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Related Experiment Videos

Optimizing fast spin echo acquisitions for hepatic imaging in normal subjects

C E Spritzer1, M T Keogan, D M DeLong

  • 1Department of Radiology, Duke University Medical Center, Durham, North Carolina, USA.

Journal of Magnetic Resonance Imaging : JMRI
|January 1, 1996
PubMed
Summary

Respiratory triggering (RT) with fast spin-echo (FSE) liver imaging, using flow compensation and an 8 echo train length (ETL), is preferred by observers. This optimized FSE sequence offers significant time savings compared to conventional spin-echo methods.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Magnetic Resonance Imaging

Background:

  • T2-weighted fast spin-echo (FSE) sequences are crucial for liver imaging.
  • Optimizing FSE parameters is essential for improving image quality and reducing scan times.
  • Observer preference is a key metric for evaluating diagnostic imaging sequences.

Purpose of the Study:

  • To identify the optimal implementation of T2-weighted FSE liver sequences based on observer preference.
  • To compare various FSE sequence modifications against conventional spin-echo techniques.
  • To assess the impact of specific parameters like flow compensation, respiratory triggering (RT), and echo train length (ETL) on image quality.

Main Methods:

  • Five volunteers underwent liver imaging using multiple FSE sequences with variations in flow compensation, RT, ECG triggering, randomized phase encoding (RPE), breath-holding, and ETL.

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  • Images were compared to conventional spin-echo sequences by two blinded observers.
  • Quantitative analysis included signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR).

    • Main Results:

    • The most preferred FSE sequence incorporated flow compensation, RT, and an 8 ETL.
    • RT was the most significant factor influencing image preference, SNR, and CNR (P < .01).
    • Images with an 8 ETL were marginally preferred over 16 ETL (P = .07), and flow compensation in the frequency direction showed some preference.

    Conclusions:

    • Optimized T2-weighted FSE liver imaging using RT, flow compensation (frequency direction), and an 8 ETL achieves image quality comparable to conventional spin-echo sequences.
    • This optimized FSE approach offers substantial time savings.
    • RT is the critical parameter for enhancing FSE liver image quality and observer preference.