Level Set Based on Brain Radiological Densities for Stroke Segmentation in CT Images

Elizângela de S. Rebouças, Alan M. Braga, R. Sarmento, R. Marques, P. Filho
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引用次数: 14

Abstract

Cardiovascular diseases (CVD) are the leading cause of death worldwide, and every year more people die of these diseases. Aiming to assist medical diagnoses through Computerized Tomography (CT) scans, this work proposes a new approach to segment CT images of the brain damaged by stroke. The proposed method takes into account two improvements of the level set method based on the likelihood of Normal distribution. The first improvement is to handle the grayscale image input according to a range analysis of the image intensity scale, adopting 80 HU for the window width and 40 HU for the center level. In addition, we propose an optimal level set initialization, where the zero level set is determined by analyzing the brain density. These improvements to the level set method generate efficient stroke segmentation in CT images of the brain. The results of the proposed method are compared against those of the level set algorithm based on the coherent propagation method, and also those from the Watershed and Region Growing algorithms using a ground truth built by a specialist. The experimental results show that the proposed method presents superior performance, and that it is a promising tool to assist medical diagnoses.
基于脑放射密度水平集的CT图像脑划分割
心血管疾病(CVD)是世界范围内死亡的主要原因,每年都有更多的人死于这些疾病。为了通过计算机断层扫描(CT)辅助医学诊断,本研究提出了一种新的方法来分割脑卒中损伤的CT图像。该方法考虑了基于正态分布似然的水平集方法的两个改进。第一个改进是根据图像强度尺度的范围分析来处理灰度图像输入,窗宽采用80 HU,中心电平采用40 HU。此外,我们提出了一个最优水平集初始化,其中零水平集是通过分析脑密度来确定的。这些对水平集方法的改进产生了有效的脑卒中CT图像分割。将该方法的结果与基于相干传播方法的水平集算法的结果进行了比较,并与使用专家建立的基础真值的分水岭和区域生长算法的结果进行了比较。实验结果表明,该方法具有良好的性能,是一种很有前途的辅助医学诊断工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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