arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1807.02152cs.CV
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基于自动深度学习的乳腺动态增强磁共振图像归一化

Automatic deep learning-based normalization of breast dynamic contrast-enhanced magnetic resonance images

Duke University(杜克大学)

Jun Zhang, Ashirbani Saha, Brian J. Soher, Maciej A. Mazurowski

摘要:

目的:开发一种自动图像归一化算法,仅使用图像信息对不同MRI扫描仪采集的具有各种成像参数的乳腺动态对比度增强磁共振成像(DCE-MRI)图像进行强度校正。方法:对460例乳腺癌患者的DCE-MR图像进行分析。每例受试者有一个T1加权造影前图像和三个T1加权造影后图像可用。我们的标准化算法是在假设不同患者的相同类型的组织应该由相同的体素值表示的情况下操作的。我们使用四种组织/材料类型作为标准化的锚点:1)空气,2)脂肪组织,3)致密组织和4)心脏。该算法分为以下两个步骤:首先,应用最先进的基于深度学习的算法来准确有效地执行组织分割。然后,基于分割结果,在锚点之间应用对象特定的分段线性映射函数,以将不同患者中的相同类型的组织归一化到相同的强度范围。我们用300名受试者进行训练,其余的用于测试。结果如下:我们的算法的应用程序与不同的扫描参数的图像,导致在像素值和提取的放射组学特征的一致性大大提高。结论:提出的基于组织分割的图像归一化策略可以完全自动地执行强度校正,而不需要知道扫描仪参数。意义:我们已经彻底测试了我们的算法,并表明它成功地归一化了DCE-MR图像的强度。我们公开了我们的软件,供其他人应用于他们的分析。

英文摘要:

Objective: To develop an automatic image normalization algorithm for intensity correction of images from breast dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) acquired by different MRI scanners with various imaging parameters, using only image information. Methods: DCE-MR images of 460 subjects with breast cancer acquired by different scanners were used in this study. Each subject had one T1-weighted pre-contrast image and three T1-weighted post-contrast images available. Our normalization algorithm operated under the assumption that the same type of tissue in different patients should be represented by the same voxel value. We used four tissue/material types as the anchors for the normalization: 1) air, 2) fat tissue, 3) dense tissue, and 4) heart. The algorithm proceeded in the following two steps: First, a state-of-the-art deep learning-based algorithm was applied to perform tissue segmentation accurately and efficiently. Then, based on the segmentation results, a subject-specific piecewise linear mapping function was applied between the anchor points to normalize the same type of tissue in different patients into the same intensity ranges. We evaluated the algorithm with 300 subjects used for training and the rest used for testing. Results: The application of our algorithm to images with different scanning parameters resulted in highly improved consistency in pixel values and extracted radiomics features. Conclusion: The proposed image normalization strategy based on tissue segmentation can perform intensity correction fully automatically, without the knowledge of the scanner parameters. Significance: We have thoroughly tested our algorithm and showed that it successfully normalizes the intensity of DCE-MR images. We made our software publicly available for others to apply in their analyses.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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