arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2104.01449eess.IVcs.CV
收藏

基于生成对抗网络的MR对比度感知图像到图像转换

MR-Contrast-Aware Image-to-Image Translations with Generative Adversarial Networks

Friedrich-Alexander Universität Erlangen-Nürnberg(弗里德里希-亚历山大大学埃尔兰根-纽伦堡分校);Technical University of Applied Sciences Amberg-Weiden(安贝格-魏登应用技术大学);Siemens Healthineers(西门子医疗)

Jonas Denck, Jens Guehring, Andreas Maier, Eva Rothgang

摘要:

目的磁共振成像(MRI)检查通常包括几个序列,产生不同的图像对比度。每个序列通过影响图像对比度、信噪比、采集时间和/或分辨率的多个采集参数进行参数化。根据临床适应症,放射科医生需要不同的对比度来进行诊断。由于MR序列采集是耗时的,并且采集的图像可能由于运动而被破坏,因此需要一种用于合成具有可调节对比度属性的MR图像的方法。因此,我们训练了一个图像到图像生成对抗网络的条件下的MR采集参数的重复时间和回波时间。我们的方法是出于风格传输网络,而“风格”的图像是明确给出在我们的情况下,因为它是由我们的网络conditionedon. Results的MR采集参数,这使我们能够合成MR图像与可调图像对比度。我们在fastMRI数据集上评估了我们的方法,这是一组公开的MR膝关节图像,并表明我们的方法在将非脂肪饱和MR图像转换为脂肪饱和图像方面优于基准pix 2 pix方法。我们的方法产生的峰值信噪比和结构相似性为24.48和0.66,大大超过了pix 2 pix基准模型。结论我们的模型是第一个实现微调对比度合成的模型,可用于合成缺失的MR对比度或作为MRI中AI训练的数据增强技术。

英文摘要:

Purpose A Magnetic Resonance Imaging (MRI) exam typically consists of several sequences that yield different image contrasts. Each sequence is parameterized through multiple acquisition parameters that influence image contrast, signal-to-noise ratio, acquisition time, and/or resolution. Depending on the clinical indication, different contrasts are required by the radiologist to make a diagnosis. As MR sequence acquisition is time consuming and acquired images may be corrupted due to motion, a method to synthesize MR images with adjustable contrast properties is required. Methods Therefore, we trained an image-to-image generative adversarial network conditioned on the MR acquisition parameters repetition time and echo time. Our approach is motivated by style transfer networks, whereas the "style" for an image is explicitly given in our case, as it is determined by the MR acquisition parameters our network is conditioned on. Results This enables us to synthesize MR images with adjustable image contrast. We evaluated our approach on the fastMRI dataset, a large set of publicly available MR knee images, and show that our method outperforms a benchmark pix2pix approach in the translation of non-fat-saturated MR images to fat-saturated images. Our approach yields a peak signal-to-noise ratio and structural similarity of 24.48 and 0.66, surpassing the pix2pix benchmark model significantly. Conclusion Our model is the first that enables fine-tuned contrast synthesis, which can be used to synthesize missing MR contrasts or as a data augmentation technique for AI training in MRI.

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。

↑