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Related Experiment Videos

FAST sequences optimization for contrast media pharmacokinetic quantification in tissue.

M K Ivancevic1, I Zimine, F Lazeyras

  • 1Department of Radiology, Geneva University Hospital, Geneva, Switzerland. marko.ivancevic@physics.unige.ch

Journal of Magnetic Resonance Imaging : JMRI
|December 18, 2001
PubMed
Summary

Optimizing magnetic resonance (MR) imaging sequences, specifically fast gradient-recalled echo (GRE) parameters, enhances contrast dynamics and signal sensitivity for accurate pharmacokinetic assessment. The study identified optimal settings for different sequences to improve gadolinium-based contrast agent evaluation.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Magnetic Resonance Imaging (MRI)

Background:

  • Accurate pharmacokinetic assessment using contrast media is crucial in MRI.
  • Optimization of fast gradient-recalled echo (GRE) sequence parameters is necessary to improve contrast dynamic range and signal sensitivity.
  • Understanding the influence of sequence parameters on image quality and quantitative analysis is essential for reliable results.

Purpose of the Study:

  • To investigate the impact of fast GRE sequence parameters on contrast dynamic range and signal sensitivity.
  • To optimize MR sequences for enhanced contrast media pharmacokinetic assessment.
  • To compare the performance of Fast low-angle shot (FLASH), Fast acquisition at steady rate (FAST), and radiofrequency-spoiled (RF)-FAST sequences.

Main Methods:

Related Experiment Videos

  • In vitro study evaluating the effects of FLASH, FAST, and RF-FAST sequence parameters.
  • Analysis of contrast dynamic range and signal sensitivity with varying flip angles, echo times (TE), and inversion times (TI).
  • Assessment of image artifacts, specifically side bands in FLASH sequences.

Main Results:

  • The FAST sequence demonstrated the highest sensitivity at low gadolinium (Gd) concentrations.
  • FLASH and RF-FAST sequences offered a larger contrast dynamic range, though FLASH sequences exhibited side band artifacts.
  • Increasing the flip angle to 90 degrees improved FAST sequence sensitivity and RF-FAST sequence contrast dynamic range. Shortest TE was optimal for contrast dynamics and imaging time.

Conclusions:

  • Optimal parameters for contrast dynamics were identified as RF-FAST sequence with a 90-degree flip angle and the shortest possible TE.
  • Optimal parameters for sensitivity were determined to be FAST sequence with a 90-degree flip angle and a long effective TI (TI(eff)).
  • The study provides guidance for selecting appropriate MR sequence parameters to optimize contrast media assessment in clinical and research settings.