arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2006.05030eess.IVcs.CVcs.LG
收藏

基于多阶段Attentive-GAN的高对比度MRI合成方法在胶质瘤分割中的应用

High Tissue Contrast MRI Synthesis Using Multi-Stage Attention-GAN for Glioma Segmentation

Shenzhen University(深圳大学);Islamic Azad University(伊斯兰阿扎德大学)

Mohammad Hamghalam, Baiying Lei, Tianfu Wang

摘要:

磁共振成像(MRI)基于强磁场提供内部器官的不同组织对比度图像。尽管MRI在频繁成像中具有非侵入性优势,但目标区域的低对比度MR图像使组织分割成为一个具有挑战性的问题。本文展示了图像到图像转换技术生成合成高组织对比度(HTC)图像的潜在好处。值得注意的是,我们采用了一种新的循环生成对抗网络(CycleGAN),它具有注意力机制,以增加底层组织内的对比度。注意力块以及对HTC图像的训练,引导我们的模型收敛于某些组织。为了提高HTC图像的分辨率,我们采用多阶段架构,专注于一个特定的组织作为前景,并在每个阶段过滤掉无关的背景。这种多级结构还通过减小源域和目标域之间的间隙来消除合成图像的常见伪影。我们展示了我们的方法在脑MR扫描中合成HTC图像的应用,包括神经胶质瘤。我们还采用HTC MR图像的端到端和两个阶段的分割结构,以确认这些图像的有效性。在BraTS 2018数据集上的三个竞争性分割基线上的实验表明,将合成HTC图像纳入多模态分割框架中,分别将整个肿瘤、肿瘤核心和增强肿瘤的平均Dice评分提高了0.8%、0.6%和0.5%,同时从分割程序中消除了一个真实的MRI序列。

英文摘要:

Magnetic resonance imaging (MRI) provides varying tissue contrast images of internal organs based on a strong magnetic field. Despite the non-invasive advantage of MRI in frequent imaging, the low contrast MR images in the target area make tissue segmentation a challenging problem. This paper demonstrates the potential benefits of image-to-image translation techniques to generate synthetic high tissue contrast (HTC) images. Notably, we adopt a new cycle generative adversarial network (CycleGAN) with an attention mechanism to increase the contrast within underlying tissues. The attention block, as well as training on HTC images, guides our model to converge on certain tissues. To increase the resolution of HTC images, we employ multi-stage architecture to focus on one particular tissue as a foreground and filter out the irrelevant background in each stage. This multi-stage structure also alleviates the common artifacts of the synthetic images by decreasing the gap between source and target domains. We show the application of our method for synthesizing HTC images on brain MR scans, including glioma tumor. We also employ HTC MR images in both the end-to-end and two-stage segmentation structure to confirm the effectiveness of these images. The experiments over three competitive segmentation baselines on BraTS 2018 dataset indicate that incorporating the synthetic HTC images in the multi-modal segmentation framework improves the average Dice scores 0.8%, 0.6%, and 0.5% on the whole tumor, tumor core, and enhancing tumor, respectively, while eliminating one real MRI sequence from the segmentation procedure.

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。

↑