Radiation Imaging Offset Data Management for Frame Rate Switching
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Solution Overview
Problem
Radiation imaging apparatuses face challenges in quickly obtaining offset data for each operation mode, especially when changing between high and low frame rates, due to residual image lag in offset data, which requires updating offset data efficiently across different modes.
Innovation Solution
The apparatus includes a holding unit and a controlling unit that manage offset data by reading out image data from the sensor array in both high and low frame rate modes after irradiation, allowing for efficient holding and updating of offset data for each mode, thereby shortening the time required to obtain accurate offset data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If offset data is obtained by reading image data from the sensor array after irradiation, then offset correction can be performed, but image lag (residual image) remains in the offset data reducing accuracy
Solution Approach 1:
The patent extracts and removes the image lag component from the offset data through image processing. The processing unit identifies and eliminates the residual image signal from the readout image data, leaving only the true offset component. This extraction process resolves the contradiction by retaining the useful offset information while removing the harmful image lag.
2Measurement precision
If offset data is updated frequently to adapt to environment changes, then offset correction accuracy improves, but the time required to obtain offset data for each operation mode increases
Solution Approach 1:
The patent merges the offset data acquisition process with the regular image readout operation. Instead of performing separate dedicated measurements to obtain offset data, the system utilizes the existing image readout infrastructure to simultaneously acquire both image data and offset data. This combining approach eliminates additional time overhead while maintaining accurate offset correction.
Solution Approach 2:
The system uses its own image readout mechanism to serve the dual purpose of capturing both image data and offset data. The regular image acquisition process automatically provides the offset information needed for correction, making the system self-sufficient and eliminating the need for separate offset measurement operations.
3Adaptability or versatility
If the radiation imaging apparatus has multiple operation modes with different frame rates, then operational versatility improves, but the complexity of managing offset data for each mode increases
Solution Approach 1:
The patent implements a universal offset data management approach where the same image readout and processing mechanism serves all operation modes. The processing unit automatically adapts to different frame rates and modes without requiring mode-specific offset acquisition procedures. This universal system handles multiple operation modes simultaneously, reducing management complexity while maintaining versatility.
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 time needed to obtain offset data for each operation mode, ensuring accurate offset correction and minimizing image lag, even when switching between different frame rates, thus enhancing the operational efficiency of the radiation imaging apparatus.
Implementation Method 1
a sensor array configured to detect radiation
Data Source
AI summary
A radiation imaging apparatus, comprising a sensor array, a readout unit, for reading out image data from the sensor array, which includes a first mode of reading out image data in a first period and a second mode of reading out image data in a second period shorter than the first period, a holding unit and a controlling unit, wherein, after irradiation to the sensor array is complete, the controlling unit performs first control which causes the holding unit to hold image data read out in the second mode while the sensor array is not irradiated, as offset data for the second mode, and then, performs second control which causes the holding unit to hold image data read out in the first mode while the sensor array is not irradiated, as offset data for the first mode.