FASTMAP

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FASTMAP is a shimming technique based on measuring B0 field plots along projections instead of mapping whole imaging planes with the benefit of improved speed and performance.

Background literature

Note that the success of this shim procedure assumes that your specific localization sequence is devoid of any eddy current effects. If eddy currents persist as can be judged from convergence of FASTMAP and substantial linewidths and -distortions in the localized sequence, manual adjustment of liner shims should provide substantial improvement. Proper adjustment of eddy current compensation is highly recommended however. See e.g. Terpstra et al. J. Magn. Reson. 131:139 1998 and refs therein [PDF file (120k)].

License

Obtaining a license

The available supported software versions are listed below. If you are interested in obtaining these sequences, please follow this process to obtain a CMRR license:

  1. Select the license from the OTC website and complete the license agreement.
  2. CMRR will send you your account information and instructions for downloading the software.

Please note that the entire licensing process may take up to two weeks to process.

Once you have executed a Material Transfer Agreement and have been given an access password, the software can be downloaded here by selecting the desired release number.

Citation

If you publish or present results obtained using the software or sequences in this package, please acknowledge the researchers who developed the sequences using the following language:

Gruetter R. Automatic, localized in vivo adjustment of all first- and second-order shim coils. Magn Reson Med. 1993; 29:804-11. doi: 10.1002/mrm.1910290613

Gruetter R and Tkác I. Field mapping without reference scan using asymmetric echo-planar techniques. Magn Reson Med. 2000; 43:319-23. doi: 10.1002/(sici)1522-2594(200002)43:2<319::aid-mrm22>3.0.co;2-1

Contact

If you have noticed a bug or have a request for a new feature in a future release, please contact Ivan Tkac. Be sure to include the sequence variant and the model of scanner you are using in the problem description.

Download

Version 1

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References

  1. Gruetter R. Automatic, localized in vivo adjustment of all first- and second-order shim coils. Magn Reson Med. 1993; 29:804-11. doi: 10.1002/mrm.1910290613
  2. Gruetter R and Tkác I. Field mapping without reference scan using asymmetric echo-planar techniques. Magn Reson Med. 2000; 43:319-23. doi: 10.1002/(sici)1522-2594(200002)43:2<319::aid-mrm22>3.0.co;2-1

  3. Rolf Gruetter, Chris Boesch, Fast, noniterative shimming of spatially localized signals. In vivo analysis of the magnetic field along axes, Journal of Magnetic Resonance (1992), Volume 96, Issue 2, 1992, Pages 323-334, ISSN 0022-2364, https://doi.org/10.1016/0022-2364(92)90085-L.

  4. Shen J, et al. Improvements on an in vivo automatic shimming method [FASTERMAP]. Magn Reson Med. 1997; 38:834-9. doi: 10.1002/mrm.1910380521
  5. Gruetter R, et al. Resolution improvements in in vivo 1H NMR spectra with increased magnetic field strength. J Magn Reson. 1998; 135:260-4. doi: 10.1006/jmre.1998.1542
  6. Terpstra M, et al. Localized eddy current compensation using quantitative field mapping. J Magn Reson. 1998; 131:139-43. doi: 10.1006/jmre.1997.1353
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