Portable Radiographic Detector Offset Calibration
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Solution Overview
Problem
Portable radiographic image detectors with built-in batteries face significant electricity consumption and shortened charge cycles due to frequent dark reading and data transmission processes, especially when using wireless communication, which hampers their portability and efficiency.
Innovation Solution
A portable radiographic image detector with a sensor panel unit, storage unit, calculation unit, and communication unit that calculates and transmits offset correction values only once, reducing the number of data transmissions and minimizing battery consumption by storing and calculating dark read values locally before transmitting the averaged offset correction values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dark reading and data transmission are performed frequently to obtain accurate offset correction values, then measurement precision is improved, but electricity consumption increases and battery life decreases
Solution Approach 1:
The system performs dark reading multiple times in advance before actual radiographic imaging to calculate the offset correction value. By preparing the correction value beforehand and storing it in memory, the system avoids performing dark reading and data transmission during the actual imaging process, thereby reducing battery consumption while maintaining measurement precision.
2Measurement precision
If dark reading is performed multiple times to calculate accurate offset correction values, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The system performs dark reading multiple times and calculates the offset correction value in advance, storing it in memory. This preliminary calculation eliminates the need for repeated data transmission during actual imaging operations, significantly reducing time loss while maintaining the accuracy benefits of multiple dark readings.
Solution Approach 2:
The system creates a copy of the calculated offset correction value and stores it in memory for reuse. Instead of performing dark reading and transmitting data multiple times during actual imaging, the system uses the stored correction value copy, thereby reducing both time loss and battery consumption while maintaining measurement precision.
3Reliability
If offset correction values are transmitted frequently to external devices, then reliability is improved, but electricity consumption increases
Solution Approach 1:
The system creates a local copy of the offset correction value in its memory and uses this stored copy for correction operations. This eliminates the need for frequent wireless transmission of correction values to external devices, significantly reducing power consumption while maintaining the reliability of having accurate correction values available for imaging operations.
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 significantly reduces the time and electricity consumption associated with data transmission, prolonging battery life and enhancing the portability of the radiographic image detector by minimizing repeated data transmissions.
Implementation Method 1
a direct type in which radiation energy is directly converted to electric charge by using a photoconductive material such as a-Se (amorphous selenium) as a radiation detecting element
Implementation Method 2
an indirect type in which radiation energy is converted to light by scintillator or the like
Implementation Method 3
the light is converted to electric charge by photoelectric conversion elements such as photodiode or the like
Data Source
AI summary
Provided are a portable radiographic image detector capable of transmitting with a smaller number of transmissions the read results of dark reads performed a plurality of times when an offset calibration or the like is carried out, and a radiographic image generation system using the portable radiographic image detector. The portable radiographic image detector comprises: a sensor panel with a plurality of radiation detector elements; a storage means for storing dark read values outputted from the radiation detector elements; a calculation means for calculating the offset correction value for each of the radiation detector elements, based on a plurality of dark read values obtained from the outputs of the radiation detector elements at every dark read of a plurality of times of dark reads previously performed; a communication means for transmitting the offset correction value for each of the radiation detector elements to an external device; and a built-in battery.