J Korean Med Assoc.  2010 Dec;53(12):1055-1058. 10.5124/jkma.2010.53.12.1055.

Introduction to high field strength magnetic resonance imaging

• Kim JH

• KMID: 2064720
• DOI: http://doi.org/10.5124/jkma.2010.53.12.1055

Abstract

Recently 3 tesla (T) magnetic resonance imaging (MRI) has been increasingly used in the clinical field. 3T MRI has many advantages, such as a better signal-to-noise ratio, increased chemical shift, and increased susceptibility, whereas it has several disadvantages such as increased relaxation time, radiofrequency field inhomogeneity, and increased specific absorption rate. The awareness of these advantages and disadvantages of 3T MRI will lead to better outcomes in clinical and research applications.

Keyword

Magnetic resonance imaging; High field strength; 3 tesla; Advantage; Disadvantage

MeSH Terms

Absorption
Imidazoles
Magnetic Resonance Imaging
Magnetic Resonance Spectroscopy
Magnetics
Magnets
Nitro Compounds
Relaxation
Signal-To-Noise Ratio
Imidazoles
Nitro Compounds

Figure

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  Figure 1 Better signal-to-noise ratio at 3 tesla (T). Fluid attenuated inversion recovery image obtained at 1.5T (A) looks more coarse than the image at 3T (B) in the same patient, reflecting the better signal-to-noise ratio at 3T.

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  Figure 2 Better spatial resolution at 3 tesla (T). On magnified angiographic images of the right middle cerebral artery at 1.5T (A) and 3T (B) in the same patient, more detailed anatomical resolution is achieved at 3T.

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  Figure 3 Increased susceptibility at 3 tesla (T). Compared with gradient-echo image obtained at 1.5T (A), the image at 3T (B) of the same patient shows more clearly defined dark dots (microbleeds) in the thalamus, and more conspicuous dark signal intensity (iron deposit) of the basal ganglia, suggesting the increased susceptibility at 3T.

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  Figure 4 Increased B1 inhomogeneity. Fat-suppressed T2-weighted image of the liver shows a large-sized signal loss (arrows) in the left lobe area due to an artifact caused by the inhomogeneous radiofrequency field.

Reference

1. Kim DH, Kim DH, Huh YM. Korean Socity of Magnetic Resonance in Medicine. High tesla MRI. Magnetic resonanace imaging. 2008. Seoul: Iljogak;341–354.

2. Schmitz BL, Aschoff AJ, Hoffmann MH, Grön G. Advantages and pitfalls in 3T MR brain imaging: a pictorial review. AJNR Am J Neuroradiol. 2005. 26:2229–2237.

3. Frayne R, Goodyear BG, Dickhoff P, Lauzon ML, Sevick RJ. Magnetic resonance imaging at 3.0 Tesla: challenges and advantages in clinical neurological imaging. Invest Radiol. 2003. 38:385–402.

4. Bernstein MA, Huston J 3rd, Lin C, Gibbs GF, Felmlee JP. High-resolution intracranial and cervical MRA at 3.0T: technical considerations and initial experience. Magn Reson Med. 2001. 46:955–962.

5. Barker PB, Hearshen DO, Boska MD. Single-voxel proton MRS of the human brain at 1.5T and 3.0T. Magn Reson Med. 2001. 45:765–769.