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Multi-target and multi-stage liver lesion segmentation and detection in multi-phase computed tomography scans

Multi-phase computed tomography (CT) scans use contrast agents to highlight different anatomical structures within the body to improve the probability of identifying and detecting anatomical structures of interest and abnormalities such as liver lesions. Yet, detecting these lesions remains a challe...

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Published in:arXiv.org 2024-04
Main Authors: Al-Battal, Abdullah F, Duong, Soan T M, Van Ha Tang, Tran, Quang Duc, Truong, Steven Q H, Phan, Chien, Nguyen, Truong Q, An, Cheolhong
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creator Al-Battal, Abdullah F
Duong, Soan T M
Van Ha Tang
Tran, Quang Duc
Truong, Steven Q H
Phan, Chien
Nguyen, Truong Q
An, Cheolhong
description Multi-phase computed tomography (CT) scans use contrast agents to highlight different anatomical structures within the body to improve the probability of identifying and detecting anatomical structures of interest and abnormalities such as liver lesions. Yet, detecting these lesions remains a challenging task as these lesions vary significantly in their size, shape, texture, and contrast with respect to surrounding tissue. Therefore, radiologists need to have an extensive experience to be able to identify and detect these lesions. Segmentation-based neural networks can assist radiologists with this task. Current state-of-the-art lesion segmentation networks use the encoder-decoder design paradigm based on the UNet architecture where the multi-phase CT scan volume is fed to the network as a multi-channel input. Although this approach utilizes information from all the phases and outperform single-phase segmentation networks, we demonstrate that their performance is not optimal and can be further improved by incorporating the learning from models trained on each single-phase individually. Our approach comprises three stages. The first stage identifies the regions within the liver where there might be lesions at three different scales (4, 8, and 16 mm). The second stage includes the main segmentation model trained using all the phases as well as a segmentation model trained on each of the phases individually. The third stage uses the multi-phase CT volumes together with the predictions from each of the segmentation models to generate the final segmentation map. Overall, our approach improves relative liver lesion segmentation performance by 1.6% while reducing performance variability across subjects by 8% when compared to the current state-of-the-art models.
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subjects Abnormalities
Computed tomography
Contrast agents
Encoders-Decoders
Lesions
Liver
Multiphase
Neural networks
Phases
Segmentation
State of the art
Tomography
title Multi-target and multi-stage liver lesion segmentation and detection in multi-phase computed tomography scans
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