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RARE two-point Dixon with dual bandwidths.
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- Rydén, Henric (author)
- Karolinska Institutet
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- Berglund, Johan (author)
- Karolinska Institutet
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- Norbeck, Ola (author)
- Karolinska Institutet
- show more...
- Avventi, Enrico (author)
- Sprenger, Tim (author)
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- (creator_code:org_t)
- 2020-04-25
- 2020
- English.
- In: Magnetic Resonance in Medicine. - : Wiley. - 0740-3194 .- 1522-2594. ; 84:5, s. 2456-2468
- Journal article (peer-reviewed)
Abstract
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- PURPOSE: To investigate the impact of dual readout bandwidths (dBW) in a dual echo fat/water acquisition and describe a dBW-rapid acquisition relaxation enhanced, or turbo spin echo sequence where the concept is used to improve SNR by removing dead times between refocusing pulses and avoiding redundant Chemical-shift encoded.METHODS: Cramér-Rao bounds and Monte Carlo simulations were used to investigate a two-point fat/water model where the difference in bandwidths is incorporated. In vivo images were acquired at 1.5 and 3 T with the dBW-rapid acquisition relaxation enhanced, or turbo spin echo sequence. Typical bandwidth ratios were 1:2. SNR was compared with a single bandwidth sequence under identical scan parameters at 3T.RESULTS: Monte Carlo simulations and Cramér-Rao analysis demonstrate that number of signal averages can be improved with dual bandwidths compared to conventional single bandwidth acquisitions. The dBW-rapid acquisition relaxation enhanced, or turbo spin echo sequence can acquire images with high readout resolutions with well-conditioned sampling. An SNR improvement of 52% was measured, in line with the theoretical gain of 54%.CONCLUSIONS: The proposed dBW-rapid acquisition relaxation enhanced, or turbo spin echo sequence is a highly SNR-efficient two-point rapid acquisition relaxation enhanced, or turbo spin echo sequence without dead times, and can acquire images at higher resolutions than current vendor-supplied alternatives.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Radiologi och bildbehandling (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Radiology, Nuclear Medicine and Medical Imaging (hsv//eng)
Keyword
- Cramér-Rao bound
- Dixon
- Monte Carlo
- NSA
- RARE
- chemical shift
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- ref (subject category)
- art (subject category)
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- Rydén, Henric
- Berglund, Johan
- Norbeck, Ola
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- Skare, Stefan
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- MEDICAL AND HEALTH SCIENCES
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- Uppsala University
- Karolinska Institutet
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