Automated segmentation of hepatic vessels in non-contrast X-ray CT images
Suguru Kawajiri1, Xiangrong Zhou, Xuejun Zhang
1Department of Intelligent Image Information, Division of Regeneration and Advanced Medical Sciences, Graduate School of Medicine, Gifu University, Gifu, Japan. kawajiri@fjt.info.gifu-u.ac.jp
Insights
This study presents a novel method for automatically segmenting hepatic vessels in plain CT images, crucial for computer-aided diagnosis. The approach successfully enhances and extracts these vessels, improving liver lesion detection capabilities.
Area of Science:
- Medical Imaging
- Radiology
- Computer-Aided Diagnosis
Background:
- Hepatic vessels are vital for liver analysis and computer-aided diagnosis (CAD).
- Distinguishing hepatic vessels in plain CT images is challenging due to low contrast.
- Automated segmentation of hepatic vessels in non-contrast CT is a significant hurdle.
Purpose of the Study:
- To develop and validate an automated approach for hepatic vessel segmentation in plain CT images.
- To enhance the visibility and extraction of hepatic vessels for improved liver lesion detection in CAD systems.
Main Methods:
- A two-step process involving hepatic vessel enhancement and extraction.
- Enhancement utilized Gaussian histogram transformation and multi-scale line filtering based on Hessian matrix eigenvalues.
- Extraction involved thresholding followed by removal of small false positive regions.
Main Results:
- The proposed method demonstrated the ability to enhance and segment hepatic vessels in plain CT images.
- Preliminary results showed promising performance in identifying hepatic vessels.
- Validation included quantitative metrics and subjective evaluation by a radiologist.
Conclusions:
- The developed approach offers a viable solution for automatic hepatic vessel segmentation in plain CT scans.
- This technique has the potential to improve the accuracy and efficiency of liver lesion detection in CAD systems.
Abstract:
Hepatic-vessel trees are the key structures in the liver. Knowledge of the hepatic-vessel tree is required because it provides information for liver lesion detection in the computer-aided diagnosis (CAD) system. However, hepatic vessels cannot easily be distinguished from other liver tissues in plain CT images. Automated segmentation of hepatic vessels in plain (non-contrast) CT images is a challenging issue. In this paper, an approach to automatic segmentation of hepatic vessels is proposed. The approach consists of two processing steps: enhancement of hepatic vessels and hepatic-vessel extractions. Enhancement of the vessels was performed with two techniques: (1) histogram transformation based on a Gaussian function; (2) multi-scale line filtering based on eigenvalues of a Hessian matrix. After the enhancement of the vessels, candidates of hepatic vessels were extracted by a thresholding method. Small connected regions in the final results were considered as false positives and were removed. This approach was applied to 2 normal-liver cases for whom plain CT images were obtained. Hepatic vessels segmented from the contrast-enhanced CT images of the same patient were used as the ground truth in evaluation of the performance of the proposed approach. The index of separation ratio between the CT number distributions in hepatic vessels and other liver tissue regions was also used in the evaluation. A subjective evaluation of the hepatic-vessel extraction results based on the additional 16 plain CT cases was carried out for a further validation by a radiologist. The preliminary experimental results showed that the proposed method could enhance and segment the hepatic-vessel regions even in plain CT images.
