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Liver CT: a practical approach to dynamic contrast enhancement
M R Ditchfield1, R N Gibson, N Fairlie
1Royal Melbourne Hospital, Department of Radiology, Victoria, Australia.
Australasian Radiology
|August 1, 1992
Summary
This study found that 100 ml of contrast material provides superior liver enhancement and lesion detection during dynamic incremental computed tomography (CT). Protocols using 100 ml contrast are recommended for optimal liver imaging.
Area of Science:
- Radiology
- Medical Imaging
- Hepatobiliary Imaging
Background:
- Dynamic incremental computed tomography (CT) is crucial for liver imaging.
- Optimizing contrast administration protocols is essential for maximizing diagnostic accuracy.
Purpose of the Study:
- To establish a practical and simple protocol for high-quality dynamic incremental CT of the liver.
- To evaluate different contrast volumes and injection methods for optimal hepatic enhancement and lesion detection.
Main Methods:
- Ninety patients were randomized into six dynamic incremental CT protocols for the liver.
- Protocols varied in contrast volume (50 ml vs. 100 ml), injection method (pump vs. bolus + pump vs. bolus), and scanning direction.
- Hepatic parenchymal and venous enhancement, and aortic-IVC difference were measured in Hounsfield units.
Main Results:
- Protocols using 100 ml of contrast yielded approximately double the hepatic parenchymal and venous enhancement compared to 50 ml.
- Examinations with 100 ml contrast achieved 60-90% optimal scan phases for lesion detection, versus 13-33% with 50 ml.
- Satisfactory results were achieved with a power injector and bolus, comparable to an angiography infusion pump.
Conclusions:
- A 100 ml contrast volume is superior for dynamic incremental CT of the liver.
- Optimized protocols enhance image quality and improve detection of focal liver lesions.
- Practical and cost-effective contrast delivery methods can achieve high-quality liver CT imaging.