Related Experiment Videos
Central nervous system tumor, infection, and infarction: detection with gadolinium-enhanced magnetization transfer MR
R C Mehta1, G B Pike, S P Haros
1Department of Radiology, Stanford University Medical Center, CA 94305-5105.
Purpose:
To quantitatively measure the degree of contrast enhancement of central nervous system (CNS) tumor, infection, and infarction by means of magnetization transfer (MT) magnetic resonance (MR) imaging.
Materials And Methods:
T1-weighted MR images obtained before and after administration of contrast material with and without MT in 14 patients with CNS tumors were evaluated by means of a contrast-to-noise ratio (C/N). Another 72 patients with a variety of lesions underwent contrast material-enhanced T1-weighted MR imaging prospectively with and without MT; C/N was also evaluated.
Results:
All lesions had a higher C/N on T1-weighted postcontrast MT images than on conventional images. C/N was 65 +/- 5 (mean +/- standard error) for MT and 42 +/- 4 for conventional images. C/N improved by a factor of 1.6-2.1 in the three disease categories. In intracranial tumors, the MT technique itself did not contribute significantly (P < .001) to the increase in C/N in the absence of gadopentetate dimeglumine. In fact, the C/N was lower for nonenhanced T1-weighted MT images.
Conclusion:
Concurrent use of gadopentetate dimeglumine and MT results in a statistically significant (P < .001) increase in C/N in CNS tumor, infection, and infarction.
Insights
Magnetization transfer (MT) magnetic resonance (MR) imaging significantly enhances contrast in central nervous system (CNS) lesions. This technique improves lesion visualization for tumors, infections, and infarctions.
Area of Science:
- Radiology and Medical Imaging
- Neuroimaging Techniques
- Advanced MRI Applications
Background:
- Central nervous system (CNS) lesions require accurate imaging for diagnosis and management.
- Contrast-enhanced magnetic resonance (MR) imaging is crucial for visualizing CNS pathologies.
- Magnetization transfer (MT) is an advanced MR technique that can potentially improve image contrast.
Purpose of the Study:
- To quantitatively assess the impact of MT imaging on contrast enhancement in CNS lesions.
- To compare contrast-to-noise ratio (C/N) in CNS tumors, infections, and infarctions using MT and conventional MR imaging.
- To determine the added value of MT in conjunction with contrast agents.
Main Methods:
- T1-weighted MR images were acquired with and without MT, before and after contrast administration.
- Contrast-to-noise ratio (C/N) was calculated for lesions in 14 patients with CNS tumors.
- An additional 72 patients with various CNS lesions underwent prospective contrast-enhanced T1-weighted MR imaging with and without MT for C/N evaluation.
Main Results:
- All evaluated lesions demonstrated higher C/N on postcontrast MT images compared to conventional images.
- Mean C/N was 65 +/- 5 for MT images versus 42 +/- 4 for conventional images.
- Contrast enhancement improved by a factor of 1.6-2.1 across the three disease categories (tumor, infection, infarction).
Conclusions:
- The combined use of gadopentetate dimeglumine and MT significantly increases C/N in CNS lesions.
- MT-enhanced MR imaging provides superior contrast for visualizing CNS tumors, infections, and infarctions.
- This technique offers a statistically significant improvement in diagnostic imaging of CNS pathologies.