DSA Image Processing Device Scattered Ray Removal
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Solution Overview
Problem
In radiation image processing, especially in DSA images, motion artifacts and scattered radiation from structures like bones can hinder the observation of tubular structures such as blood vessels, as these artifacts are not completely removed during image processing.
Innovation Solution
A radiation image processing device and method that acquires both pre- and post-contrast agent images, removes scattered ray components from these images using a processor, and generates a difference image to suppress unnecessary structures, thereby enhancing the visibility of tubular structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a DSA image is acquired by subtracting a mask image from a live image, then the contrast agent distribution and blood vessel state can be visualized, but motion artifacts and scattered radiation from bones remain in the difference image, hindering observation
Solution Approach 1:
The patent segments the image processing into separate stages: first acquiring and processing mask and live images independently with scattered radiation removal, then performing subtraction. This allows targeted removal of scattered radiation from bones in each image before difference calculation, preventing bone structures from appearing as artifacts in the final DSA image.
Solution Approach 2:
The patent applies preliminary action by removing scattered radiation components from both the mask image and live image before performing the subtraction operation. This preliminary processing of individual images prevents scattered radiation artifacts from contaminating the final difference image, improving the quality of tubular structure visualization.
2Measurement precision
If scattered radiation is not removed, then the imaging process remains simple and fast, but unnecessary structures like bones remain in the DSA image, reducing diagnostic accuracy
Solution Approach 1:
The patent introduces an intermediary scattered radiation removal process that acts as a mediator between the raw image acquisition and the final difference image generation. By inserting this intermediate processing step that removes scattered radiation components from both mask and live images, the system achieves cleaner DSA images with reduced bone artifacts while maintaining processing efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces the impact of scattered radiation and motion artifacts, allowing for clearer visualization of blood vessels and other tubular structures in DSA images, thereby aiding in more accurate diagnostic and treatment procedures.
Implementation Method 1
due to an influence of scattered rays generated in a case in which radiation is transmitted through a subject
Data Source
AI summary
A processor is configured to: acquire a first radiation image including a tubular structure before an injection of a contrast agent and a second radiation image including the tubular structure during the injection of the contrast agent or after the injection of the contrast agent; derive a processed first radiation image by removing a scattered ray component included in the first radiation image; derive a processed second radiation image by removing a scattered ray component included in the second radiation image based on the scattered ray component of the first radiation image; and derive a difference image between the processed first radiation image and the processed second radiation image.