Radiation Imaging Brightness Feedback Under Delayed Field Changes
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Solution Overview
Problem
Existing radiation imaging systems face inaccuracies in automatic brightness control (ABC) due to delays in notification of irradiation field changes, leading to unintended fluctuations in radiation exposure and potential patient overexposure.
Innovation Solution
A radiation imaging apparatus with a control unit that calculates brightness information and adjusts irradiation conditions based on threshold fluctuations, delaying feedback until a predetermined time has elapsed to maintain consistent radiation levels despite delayed notifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the control unit immediately transmits irradiation condition information when brightness fluctuation exceeds the threshold, then the response speed to brightness changes is improved, but false feedback occurs due to delayed irradiation field change notifications causing unstable radiation exposure
Solution Approach 1:
The control unit performs preliminary verification by checking whether a collimator leaf change notification has been received before transmitting irradiation condition information. This preliminary action prevents false feedback by ensuring that brightness fluctuations are not mistakenly attributed to radiation generation apparatus issues when they are actually caused by delayed collimator notifications
Solution Approach 2:
The system implements a feedback mechanism where the control unit monitors both brightness information and collimator leaf change notifications. When brightness fluctuation exceeds the threshold, the control unit checks the notification status before generating feedback, thereby ensuring that only genuine brightness control adjustments are transmitted to the radiation generation apparatus
2Reliability
If the control unit waits for collimator notification before adjusting brightness control, then false feedback is prevented, but the response to actual brightness changes is delayed
Solution Approach 1:
The control unit dynamically adjusts its feedback behavior based on the reception status of collimator leaf change notifications. When a notification is received, the control unit withholds feedback transmission; when no notification is received, the control unit proceeds with feedback. This dynamic adaptation allows the system to respond quickly to genuine brightness changes while preventing false feedback from delayed notifications
3Object-affected harmful factors
If the collimator unit changes the irradiation field, then radiation exposure dose is reduced, but delayed notification causes unintended image brightness fluctuations
Solution Approach 1:
The control unit acts as an intermediary between the collimator unit and the radiation generation apparatus. It monitors collimator leaf change notifications and uses this information to modulate the feedback signal sent to the radiation generation apparatus, thereby compensating for the delayed notification and maintaining image brightness stability despite collimator-induced irradiation field changes
Data Source
AI summary
A radiation imaging apparatus includes a pixel unit including a plurality of pixels and configured to generate image data according to received irradiation of radiation from a radiation generation apparatus, and a control unit configured to acquire irradiation information regarding a radiation irradiation area or an irradiation position of the pixel unit, calculate brightness information of each of successive pieces of image data provided by the pixel unit based on the image data and the irradiation information, generate irradiation condition information of the radiation generation apparatus based on the brightness information, and transmit the irradiation condition information to the radiation generation apparatus. The control unit recalculates the brightness information when a fluctuation of the brightness information exceeds a threshold value. The control unit does not transmit irradiation condition information based on the recalculated brightness information to the radiation generation apparatus until a predetermined period of time elapses since the recalculation.