X-ray Diaphragm Blade Control for Exposure Field Centering
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Solution Overview
Problem
Traditional X-ray diagnostic apparatuses face challenges in accurately matching the center of the exposure field to the test object due to limited movement and inertia of the retention feature, leading to unnecessary radiation exposure and complex operation of diaphragm blade units.
Innovation Solution
The apparatus includes a tabletop, X-ray tube, and X-ray detector with individually drivable diaphragm blade units and a beam-limiting control unit that adjusts the exposure field's center by relative movement of the tabletop, X-ray tube, and detector, using a beam-limiting drive unit and a judgment unit to ensure the exposure field remains within the detection range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the retention feature is moved to match the center of the detection range to the test object, then the positioning accuracy is improved, but the operation becomes difficult due to limited movement stroke and large inertia
Solution Approach 1:
The patent divides the positioning function into two independent parts: the retention feature maintains a fixed detection range, while the diaphragm blade units are individually controlled to adjust the exposure field center. This segmentation allows the exposure field to be repositioned without moving the entire retention feature, solving the limitation of fixed detection range positioning.
Solution Approach 2:
The patent introduces individual drive units for each diaphragm blade unit, enabling dynamic adjustment of the exposure field center position. The drive units allow independent movement of each blade, providing flexible and easy operation to match the exposure field center to any position within the fixed detection range, thereby improving ease of operation while maintaining positioning accuracy.
2Area of stationary object
If the detection range is expanded to cover the test object, then the coverage is improved, but unnecessary radiation exposure increases
Solution Approach 1:
The patent applies local quality by allowing different parts of the detection range to have different exposure states. The diaphragm blade units selectively block X-rays in specific regions, creating a localized exposure field that covers only the necessary test object area while leaving other regions unexposed. This resolves the contradiction by providing adequate coverage of the test object without unnecessary radiation to surrounding areas.
3Measurement precision
If the diaphragm blade units are operated individually to adjust the exposure field, then the positioning precision is improved, but the device complexity increases
Solution Approach 1:
The patent implements self-service through the individual drive units that automatically control each diaphragm blade unit's position. The system can autonomously adjust the exposure field center by coordinating the movement of individual blades without requiring complex manual operation or additional control mechanisms, thereby achieving precise positioning while managing device complexity.
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 solution allows for easy matching of the exposure field's center to the test object, reducing unnecessary exposure and simplifying the operation of diaphragm blade units, thereby improving image quality and operational efficiency.
Implementation Method 1
The X-ray tube irradiates X-rays, and the X-ray detector detects X-rays that permeate the subject
Implementation Method 2
The diaphragm blade unit narrows the detection range of the X-ray detector, cuts unnecessary X-rays, prevents unnecessary radiation exposure
Data Source
AI summary
When distance compute unit 81 received the instruction of the moving destination at the center of the exposure field 4a from center transfer operation unit 74, calculates the moving amount. Operating information processing unit 8 sends beam-limiting control unit 62 the calculated moving amount. Upside beam-limiting control unit 63 to right side beam-limiting control unit of beam-limiting control unit 62 makes the moving amount at the center of the exposure field 4a prescribed-times ((H1/H2) times in FIG. 3), calculates the moving amount of each diaphragm blade unit 51 in the upper part, the lower side, and the left part and the right part respectively.