Low-Dose X-Ray Image Preview via Correlated Noise Injection
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Solution Overview
Problem
Current methods for simulating low-dose cone-beam computed tomography (CBCT) images fail to accurately account for correlated noise, particularly in flat-panel detectors, limiting the ability to select optimal radiation doses for patients during image-guided interventions.
Innovation Solution
A method that injects correlated noise into x-ray image projections to simulate realistic low-dose CBCT images, allowing for patient-specific and task-specific protocol selection by processing these noise-injected projections to generate previews of low-dose x-ray images, which can be displayed to users for selecting appropriate radiation doses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If radiation dose is reduced to minimize patient exposure, then radiation safety is improved, but image quality deteriorates due to increased noise
Solution Approach 1:
The system performs preliminary noise simulation on high-quality reference images to predict low-dose image quality before actual scanning. By injecting correlated noise patterns into reference images acquired at higher doses, the system allows users to preview and compare expected low-dose image quality across different dose levels, enabling selection of the minimum adequate dose before patient exposure occurs.
Solution Approach 2:
The system creates synthetic copies of low-dose images by injecting correlated noise into high-quality reference images. These noise-injected copies accurately simulate the statistical properties and noise correlations of actual low-dose CBCT images, allowing users to evaluate image quality without exposing patients to low-dose scans. The copied images preserve anatomical detail while incorporating realistic noise patterns.
2Device complexity
If conventional noise simulation methods are used, then computational simplicity is improved, but accuracy deteriorates because correlated noise in flat-panel detectors is not accounted for
Solution Approach 1:
The system changes the parameters of noise simulation by incorporating correlated noise models specific to flat-panel detectors. Instead of using simple uncorrelated random noise, the system applies noise patterns that preserve the spatial correlations inherent in scintillator-based detectors. This involves modeling the point spread function and noise power spectrum of the detector to generate realistic correlated noise that accurately reflects actual low-dose image degradation.
Data Source
AI summary
A method of generating a preview of at least one low-dose x-ray image includes the followings steps: obtaining an initial volumetric representation of a patient from an x-ray device; creating at least one x-ray image projection from the initial volumetric representation; injecting correlated noise into at least one of the x-ray image projections; and processing the noise-injected x-ray image projections to create at least one preview of a patient-specific low-dose x-ray for showing to a user. There are also described a device for generating at least one preview of a low-dose x-ray image, a corresponding imaging system, and a non-transitory computer readable medium.