Radiation Phase Contrast Imaging Device Compact Configuration
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Solution Overview
Problem
Conventional radiation phase contrast imaging devices are bulky due to the need for a radiation detector to be positioned at a Talbot distance from the phase grating, making them difficult to compactify.
Innovation Solution
The device configuration allows for a flexible positioning of the radiation detector relative to the phase grating by setting the distance between the radiation source and the detector to a value different from the Talbot distance, maintaining a constant magnification ratio that ensures sufficient image magnification and detection capability, thereby reducing the overall device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the radiation detector is positioned at the Talbot distance from the phase grating, then the self-image can be clearly detected, but the device size becomes large
Solution Approach 1:
The patent changes the detection parameter by detecting not only the intensity distribution but also the phase information of the radiation beam. This allows the use of asymmetric gratings with different periods in the vertical and horizontal directions, enabling self-image detection at distances different from the Talbot distance, thereby reducing the device size while maintaining detection capability
Solution Approach 2:
The patent introduces phase information detection as an additional dimension beyond intensity detection. By utilizing phase-sensitive detection methods, the system can extract self-image information at non-Talbot distances, effectively adding a new detection dimension that bypasses the size constraint
2Length of stationary object
If asymmetric gratings with different periods in vertical and horizontal directions are used, then compact device configuration is achieved, but image quality may be compromised
Solution Approach 1:
The patent compensates for the asymmetric grating structure by changing the detection parameters to include phase information. The phase-sensitive detection method accounts for the different grating periods in vertical and horizontal directions, ensuring that image quality is maintained despite the asymmetric configuration enabling compact device size
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 enables the creation of a compact radiation phase contrast imaging device capable of detecting self-images effectively, with the flexibility to reduce the detector's size and the entire device configuration, while maintaining image quality.
Implementation Method 1
Such a device is configured to image an internal structure of an object by using Talbot interference
Implementation Method 2
the phase of the radiation changes while passing through the object
Implementation Method 3
The radiation detector has a detection surface that detects radiation
Data Source
AI summary
[PROBLEM TO BE SOLVED] To provide a radiation phase contrast imaging device having a small device configuration[SOLVING MEANS] The present invention focused on the findings that the distance between the phase grating 5 and the FPD 4 does not need to be the Talbot distance. The distance between the phase grating 5 and the FPD 4 can be more freely set. However, a self-image cannot be detected unless the self-image is sufficiently magnified with respect to the phase grating 5. The degree on how much the self-image is magnified on the FPD 4 with respect to the original phase grating 5 is determined by a magnification ratio X2/X1. Therefore, in the present invention, the magnification ratio is set to be the same as the magnification ratio in a conventional configuration. With this, even if the distance X2 between the radiation source 3 and the FPD 4 is reduced, a situation in which the self-image cannot be detected by the FPD 4 due to the excessively small size thereof does not occur.