Radiation Image Console Brightness Offset Correction
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Solution Overview
Problem
In radiation image capturing systems, detecting the start of radiation irradiation by the image capturing apparatus itself leads to brightness differences in preview images, making it difficult for operators to confirm and determine the need for re-capturing, especially when the interface with the radiation generation device is not constructed, resulting in delayed image correction and display of corrected images.
Innovation Solution
A radiation image capturing system with a console that includes a radiation image capturing apparatus with scanning lines and signal lines intersecting each other, a scan drive unit to switch voltages, switch units to discharge electric charges, a readout circuit to detect radiation irradiation, and a control unit to set the timing for readout and generate preview image data, along with a console that holds the relationship between scanning lines and offset amounts to correct brightness differences in displayed preview images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the radiation image capturing apparatus detects the start of radiation irradiation by itself and starts readout from a specific scanning line, then the capturing timing can be flexibly controlled, but brightness differences occur in the preview image
Solution Approach 1:
The console performs preliminary calculation of offset amounts for each scanning line based on the relationship between scanning line numbers and offset amounts. This offset information is stored in advance and applied during preview image generation to compensate for brightness differences caused by varying readout start timings.
Solution Approach 2:
The system changes the parameter of offset amount according to the scanning line number. By calculating and applying different offset amounts to different scanning lines based on their position relative to the readout start line, the brightness uniformity is maintained despite flexible timing control.
2Adaptability or versatility
If the interface between radiation image capturing apparatus and radiation generation device is not constructed, then device compatibility is improved, but the apparatus cannot detect radiation irradiation timing from external signals
Solution Approach 1:
The radiation image capturing apparatus performs self-detection of radiation irradiation timing by monitoring its own operational state. The control unit determines the irradiation start timing based on when the apparatus begins capturing, without requiring external synchronization signals from the radiation generation device.
Solution Approach 2:
The system uses the scanning line readout process as an intermediary mechanism to synchronize image capture with radiation irradiation. By controlling which scanning line starts readout and applying appropriate offset amounts, the system achieves timing coordination without direct interface communication.
3Manufacturing precision
If offset correction is performed for each scanning line, then image quality is improved, but processing time is increased
Solution Approach 1:
The console calculates and stores offset amounts for each scanning line in advance, before actual image capture. This pre-computed offset information is then quickly applied during preview image generation, avoiding time-consuming real-time calculations while maintaining image quality.
Solution Approach 2:
The system uses a standardized relationship between scanning line numbers and offset amounts, allowing rapid parameter application without complex per-image processing. The offset amount is determined by the scanning line position rather than requiring individual calibration for each image.
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 appropriate and simple image correction for brightness differences in preview images, allowing for early display of corrected images, facilitating timely operator confirmation and determination of re-capturing needs.
Implementation Method 1
a so-called indirect-type radiation image capturing apparatus that converts the irradiated radiation into electromagnetic waves with another wavelength, such as visible light, by a scintillator and the like, thereafter, generates electric charges by photoelectric conversion elements such as photodiodes according to energy of the electromagnetic waves thus converted and irradiated
Implementation Method 2
a so-called indirect-type radiation image capturing apparatus that converts the irradiated radiation into electromagnetic waves with another wavelength, such as visible light, by a scintillator
Data Source
AI summary
A radiation image capturing system and a console are described. The radiation image capturing system includes a radiation image capturing apparatus and a console. The console holds in advance a relationship between a number of the scanning line from which readout of the image data is started and an offset amount superimposed on the image data to be read out. When the preview image is displayed, the console modifies the relationship so that the starting point is moved to a position of the scanning line from which the radiation image capturing apparatus actually starts the readout, calculates the offset amount for each of the scanning lines, and displays the preview image based on a value obtained by subtracting the offset amount from the corresponding preview image data.