Bias Line Segmentation for Radiation Detector Cross Talk
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Solution Overview
Problem
Radiation image photographing apparatuses experience cross talk in the scanning line direction, leading to inaccurate image data and potential misdiagnosis in medical imaging, due to uneven bias voltage distribution and resistance in the connection lines.
Innovation Solution
The apparatus is designed with bias lines connected in a ratio of one to each column of radiation detecting elements, and these lines are grouped and connected to connection lines to reduce resistance and prevent cross talk by ensuring the bias voltage returns to its original state promptly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bias lines are connected to all radiation detecting elements in the scanning line direction, then uniform bias voltage distribution is achieved, but resistance in connection lines causes cross talk and voltage fluctuation
Solution Approach 1:
The patent divides the detecting section into multiple regions along the scanning line direction, with each region having its own separate connection line for bias voltage supply. This segmentation isolates the voltage fluctuations caused by charge flow in one region from affecting other regions, thereby preventing cross talk while maintaining reliable image data acquisition across all detecting elements.
2Device complexity
If single connection line is used for bias voltage supply, then device complexity is reduced, but voltage fluctuation occurs during charge discharge
Solution Approach 1:
The patent segments the single connection line into multiple separate connection lines, each serving a specific region of detecting elements. This increases the number of connection lines but eliminates voltage fluctuation by preventing charge discharge in one region from affecting the bias voltage in other regions, thereby improving reliability.
3Productivity
If bias voltage is applied to all detecting elements simultaneously, then read-out efficiency is improved, but cross talk occurs in the scanning line direction
Solution Approach 1:
The patent segments the detecting section into multiple regions with separate connection lines, enabling simultaneous read-out of all detecting elements while preventing cross talk. Each region's bias voltage is independently controlled, allowing efficient parallel operation without interference between adjacent regions in the scanning line direction.
Data Source
AI summary
A radiation image photographing apparatus is provided with a bias source to apply a bias voltage via bias lines to radiation detecting elements arranged in a two dimensional form in regions divided by scanning lines and signal lines. The bias lines are connected to the radiation detecting elements with a ratio of one bias line to the radiation detecting elements arranged on one column in an extension direction of the signal line, and the bias lines are connected per a predetermined number of bias lines to either one of a plurality of connection lines. The bias voltage is applied from the bias source to the connection lines via the bias lines so that the bias voltage is applied to the radiation detecting elements via the bias lines connected to the connection lines.