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CT portography by multidetector helical CT: comparison of three rendering models
Yoshiharu Nakayama1, Masanori Imuta, Yoshinori Funama
1Department of Radiology, Kumamoto University School of Medicine, Japan.
Radiation Medicine
|January 30, 2003
Summary
Multidetector CT portography offers superior visualization of portosystemic collaterals compared to conventional methods. Minimum intensity projection (MIP) rendering provides the best imaging results for these collaterals.
Area of Science:
- Radiology
- Medical Imaging
- Hepatology
Background:
- Portal hypertension is a serious complication of liver disease.
- Portosystemic collateral formation is a key feature of portal hypertension.
- Accurate visualization of collaterals is crucial for treatment planning.
Purpose of the Study:
- To evaluate multidetector CT portography for visualizing varices and portosystemic collaterals.
- To compare multidetector CT portography with conventional portography.
- To compare three CT rendering techniques: volume rendering (VR), minimum intensity projection (MIP), and shaded surface display (SSD).
Main Methods:
- 46 patients with portal hypertension underwent CT portography using a multidetector CT scanner.
- CT portography involved a slice thickness of 2.5 mm and table feed of 7.5 mm.
- Three rendering models (VR, MIP, SSD) were generated and compared to transarterial portography.
Main Results:
- Multidetector CT identified 48 collaterals, while transarterial portography detected 38.
- MIP visualized 44 of the 48 CT-identified collaterals.
- VR and SSD visualized 34 and 29 collaterals, respectively.
Conclusions:
- Multidetector CT portography provides excellent visualization of portosystemic collaterals.
- MD-CT portography images are superior to transarterial portography.
- MIP rendering offers the best visualization of portosystemic collaterals among the tested techniques.