Region-Specific Scattered Ray Correction in Radiographic Imaging
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Solution Overview
Problem
Existing image processing techniques for radiographic images struggle to accurately correct components caused by scattered radiation, particularly in methods like dual-energy X-ray absorptiometry, due to the lack of consideration for regional differences in scattered rays.
Innovation Solution
An image processing apparatus and method that utilizes two radiation detectors with different energy levels to acquire and correct radiographic images, employing correction data specific to each region, including information on scattered ray intensity and spread, to accurately account for scattered radiation components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single scattered ray correction method is applied to the entire radiographic image, then the processing is simple, but the correction accuracy is insufficient due to regional differences in scattered rays
Solution Approach 1:
The radiographic image is divided into multiple regions (e.g., first region and second region) with different scattered ray characteristics. Separate correction values are calculated and applied to each region, enabling accurate correction that accounts for regional differences in scattered ray intensity and distribution.
Solution Approach 2:
Different correction strategies are applied to different regions of the image based on their specific scattered ray characteristics. The first region receives correction based on its scattered ray amount, while the second region receives different correction based on its own scattered ray characteristics, optimizing correction accuracy for each local area.
2Measurement precision
If scattered ray correction is performed without considering regional differences, then the processing is fast, but the accuracy of bone density calculations is reduced
Solution Approach 1:
The image processing divides the radiographic image into multiple regions and calculates scattered ray correction values separately for each region. This segmentation enables accurate bone density measurement by accounting for regional variations in scattered rays, while the automated calculation process minimizes additional processing time.
Solution Approach 2:
Scattered ray correction values are calculated and applied before bone density calculation. This preliminary correction ensures that the subsequent bone density measurement is performed on already-corrected image data, improving accuracy without requiring reprocessing.
3Reliability
If uniform correction data is used for all regions, then the correction process is simple, but scattered ray components cannot be accurately corrected in regions with different scattered ray intensities
Solution Approach 1:
Correction data is organized by region, with each region having its own scattered ray correction value. This segmented data structure improves correction reliability by matching correction parameters to regional characteristics, while the automated generation of region-specific data minimizes the complexity burden.
Solution Approach 2:
Each region is assigned correction data tailored to its specific scattered ray characteristics. The first region receives correction data appropriate for its scattered ray amount, and the second region receives different correction data, ensuring reliable correction for each local area.
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 enables precise correction of scattered radiation components in radiographic images, improving the accuracy of bone density calculations and reducing radiation exposure by using region-specific correction data.
Implementation Method 1
a radiation detector in which a plurality of pixels, each of which includes a conversion element that generates a larger amount of charge as it is irradiated with a larger amount of radiation
Implementation Method 2
each of which includes a conversion element that generates a larger amount of charge as it is irradiated with a larger amount of radiation
Data Source
AI summary
An image processing apparatus includes: an acquisition unit that acquires a radiographic image generated by a radiation detector irradiated with radiation from a radiography apparatus including the radiation detector in which plural pixels, each of which includes a conversion element that generates a larger amount of charge as it is irradiated with a larger amount of radiation, are arranged; and a correction unit that corrects scattered ray components caused by scattered rays of the radiation included in the radiographic image, using correction data for correcting scattered rays which is associated with each of plural regions in the radiographic image.