Localized magnetic resonance spectroscopy (MRS) as well as magnetic resonance imaging (MRI) require both maximal signal-to-noise ratio (SNR) and radio frequency (rf) field (B1) homogeneity. While MRI allows the application of post-processing methods, such as correction of image intensity to correct B1 inhomogeneities, MRS is more demanding from this point of view leaving very little opportunity for post-processing and requiring mostly hardware improvement. In addition, due to the smaller volume of interest (VOI) and particularly low metabolite concentration, there is less signal available in MRS than in MRI. The time required to obtain good spectra is long pushing the SNR requirements to the limits.
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Abbreviations
- SNR:
-
signal-to-noise ratio
- B 1 :
-
rf field
- M 0 :
-
magnetization
- μ0:
-
permeability of free space
- Q :
-
quality factor of the coil
- K :
-
numerical factor depending on the coil geometry
- η:
-
filling factor
- ω0:
-
Larmor frequency
- V c :
-
volume of the coil
- F :
-
noise figure of the preamplifier
- k :
-
Boltzmann constant
- T c :
-
probe temperature
- Δf:
-
bandwidth (in Hertz) of the receiver
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Tomanek, B. (2008). Radio Frequency Coils for Magnetic Resonance Spectroscopy. In: Webb, G.A. (eds) Modern Magnetic Resonance. Springer, Dordrecht. https://doi.org/10.1007/1-4020-3910-7_126
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DOI: https://doi.org/10.1007/1-4020-3910-7_126
Publisher Name: Springer, Dordrecht
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