https://doi.org/10.53347/rID-69050
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rID:
69050
Article created:
26 Jun 2019,
Daniel J Bell ◉
Disclosures:
At the time the article was created Daniel J Bell had no recorded disclosures.
View Daniel J Bell's current disclosures
Last revised:
27 Apr 2024,
Daniel J Bell ◉
Disclosures:
At the time the article was last revised Daniel J Bell had no financial relationships to ineligible companies to disclose.
View Daniel J Bell's current disclosures
Revisions:
8 times, by
4 contributors -
see full revision history and disclosures
Systems:
Sections:
Tags:
Synonyms:
- 9 T MRI
- 9.0 T MRI
- 9.0 tesla
- 7 tesla magnetic resonance imaging
- 7T MRI
- 9T MRI
- 7 T MR
- 7T MR
- Seven tesla MR
- 7.0 T MR
- Ultra-high field (UHF) magnetic resonance imaging
- Ultra-high field (UHF) MRI
- Ultra high field (UHF) MRI
- Ultrahigh field (UHF) MRI
- Ultra-high field (UHF) NMR
- Ultra-high field (UHF) nuclear magnetic resonance
- 7 tesla MRI
- 7 T MRI
- 7.0 tesla MRI
- 7.0 T MRI
- Very high field MRI
- 7.0 tesla MR
- Nine tesla MRI
- Seven tesla MRI
- 8 T MRI
- Eight tesla MRI
Ultrahigh field (UHF) magnetic resonance imaging refers to imaging done on any MRI scanner with a main magnetic field (B0) strength of 7 tesla or greater. The first 7 T clinical scanner was introduced in 2017, and there are an ever increasing number of academic centers worldwide with ultrahigh field scanners in clinical use. Several research scanners with even higher field strength than 7 T are in operation 1.
Advantages
-
increased signal-to-noise ratio (SNR)
increased spatial resolution
increased contrast resolution
decreased acquisition time
-
increased magnetic susceptibility
-
increased T1 relaxation time
improved time of flight (TOF) MRA
-
decreased T2/T2* relaxation time
improved BOLD, SWI
Disadvantages
increase in side effects: dizziness, nausea, metallic dysgeusia, vertigo 1,2
-
increased magnetic susceptibility
image degradation artifacts
-
increased specific absorption rate (SAR)
smaller flip angles, longer TRs, prolonged breath holds, decreased slices
-
increased T1 relaxation time
prolonged acquisition time
-
decreased T2/T2* relaxation time
increased data may become computationally heavy
References
- 1. Ladd M, Bachert P, Meyerspeer M et al. Pros and Cons of Ultra-High-Field MRI/MRS for Human Application. Progress in Nuclear Magnetic Resonance Spectroscopy. 2018;109:1-50. doi:10.1016/j.pnmrs.2018.06.001
- 2. Heilmaier C, Theysohn J, Maderwald S, Kraff O, Ladd M, Ladd S. A Large-Scale Study on Subjective Perception of Discomfort During 7 and 1.5 T MRI Examinations. Bioelectromagnetics. 2011;32(8):610-9. doi:10.1002/bem.20680
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