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Related Experiment Videos

Are TrueFISP images T2/T1-weighted?

Teng-Yi Huang1, Ing-Jye Huang, Cheng-Yu Chen

  • 1Department of Electrical Engineering, National Taiwan University, Taipei, ROC.

Magnetic Resonance in Medicine
|September 28, 2002
PubMed
Summary
This summary is machine-generated.

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TrueFISP (true fast imaging with steady-state precession) MRI images may not solely show T(2)/T(1)-weighting. Transient-state signals can dominate contrast, influenced by imaging parameters like phase-encoding matrix size.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biomedical Engineering
  • Radiology

Background:

  • TrueFISP (true fast imaging with steady-state precession) is a widely used MRI technique.
  • It is generally assumed to produce T(2)/T(1)-weighted images.
  • The half-flip-angle preparation scheme is common in TrueFISP imaging.

Purpose of the Study:

  • To investigate the influence of transient-state signal behavior on TrueFISP image contrast.
  • To determine if the commonly assumed T(2)/T(1)-weighting accurately represents TrueFISP image characteristics.
  • To assess how imaging parameters affect the contrast observed in TrueFISP images.

Main Methods:

  • Acquisition of 2D human brain images using the TrueFISP technique.
  • Employing various phase-encoding matrix sizes to study transient-state signal dynamics.

Related Experiment Videos

  • Comparison of experimental results with theoretical predictions.

    • Main Results:

    • Transient-state signal response can significantly impact TrueFISP image contrast.
    • Contrast between gray and white matter shifted from proton-density- to T(2)/T(1)-weighted as phase-encoding matrix size increased.
    • Observed contrast changes align with theoretical predictions.

    Conclusions:

    • TrueFISP images exhibit a combination of proton-density and T(2)/T(1) contrast, particularly under specific imaging conditions.
    • The transient-state response plays a crucial role in determining the final image contrast.
    • Caution is advised when interpreting tissue characteristics from TrueFISP images in clinical settings due to the complex contrast mechanisms.