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CT angiography with gadolinium-based contrast media.
Michael J Bonvento1, William H Moore, Terry M Button
1Department of Radiology, State University of New York at Stony Brook, University Hospital, HSC Level IV Room 120, Stony Brook, NY 11794, USA.
Academic Radiology
|July 18, 2006
Summary
Gadolinium-based contrast media show potential for computed tomography (CT) angiography. While initial results in live subjects showed lower contrast than iodinated media, phantom studies revealed significantly higher CT contrast for gadolinium at equivalent molar concentrations.
Area of Science:
- Radiology
- Medical Imaging
- Contrast Media Research
Background:
- Iodinated contrast media are standard for computed tomography (CT).
- Gadolinium (Gd)-based contrast media are primarily used in Magnetic Resonance Imaging (MRI).
- Investigating alternative contrast agents for CT is crucial for expanding diagnostic capabilities.
Purpose of the Study:
- To evaluate the efficacy of gadolinium-based contrast media, specifically Gadovist (a 1-molar Gd agent), in CT imaging.
- To compare the performance of Gd-based media against standard iodinated contrast media in CT.
- To assess the potential of Gd-based media for CT angiography.
Main Methods:
- Comparative CT imaging was performed on a live rabbit model and an acrylic CT body phantom.
- Images were acquired at varying kilovolt peak (kVp) settings (80, 100, 120) with fixed beam filtration.
- Serial dilutions of Gd-based (Magnevist, Gadovist) and iodinated (Ultravist) contrast media were used in phantom studies, while varying volumes were administered intravenously in animal studies.
Main Results:
- At 80 kVp, Gadovist demonstrated 40% lower aortic contrast enhancement compared to Ultravist for equivalent injection volumes in the animal study.
- Phantom studies revealed up to a fourfold increase in CT image contrast for Gd-based media versus iodine-based media at the same kVp and molar concentrations.
- These findings highlight a discrepancy in contrast enhancement between in vivo and in vitro models.
Conclusions:
- Gadolinium-based contrast media exhibit potential for clinical CT angiography applications.
- Further research is warranted to optimize Gd-based media for CT imaging and understand the observed differences in contrast enhancement.
- These results encourage continued investigation into Gd-based agents for CT diagnostics.