Radiation Imaging Pixel Calibration via Image-Dose Comparison
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional radiation imaging apparatuses face challenges in calibrating dose grasping pixels due to their different usage history compared to image capturing pixels, requiring more frequent output value calibration and being difficult to calibrate using output signals, especially when a scattering radiation removing grid is used.
Innovation Solution
A radiation imaging apparatus that includes a radiation detection unit with both image obtaining pixels and dose obtaining pixels, a generating unit to create calibration data by comparing output values, and a calibration unit to adjust the dose obtaining pixel output values based on the comparison, allowing for precise automatic exposure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the frequency of calibration is increased for dose grasping pixels, then the measurement precision is improved, but the loss of time increases
Solution Approach 1:
The system performs preliminary calibration actions by capturing images with the dose grasping pixel functioning as an image capturing pixel. The calibration data is generated in advance by comparing output values during normal imaging operations, so that when calibration is needed, the data is already prepared and available, eliminating the need for separate calibration procedures.
Solution Approach 2:
The dose grasping pixel calibrates itself by serving dual purposes: it functions as both a dose measurement pixel and an image capturing pixel. During normal imaging operations, it simultaneously captures images for calibration purposes and measures dose, making the system self-calibrating without requiring external calibration equipment or procedures.
2Measurement precision
If a scattering radiation removing grid is used, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The dose grasping pixel is designed to perform multiple functions: it serves as both a dedicated dose measurement pixel and an image capturing pixel. This multi-functionality allows the system to use the same pixel for both dose measurement with grid and for generating calibration data, simplifying the overall system architecture while maintaining measurement precision.
Solution Approach 2:
The system implements feedback by continuously comparing the output value of the dose grasping pixel with the output values of surrounding image capturing pixels. This feedback mechanism automatically adjusts and validates the calibration data, ensuring accurate dose measurement with the grid while simplifying the calibration process through automated comparison and validation.
3Reliability
If the output value calibration is performed more frequently, then the reliability is improved, but the productivity decreases
Solution Approach 1:
The calibration process is made continuous by integrating it into normal imaging operations. The dose grasping pixel continuously captures images during regular imaging procedures, and calibration data is continuously generated and updated. This eliminates interruptions to imaging throughput while maintaining continuous calibration and validation of dose measurement reliability.
Solution Approach 2:
Calibration data is generated in advance during normal imaging operations before it is needed for dose measurement. The system preliminarily captures calibration images and processes calibration data during routine imaging, so that when dose measurement is performed, the calibration is already complete and validated, ensuring reliability without impacting productivity.
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
Enables simple calibration of dose grasping pixels according to the radiation imaging apparatus' usage state, improving detection precision and throughput by using the output values of image obtaining pixels to calibrate dose obtaining pixels, even when a scattering radiation removing grid is employed.
Implementation Method 1
a digital radiation imaging apparatus that performs imaging by an imaging unit which uses a photoelectric conversion element
Data Source
AI summary
A radiation imaging apparatus includes: a radiation detection unit including an image obtaining pixel for obtaining a radiation image and a dose obtaining pixel for obtaining a radiation dose; a generating unit configured to generate calibration data for calibrating an output value of the dose obtaining pixel by comparing an output value of the image obtaining pixel and the output value of the dose obtaining pixel; and a calibration unit configured to calibrate the output value of the dose obtaining pixel by using the calibration data.