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Benkhedah, Nadia; Hoffmann, Stefan H.; Biller, Armin; Nagel, Armin M.

Evaluation of adaptive combination of 30‐channel head receive coil array data in 23Na MR imaging

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  • Medientyp: E-Artikel
  • Titel: Evaluation of adaptive combination of 30‐channel head receive coil array data in 23Na MR imaging
  • Beteiligte: Benkhedah, Nadia; Hoffmann, Stefan H.; Biller, Armin; Nagel, Armin M.
  • Erschienen: Wiley, 2016
  • Erschienen in: Magnetic Resonance in Medicine, 75 (2016) 2, Seite 527-536
  • Sprache: Englisch
  • DOI: 10.1002/mrm.25572
  • ISSN: 0740-3194; 1522-2594
  • Schlagwörter: Radiology, Nuclear Medicine and imaging
  • Entstehung:
  • Anmerkungen:
  • Beschreibung: <jats:sec><jats:title>Purpose</jats:title><jats:p>The aim was to optimally combine multichannel coil array data in sodium (<jats:sup>23</jats:sup>Na) MRI.</jats:p></jats:sec><jats:sec><jats:title>Methods</jats:title><jats:p><jats:sup>23</jats:sup>Na MRI was conducted on a 3 Tesla MR system using a 30‐channel head receive coil array. The parameters used for the adaptive combination (ADC) reconstruction of the low signal‐to‐noise ratio (SNR) dataset have been optimized by finding the maximum mean SNR. A pseudo multiple‐replica approach has been used to obtain SNR maps of the combined images. To prove reproducibility of the combination algorithm, the procedure was repeated for several measurements.</jats:p></jats:sec><jats:sec><jats:title>Results</jats:title><jats:p>For low SNR data, sum‐of‐squares (SOS) reconstruction leads to high background noise and a signal bias in the imaged object. The ADC reconstruction clearly reduces noise in the image and leads to an increase of the mean SNR in the range of 8% to 50%, compared to weighted SOS depending on the absolute SNR of the image. The evaluation of the effects of different noise scans showed that a small number of projections can be used to estimate noise statistics of the coil array without substantially decreasing the resulting SNR.</jats:p></jats:sec><jats:sec><jats:title>Conclusion</jats:title><jats:p><jats:sup>23</jats:sup>Na MRI can be markedly improved by using a 30‐channel receive array and ADC reconstruction. The ADC reconstruction showed robust results for all measurements without the need for sensitivity maps. Magn Reson Med 75:527–536, 2016. © 2015 Wiley Periodicals, Inc.</jats:p></jats:sec>