X-ray CT Apparatus Dynamic Read Region Control
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Solution Overview
Problem
Existing X-ray CT photography systems face inefficiencies in transferring X-ray detection signals due to unnecessary signal reading from non-irradiated areas of the detector, leading to degraded signal transfer efficiency and increased exposure doses.
Innovation Solution
An X-ray CT photographic apparatus with an X-ray generator, an X-ray regulating unit, and a read region controller that adjusts the X-ray cone beam's irradiation range and detection signal read region to only the specified CT photographic area, reducing unnecessary exposure and improving signal transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the X-ray detection signal is read from the whole detection surface during X-ray CT photography, then the complete detection data is obtained, but the transfer efficiency of the X-ray detection signal is degraded due to reading useless signals from non-irradiated areas
Solution Approach 1:
The patent applies local quality by making different regions of the X-ray detector serve different functions: the irradiated region reads and transfers X-ray detection signals while non-irradiated regions remain inactive. This is achieved through the control unit that identifies the irradiated region based on collimator position and rotation angle, and configures the readout circuit to selectively read signals only from the irradiated region, thereby improving transfer efficiency without compromising detection completeness.
2Device complexity
If the read region of the X-ray detection signal is fixed during X-ray CT photography, then the system structure is simple, but useless X-ray detection signals are read when the irradiated portion changes in the detection surface, degrading transfer efficiency
Solution Approach 1:
The patent implements dynamics by making the read region adaptive and changeable according to the actual irradiation position. The control unit dynamically determines the irradiated region on the detector based on the collimator's position and the gantry's rotation angle, and adjusts the readout circuit accordingly. This dynamic adjustment ensures that only relevant detection signals are read and transferred, maintaining high transfer efficiency throughout the rotation cycle without requiring a completely restructured system.
3Object-affected harmful factors
If the X-ray irradiation range is regulated to a specific region, then the exposure dose to the subject is reduced, but the read region controller must dynamically adjust the read region to maintain signal transfer efficiency
Solution Approach 1:
The patent employs feedback by using the collimator position and gantry rotation angle as input parameters to determine the irradiated region on the detector. The control unit continuously monitors these parameters and adjusts the read region configuration in real-time based on the calculated irradiation area. This feedback mechanism ensures that the readout circuit always targets the correct region, maintaining optimal signal transfer efficiency while supporting reduced irradiation ranges for lower patient exposure.
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
The apparatus efficiently transfers X-ray detection signals by limiting irradiation to the set CT region, reducing exposure doses and enhancing signal quality through precise control of the X-ray cone beam's irradiation range and detection signal read region.
Implementation Method 1
an X-ray generator (10a) that generates an X-ray... an X-ray detector (21) that detects the X-ray cone beam BX transmitted through a subject M1 on a detection surface
Data Source
AI summary
An X-ray CT photographic apparatus including: a beam shaping mechanism that regulates an irradiation range of an X-ray generated from an X-ray generator and shapes the X-ray into an X-ray cone beam; and a main body controller that changes a read region, where an X-ray detection signal is read in the X-ray detector, according to the irradiation range of the X-ray cone beam. The main body controller changes the irradiation range of the X-ray cone beam to an x-axis direction during an X-ray CT photography such that only a set CT photographic region is irradiated with the X-ray cone beam according to the set CT photographic region input through a CT photographic region setting unit. The main body controller changes a read region in an X-ray detector with respect to the x-axis direction in a detection surface of the X-ray detector during the X-ray CT photography.