Related Experiment Videos
Fast multiplanar spoiled gradient-recalled imaging of the liver: pulse sequence optimization and comparison with
R N Low1, I R Francis, R J Herfkens
1Department of Diagnostic Radiology and Nuclear Medicine, Stanford University Medical Center, CA 94305.
AJR. American Journal of Roentgenology
|March 1, 1993
Summary
Fast multiplanar spoiled gradient-recalled (FMPSPGR) imaging significantly improves liver lesion detection and image quality compared to standard MRI sequences. This rapid, breath-hold technique offers superior contrast-to-noise ratios, enhancing diagnostic accuracy for hepatic tumors.
Area of Science:
- Radiology
- Medical Imaging
- Magnetic Resonance Imaging
Background:
- Conventional spin-echo MRI sequences can be time-consuming for liver imaging.
- Optimizing rapid acquisition sequences is crucial for improving diagnostic efficiency and patient comfort.
Purpose of the Study:
- To optimize a novel fast multiplanar spoiled gradient-recalled (FMPSPGR) imaging sequence for breath-hold liver MRI.
- To compare the efficacy of unenhanced and contrast-enhanced FMPSPGR imaging against standard spin-echo techniques for detecting liver tumors.
Main Methods:
- The FMPSPGR pulse sequence was optimized using various parameters in a healthy volunteer at 1.5 T.
- Signal-to-noise and contrast-to-noise ratios were measured to assess lesion detectability.
- 24 patients with hepatic masses underwent imaging with optimized FMPSPGR (unenhanced and contrast-enhanced) and standard spin-echo sequences.
Main Results:
- Unenhanced FMPSPGR demonstrated a 40% improvement in mean contrast-to-noise ratio and a 70% improvement in liver signal-to-noise ratio over spin-echo T1-weighted images.
- Contrast-enhanced FMPSPGR showed superior contrast-to-noise ratios in 68% of hepatic lesions compared to spin-echo T1- and T2-weighted images.
- Radiologists preferred the overall image quality of contrast-enhanced FMPSPGR, though lesion conspicuity and specificity varied.
Conclusions:
- FMPSPGR is an ultrafast MR sequence providing T1-weighted liver images during suspended respiration.
- The sequence significantly enhances contrast-to-noise and liver signal-to-noise ratios compared to conventional spin-echo T1-weighted imaging.
- Contrast-enhanced breath-hold FMPSPGR is an excellent technique for rapid liver evaluation, offering superior image quality and serving as a valuable adjunct to conventional MRI.