Radiation Imaging Detection Region Positioning for Rotation Accuracy
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Solution Overview
Problem
In radiation imaging apparatuses using flat panel detectors, the detection accuracy of radiation irradiation can degrade when the position of the radiation detection region deviates from the target part of the subject, especially due to variations in rotation angles.
Innovation Solution
A radiation imaging apparatus equipped with a rotation detector that determines the rotation angle of the imaging region relative to the subject, allowing the controller to adjust the detection region's position away from the side of the imaging region by a predetermined distance, ensuring accurate detection regardless of rotation angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the radiation imaging apparatus is fixed to a platform to perform imaging in the standing position, then the imaging can be performed with the apparatus in four possible rotation states, but the distance from the side of the subject's head to the closest detection region varies between states, causing the detection region to deviate from the target part and degrading detection accuracy
Solution Approach 1:
The detection region is made dynamic by adjusting its position based on the rotation angle detected by the rotation detector. The controller dynamically relocates the detection region to maintain optimal positioning relative to the subject's head side across different rotation states, transforming a static detection configuration into an adaptive one that responds to rotational changes.
Solution Approach 2:
The rotation detector provides feedback on the rotation angle of the imaging region, and the controller uses this feedback information to adjust the detection region position. This closed-loop feedback mechanism ensures that the detection region remains accurately positioned relative to the target part regardless of the apparatus's rotation state.
2Device complexity
If the detection region is fixed at a specific position, then the structure is simple, but the detection accuracy degrades when the imaging region rotates with respect to the subject
Solution Approach 1:
The detection region transitions from a fixed static position to a dynamic position that automatically adjusts based on rotation angle. This dynamic repositioning capability allows the system to maintain high detection accuracy across different rotation states without requiring complex manual reconfiguration, achieving a balance between operational simplicity and measurement precision.
Solution Approach 2:
The position parameter of the detection region is changed dynamically based on the rotation angle parameter. By linking the detection region position to the rotation angle through the controller, the system automatically compensates for rotational changes, maintaining accurate detection while keeping the overall system configuration relatively simple.
Data Source
AI summary
A radiation imaging apparatus comprising an imaging region configured to acquire a radiation image, a controller configured to set a detection region as a region to be used to detect the radiation in the imaging region and a rotation detector is provided. The rotation detector detects a rotation angle of a reference portion of the imaging region with respect to a reference direction of the subject, and the controller decides, in accordance with a part to be imaged of the subject and the rotation angle, a side located in the same direction as the reference direction of the subject among sides defining an outer edge of the imaging region, sets the detection region at a position away from the side by a predetermined distance for imaging of the part, and controls imaging based on a dose entering the detection region.