Interactive body magnetic resonance fluoroscopy using modified single-shot half-Fourier rapid acquisition with relaxation enhancement (RARE) with multiparameter control
✍ Scribed by Malek Makki; M.J. Graves; D.J. Lomas
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- English
- Weight
- 880 KB
- Volume
- 16
- Category
- Article
- ISSN
- 1053-1807
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✦ Synopsis
Purpose:
To develop a technique for interactive fluoroscopic abdominal magnetic resonance imaging (mri) based on a single-shot half-fourier rapid acquisition and relaxation-enhanced sequence.
Materials and methods:
The sequence was modified by incorporating inner-volume excitation, driven-equilibrium signal enhancement, and reduced flip angle refocusing pulses. contrast control was provided by integrating "on-the-fly" selection of phase encoding view order, fat suppression, and section thickness. the resulting sequence was evaluated with phantom experiments to quantify the signal-to-noise ratio (snr) effects of the modifications and in healthy volunteers for imaging the bile ducts, stomach, and duodenum using water and gaseous contrast media.
Results:
Observed snr relating to driven-equilibrium and flip angle scaling matched theoretical predictions. volunteer examinations demonstrated the ability of the modified sequence to provide interactive, artifact-free imaging of the abdomen, including switching between conventional proton density-weighted, t2-weighted imaging and "hydrographic" projection imaging.
Conclusion:
Refinement of this technique may provide an abdomino-pelvic imaging capability similar in concept to real-time ultrasound, but with the advantages of mri.