PPFM:使用单步后向采样泊松流生成模型对光子计数 CT 中的图像去噪

IF 4.6 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
Dennis Hein;Staffan Holmin;Timothy Szczykutowicz;Jonathan S. Maltz;Mats Danielsson;Ge Wang;Mats Persson
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引用次数: 0

摘要

在包括低剂量 CT(LDCT)图像去噪在内的各种生成任务中,扩散和泊松流模型都表现出令人印象深刻的性能。然而,一般来说,特别是在临床应用中,它们的一个局限性是采样速度较慢。由于其迭代性质,无论是有条件生成还是无条件生成,所需的函数评估(NFE)次数通常在 10-10^{3}$ 之间。在本文中,我们介绍了后验采样泊松流生成模型(PPFMs),这是一种用于低剂量和光子计数 CT 的新型图像去噪技术,能在保持 NFE = 1 的情况下生成出色的图像质量。通过更新泊松流生成模型(PFGMs)++ 的训练和采样过程,我们学习了一个条件生成器,它定义了先验噪声分布和后验相关分布之间的轨迹。我们还对采样过程进行了劫持和正则化处理,以实现 NFE = 1。我们的研究结果阐明了 PFGM++ 框架与扩散模型相比的优势。此外,在临床 LDCT 图像和来自原型光子计数 CT 系统的临床图像上,PPFM 与当前最先进的扩散型模型(NFE = 1)、一致性模型以及流行的基于深度学习和非深度学习的图像去噪技术相比,表现出色。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
PPFM: Image Denoising in Photon-Counting CT Using Single-Step Posterior Sampling Poisson Flow Generative Models
Diffusion and Poisson flow models have shown impressive performance in a wide range of generative tasks, including low-dose CT (LDCT) image denoising. However, one limitation in general, and for clinical applications in particular, is slow sampling. Due to their iterative nature, the number of function evaluations (NFEs) required is usually on the order of $10-10^{3}$ , both for conditional and unconditional generation. In this article, we present posterior sampling Poisson flow generative models (PPFMs), a novel image denoising technique for low-dose and photon-counting CT that produces excellent image quality whilst keeping NFE = 1. Updating the training and sampling processes of Poisson flow generative models (PFGMs)++, we learn a conditional generator which defines a trajectory between the prior noise distribution and the posterior distribution of interest. We additionally hijack and regularize the sampling process to achieve NFE = 1. Our results shed light on the benefits of the PFGM++ framework compared to diffusion models. In addition, PPFM is shown to perform favorably compared to current state-of-the-art diffusion-style models with NFE = 1, consistency models, as well as popular deep learning and nondeep learning-based image denoising techniques, on clinical LDCT images and clinical images from a prototype photon-counting CT system.
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来源期刊
IEEE Transactions on Radiation and Plasma Medical Sciences
IEEE Transactions on Radiation and Plasma Medical Sciences RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-
CiteScore
8.00
自引率
18.20%
发文量
109
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