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Gadolinium-enhanced magnetization transfer contrast imaging of intracranial tumors
T J Kurki1, P T Niemi, N Lundbom
1Department of Diagnostic Radiology, Turku University Hospital, Finland.
Abstract:
The magnetization transfer contrast (MTC) technique was used in low-field-strength (0.1 T) magnetic resonance (MR) imaging of 28 patients with intracranial tumors. MTC images were generated with an off-resonance, low-power radio-frequency pulse applied during the interpulse delay period of a gradient-echo partial-saturation sequence (TR msec/TE msec = 200/20). Images in the presence and absence of the MTC pulse were concurrently acquired before and after injection of gadopentetate dimeglumine at a dose of 0.1 mmol/kg. The contrast agent enhanced 27 of 28 tumors. Application of the MTC pulse improved the contrast-to-noise ratio (C/N) between tumor and normal white matter in 26 of 28 cases on the preinjection images and in 25 of 28 cases on the postinjection images. On the gadolinium-enhanced images, the mean C/N was 2.6 +/- 1.7 without the MTC pulse and 3.2 +/- 1.9 with the MTC pulse. The greatest contrast improvement with the MTC technique was obtained in tumors showing the strongest paramagnetic enhancement. The results indicate that MTC can improve contrast between normal brain and some intracranial neoplasms. The use of gadopentetate dimeglumine generally intensified this effect.
Insights
Magnetization transfer contrast (MTC) imaging improves tumor visualization in low-field MRI. This technique enhances contrast-to-noise ratios, aiding in the detection of intracranial tumors, especially after contrast agent administration.
Area of Science:
- Medical Imaging
- Neuroimaging
- Biophysics
Background:
- Intracranial tumors present diagnostic challenges in magnetic resonance (MR) imaging.
- Optimizing contrast-to-noise ratio (C/N) is crucial for accurate tumor detection and characterization.
- Low-field-strength MRI requires advanced techniques to achieve diagnostic image quality.
Purpose of the Study:
- To evaluate the efficacy of magnetization transfer contrast (MTC) in enhancing intracranial tumor visualization.
- To assess the impact of MTC on contrast-to-noise ratio (C/N) in low-field (0.1 T) MR imaging.
- To determine if MTC improves tumor detection before and after gadolinium-based contrast agent administration.
Main Methods:
- Magnetization transfer contrast (MTC) technique applied to 0.1 T gradient-echo partial-saturation MR sequences.
- Concurrent acquisition of MTC and non-MTC images in 28 patients with intracranial tumors.
- Images acquired before and after intravenous injection of gadopentetate dimeglumine (0.1 mmol/kg).
Main Results:
- MTC improved C/N between tumor and normal white matter in 26/28 pre-contrast and 25/28 post-contrast scans.
- Gadolinium contrast enhanced 27/28 tumors.
- Mean C/N increased from 2.6 +/- 1.7 (without MTC) to 3.2 +/- 1.9 (with MTC) on enhanced images.
- Greatest contrast improvement observed in tumors with strong paramagnetic enhancement.
Conclusions:
- Magnetization transfer contrast (MTC) is effective in improving contrast between intracranial neoplasms and normal brain tissue at low-field MRI.
- The addition of MTC enhances the diagnostic utility of MR imaging for brain tumors.
- Gadolinium-based contrast agents generally potentiate the contrast-enhancing effects of MTC.
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