CT Gantry Rotation Control for Variable Radiation Dose
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Solution Overview
Problem
Existing CT scanning apparatuses face challenges in achieving an optimal image signal-to-noise ratio due to varying X-ray emitting capacities and object sizes, often resulting in inadequate scanning or excessive radiation doses.
Innovation Solution
A gantry rotation control device that determines radiation doses and adjusts rotation velocity dynamically, using a radiation dose determination unit, minimum and maximum velocity determination units, and a rotation velocity control unit to optimize gantry rotation during scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the gantry rotates at a uniform speed, then the scanning process is simple and stable, but the image signal-to-noise ratio cannot be optimized for different object sizes and X-ray generator capacities
Solution Approach 1:
The gantry rotation control device transitions from uniform speed rotation to variable speed rotation, dynamically adjusting the rotation velocity based on real-time radiation dose requirements. The control unit receives radiation dose information from the X-ray generator and continuously modifies the gantry rotation speed to optimize the image signal-to-noise ratio while adapting to different object sizes and generator capacities.
Solution Approach 2:
The system changes the rotation velocity parameter of the gantry based on radiation dose levels. When radiation dose is high, the rotation speed is reduced to increase exposure time and improve signal quality; when radiation dose is low, rotation speed is increased to maintain scanning efficiency. This dynamic parameter adjustment resolves the contradiction between image quality and system complexity.
2Productivity
If the X-ray generator has high emitting capacity, then scanning speed can be increased, but excessive radiation doses are radiated to small-sized sites
Solution Approach 1:
The system applies different rotation velocities to different spatial locations during scanning. For small-sized sites, the gantry rotates more slowly to reduce radiation exposure, while for larger sites, faster rotation is permitted. This localized adjustment of rotation speed based on object geometry and radiation dose requirements eliminates excessive radiation to small areas while maintaining overall scanning productivity.
Solution Approach 2:
The gantry rotation control device implements a feedback mechanism where radiation dose information from the X-ray generator is continuously monitored and used to adjust rotation velocity in real-time. This closed-loop control ensures that when high radiation doses are detected, the rotation speed is automatically reduced to prevent excessive exposure, thereby protecting small-sized sites while maintaining scanning efficiency.
3Object-affected harmful factors
If the X-ray generator has low emitting capacity, then radiation dose is reduced, but the image signal-to-noise ratio becomes insufficient
Solution Approach 1:
The system dynamically adjusts the gantry rotation velocity to compensate for low X-ray generator capacity. When the radiation dose from a low-capacity generator is detected, the rotation speed is automatically reduced, increasing the exposure time and allowing more X-rays to reach the detector. This dynamic speed adjustment maintains adequate image signal-to-noise ratio even with limited radiation output.
Solution Approach 2:
The rotation velocity parameter is changed in response to radiation dose levels from low-capacity generators. By reducing rotation speed when generator capacity is limited, the system increases effective exposure time and improves signal quality without requiring higher radiation doses, thus maintaining image quality while using lower-capacity, safer generators.
4Productivity
If the gantry rotates faster, then scanning efficiency is improved, but radiation doses become excessive for small sites
Solution Approach 1:
The system changes the rotation velocity parameter dynamically based on real-time radiation dose measurements. When small-sized sites are detected or high radiation doses are measured, the rotation speed is reduced to limit cumulative radiation exposure. This parameter adjustment maintains scanning efficiency for large areas while protecting small sites from excessive radiation through localized speed reduction.
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 precise control of gantry rotation velocity, ensuring an optimal image signal-to-noise ratio is achieved while minimizing radiation exposure, thereby improving scanning efficiency and reducing unnecessary radiation doses.
Implementation Method 1
an x-ray generator capable of emitting X-rays to a target object for scanning
Implementation Method 2
The imaging device converts the received X-rays into electric signals
Data Source
AI summary
A gantry rotation control device for a computed tomography scanning apparatus. The gantry rotation control device includes a radiation dose determination unit for determining radiation doses of the X-rays that will be emitted to each site of the target object to be scanned, a minimum velocity determination unit for determining a minimum rotation velocity of the gantry according to a maximum radiation dose in the determined radiation doses, a maximum velocity determination unit for determining a maximum rotation velocity of the gantry according to the determined minimum rotation velocity, a rotation velocity determination unit for determining a rotation velocity of the gantry at any time during scanning of the target object according to the determined minimum rotation velocity and maximum rotation velocity, and a gantry rotation control unit for controlling the gantry to scan the target object while rotating according to the determined rotation velocity when the target object is to be scanned.