Radiation Imaging System Exposure Index Calculation
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Solution Overview
Problem
Existing radiation imaging systems face challenges in accurately and simply calculating the dose of radiation for images comprising multiple frame images, making it difficult to determine whether the intended radiation dose has been reached.
Innovation Solution
A radiation imaging system equipped with a hardware processor that calculates an exposure index representative value based on multiple frame images, allowing for the setting of a target exposure index value specific to each imaging mode, and computes the radiation dose corresponding to the cumulative amount of all imaged frames using imaging conditions, distance information, and the number of pulses from the radiation generating apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If one exposure index is calculated for one radiation image comprising multiple frame images, then the calculation process becomes simple, but the measurement precision of the radiation dose is insufficient
Solution Approach 1:
The patent divides the radiation image into multiple frame images and calculates exposure index for each frame separately. This segmentation allows the system to maintain simplicity in the calculation process while improving measurement precision by evaluating each frame individually rather than treating the entire multi-frame image as a single unit.
2Ease of operation
If the target exposure index value is set uniformly for all imaging modes, then the system operation becomes simple, but the adaptability to different imaging conditions deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of the target exposure index value based on the detected imaging mode. The system automatically changes the target value according to whether the imaging mode is fluoroscopy, angiography, or other modes, thereby maintaining simple operation for the user while adapting to different imaging conditions through automated parameter adjustment.
3Measurement precision
If the exposure index is calculated based on cumulative amount of all frames, then the radiation dose management becomes accurate, but the calculation complexity increases
Solution Approach 1:
The patent merges the exposure index calculations of all individual frames by computing the average value. This combining approach achieves accurate cumulative dose management by considering all frames while maintaining relatively simple calculation processes through the use of average value computation rather than more complex integration methods.
4Stability of the object's composition
If automatic image processing is performed on generated radiation images, then the image quality is maintained constantly, but the ability to determine whether intended radiation dose reached the detector is lost
Solution Approach 1:
The patent introduces feedback by calculating and displaying the exposure index and its deviation from the target value after automatic image processing is performed. This feedback mechanism allows the system to maintain constant image quality through automatic processing while simultaneously providing users with dose information through the exposure index, enabling them to determine whether the intended radiation dose reached the detector.
Data Source
AI summary
A radiation imaging system includes a controller having a hardware processor which, under control of a stored program, performs processes including: obtaining a radiation image including a plurality of frame images; calculating an exposure index representative value of the radiation image, based on information obtained from the radiation image; and setting a target value of an exposure index differently for each of at least one imaging mode of the radiation imaging system. The target value of the exposure index represents a preferable value of the exposure index representative value.