IPv2: An Improved Image Purification Strategy for Real-World Ultra-Low-Dose Lung CT Denoising
This work addresses image quality issues in medical imaging for patients undergoing low-dose CT scans, but it is incremental as it builds on a prior purification strategy.
The paper tackles the problem of denoising real-world ultra-low-dose lung CT images by improving an existing image purification strategy to address limitations in background and lung parenchyma denoising, resulting in consistent improvements in background suppression and lung parenchyma restoration across multiple models on a dataset at 2% radiation dose.
The image purification strategy constructs an intermediate distribution with aligned anatomical structures, which effectively corrects the spatial misalignment between real-world ultra-low-dose CT and normal-dose CT images and significantly enhances the structural preservation ability of denoising models. However, this strategy exhibits two inherent limitations. First, it suppresses noise only in the chest wall and bone regions while leaving the image background untreated. Second, it lacks a dedicated mechanism for denoising the lung parenchyma. To address these issues, we systematically redesign the original image purification strategy and propose an improved version termed IPv2. The proposed strategy introduces three core modules, namely Remove Background, Add noise, and Remove noise. These modules endow the model with denoising capability in both background and lung tissue regions during training data construction and provide a more reasonable evaluation protocol through refined label construction at the testing stage. Extensive experiments on our previously established real-world patient lung CT dataset acquired at 2% radiation dose demonstrate that IPv2 consistently improves background suppression and lung parenchyma restoration across multiple mainstream denoising models. The code is publicly available at https://github.com/MonkeyDadLufy/Image-Purification-Strategy-v2.