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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
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Author Spotlight: A Non-Invasive Tool to Assess and Differentiate Fat Patterns in Liver Using 3D Dixon MRI
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Fat suppression for ultrashort echo time imaging using a single-point Dixon method.

Hyungseok Jang1, Michael Carl2, Yajun Ma1

  • 1Department of Radiology, University of California San Diego, San Diego, CA, USA.

NMR in Biomedicine
|February 16, 2019
PubMed
Summary
This summary is machine-generated.

A novel single-point Dixon (1p-Dixon) method enhances fat suppression in ultrashort echo time (UTE) imaging for better contrast in short T2 tissues. This technique offers improved accuracy and signal intensity compared to conventional methods.

Keywords:
DixonMSKUTEfat saturationfat suppressionsingle pointtendon

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Area of Science:

  • Magnetic Resonance Imaging
  • Biomedical Engineering

Background:

  • Ultrashort echo time (UTE) imaging is crucial for visualizing tissues with short T2* decay.
  • Fat suppression in UTE imaging improves contrast but can attenuate short T2* signals.
  • Conventional two-point Dixon (2p-Dixon) methods struggle with fat suppression in UTE due to rapid T2* decay.

Purpose of the Study:

  • To develop and evaluate a novel single-point Dixon (1p-Dixon) method for effective fat suppression in UTE imaging.
  • To improve contrast and signal-to-noise ratio (SNR) in short T2 tissues using UTE.
  • To overcome limitations of conventional fat suppression techniques in UTE imaging.

Main Methods:

  • Utilized dual-echo UTE imaging with a flexible second echo time.
  • Applied a 1p-Dixon method to non-UTE images for fat estimation after phase error correction.
  • Integrated 1p-Dixon fat estimation for fat suppression in the UTE image.
  • Conducted in vivo ankle and knee imaging at 3T.

Main Results:

  • 1p-Dixon demonstrated reliable fat and water separation, unaffected by short T2* decay, unlike 2p-Dixon.
  • The 1p-Dixon method yielded significantly higher signal intensities in Achilles, quadriceps, and patellar tendons compared to conventional fat saturation.
  • Contrast-to-noise ratios (CNRs) were substantially improved with 1p-Dixon (e.g., 26.8 ± 1.3 for patellar tendon) versus fat saturation (e.g., 17.5 ± 1.4).

Conclusions:

  • The proposed 1p-Dixon based fat suppression offers more accurate fat/water separation and flexible parameter selection in UTE imaging.
  • This method significantly enhances CNR for short T2 tissues compared to conventional fat saturation techniques.
  • 1p-Dixon is a superior alternative for fat suppression in UTE imaging, particularly for short T2 tissues.