Radiographic Detector Rotation Beam Limiting Alignment
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Solution Overview
Problem
Radiographic imaging systems with rectangular detectors face challenges in preventing X-ray leakage during rotation due to misalignment of beam limiting forms, leading to potential X-ray exposure outside the detector's external shape.
Innovation Solution
A radiographic imaging apparatus with a radiation detector that can rotate and a changing unit to adjust the irradiation form based on rotation angle and speed, ensuring the beam limiting form remains within the effective imaging region, preventing X-ray leakage by synchronously rotating and adjusting the X-ray limiting device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the radiation detector is rotated during imaging, then the imaging coverage and flexibility are improved, but the beam limiting form becomes misaligned causing X-ray leakage
Solution Approach 1:
The beam limiting form is changed from a static rectangular shape to a dynamic variable shape that adapts to the rotation angle of the detector. The changing unit modifies the beam limiting form in real-time during detector rotation to maintain proper alignment and prevent X-ray leakage while preserving imaging flexibility.
Solution Approach 2:
The beam limiting form parameters (shape, size, orientation) are dynamically changed based on the detector's rotation angle and movement speed. This parameter adaptation ensures the beam limiting form remains properly aligned with the detector's effective imaging region throughout the rotation, eliminating X-ray leakage.
2Ease of manufacture
If a rectangular beam limiting form is used for a rectangular detector, then the manufacturing simplicity is improved, but the alignment precision deteriorates during rotation
Solution Approach 1:
The beam limiting form transitions from a fixed rectangular shape to a dynamically adjustable variable shape. The changing unit modifies the beam limiting form's parameters in real-time according to the detector's rotation state, maintaining precise alignment without compromising manufacturing simplicity.
Solution Approach 2:
The system incorporates feedback from the detector's rotation angle and movement speed to automatically adjust the beam limiting form. This closed-loop control ensures the beam limiting form remains precisely aligned with the detector's effective imaging region during rotation, eliminating manual alignment errors.
3Manufacturing precision
If the X-ray limiting device rotates synchronously with the detector, then the alignment accuracy is improved, but the device complexity increases
Solution Approach 1:
The beam limiting function is merged with the detector rotation mechanism. The changing unit integrates the beam limiting form adjustment with the detector's rotation movement, so that a single rotational action simultaneously achieves both detector positioning and beam alignment, reducing overall system complexity.
Solution Approach 2:
The detector rotation mechanism serves multiple functions: it positions the detector for different imaging angles and simultaneously adjusts the beam limiting form alignment. This multi-functionality eliminates the need for separate alignment mechanisms, reducing device complexity while maintaining precision.
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
Effectively prevents X-ray leakage to the rear side during detector rotation by maintaining the beam limiting form within the imaging region, ensuring accurate alignment and efficient operation without compromising the imaging area.
Implementation Method 1
a radiation detector (32) configured to convert radiation into an image signal
Implementation Method 2
The FPD 12 converts the radiation into visible light through a scintillator
Data Source
AI summary
A system is in a standby mode as an imaging preparation condition in step S1. If gripping of an operation handle is detected in step S2, the operation goes to step S3, in which an electromagnetic brake is released, thereby allowing a radiation detector to be rotated substantially around the center of an imaging region. If a rotation angle is detected in step S5, a first limiting device covering an effective imaging region of the radiation detector is changed to a second limiting device so as to be constantly arranged within the effective imaging region even during rotation of the radiation detector.