Movable X-ray Diaphragm for Accurate Irradiation Range Setting
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Solution Overview
Problem
Conventional X-ray diaphragms in radiation therapy systems face challenges in accurately setting the X-ray irradiation range, especially for moving targets, due to the need for independent controller operation and varying imaging conditions among patients, making it difficult to minimize irradiation without irradiation.
Innovation Solution
A radiation therapy system with an X-ray imaging device featuring a movable X-ray diaphragm unit equipped with an X-ray shielding unit, driver, and position detector, connected to a control device that displays transmission images and simulation images to facilitate precise adjustment of the X-ray irradiation range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If X-ray irradiation is performed to set the irradiation range, then the irradiation range can be visualized, but unnecessary X-ray exposure and patient dose increase
Solution Approach 1:
The patent uses simulation images that copy the appearance of actual X-ray transmission images to display the irradiation range on the monitor. This allows operators to set the irradiation range by referencing the simulation image without performing actual X-ray irradiation, thereby eliminating unnecessary patient exposure while maintaining accurate range setting capability
Solution Approach 2:
The system performs preliminary actions by displaying simulation images and allowing irradiation range setting before actual X-ray imaging. The simulation image is generated in advance based on patient data, enabling operators to pre-determine the appropriate irradiation range without exposing the patient to diagnostic X-rays first
2Measurement precision
If independent controller operation is used for diaphragm positioning, then blade position can be detected by potentiometer, but operation complexity increases and accuracy deteriorates
Solution Approach 1:
The patent merges the diaphragm control function with the existing monitor and treatment planning system. The simulation image display and irradiation range setting are integrated into the same interface used for treatment planning, eliminating the need for separate controller operation and reducing overall system complexity while maintaining precise blade position control through the potentiometer
3Measurement precision
If X-ray irradiation is performed for every imaging to set irradiation range, then accurate range can be determined, but imaging time increases and productivity decreases
Solution Approach 1:
The system uses simulation images as copies of actual transmission images to determine the irradiation range. This allows operators to set accurate ranges by referencing the simulation image without performing time-consuming actual X-ray imaging, thereby maintaining range setting accuracy while significantly improving imaging efficiency
Solution Approach 2:
The simulation image is generated in advance before actual imaging, allowing the irradiation range to be predetermined. This preliminary determination eliminates the need for iterative X-ray imaging and range adjustment during the actual imaging process, thereby improving productivity while maintaining accuracy
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
Enables easy and accurate setting of the X-ray irradiation range, reducing unnecessary exposure and improving imaging quality by allowing operators to control the X-ray irradiation range without irradiation, thus minimizing patient dose and enhancing treatment efficiency.
Implementation Method 1
an X-ray generation unit, an X-ray detection unit which detects an X-ray irradiated from the X-ray generation unit
Implementation Method 2
an X-ray shielding unit which is configured with a plurality of members
Data Source
AI summary
An object is to provide a radiation therapy system which can easily and accurately set an X-ray irradiation range. A movable X-ray diaphragm unit 6 has, in its configuration, an X-ray shielding unit configured with a plurality of members, a driver for the X-ray shielding unit, and a position detector for acquiring a position of the X-ray shielding unit. It has displays 8 and 9 which display a transmission image of a subject based on an output of an X-ray detection unit and a simulation image when the X-ray shielding unit is projected on the X-ray detection unit 2 based on an output of the position detector.