Cardiac Target Radiotherapy With Motion-Split Beam Control
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Solution Overview
Problem
Existing radiotherapy techniques struggle to accurately and efficiently control treatment beams for cardiac targets due to complex physiological motions, particularly cardiac and respiratory movements, leading to potential irradiation of unintended areas and prolonged treatment times.
Innovation Solution
A radiotherapy device with a controller that generates beam shaping and gating control signals based on detected cardiac and respiratory motions, using MR imaging and physiological motion components to dynamically adjust the treatment beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beam gating is used to account for cardiac motion, then irradiation accuracy to cardiac targets is improved, but treatment time increases significantly
Solution Approach 1:
The patent segments the physiological motion into two distinct components: respiratory motion and cardiac motion. This segmentation allows different control strategies to be applied to each component - beam shaping for respiratory motion and beam gating for cardiac motion - thereby optimizing both accuracy and treatment time by addressing each motion type with its most effective control method.
2Measurement precision
If beam shaping is used to account for respiratory motion, then irradiation accuracy is improved, but the system cannot respond quickly enough to cardiac motion
Solution Approach 1:
The patent segments the physiological motion into two distinct components: respiratory motion and cardiac motion. This segmentation allows different control strategies to be applied to each component - beam shaping for respiratory motion and beam gating for cardiac motion - thereby optimizing both accuracy and treatment time by addressing each motion type with its most effective control method.
Solution Approach 2:
The patent implements dynamic control by using real-time detection of physiological motions and adjusting beam parameters accordingly. The system dynamically switches between beam shaping and beam gating strategies based on the detected motion components, enabling rapid response to cardiac motion while maintaining accuracy for respiratory motion compensation.
3Measurement precision
If simultaneous gating for both respiratory and cardiac phases is applied, then irradiation precision to cardiac targets is improved, but treatment becomes impractically long
Solution Approach 1:
The patent segments the physiological motion into two distinct components: respiratory motion and cardiac motion. This segmentation allows different control strategies to be applied to each component - beam shaping for respiratory motion and beam gating for cardiac motion - thereby optimizing both accuracy and treatment time by addressing each motion type with its most effective control method.
Solution Approach 2:
The patent applies partial gating action by using beam shaping for respiratory motion compensation and only gating for cardiac motion when necessary. This partial application of gating, rather than simultaneous gating for both motion types, maintains irradiation precision while avoiding impractically long treatment times.
4Measurement precision
If collimator movement is used to adapt beam shape to tumour location, then irradiation accuracy is improved, but the system cannot respond quickly enough to cardiac motion
Solution Approach 1:
The patent implements dynamic control by using real-time detection of physiological motions and adjusting beam parameters accordingly. The system dynamically switches between beam shaping and beam gating strategies based on the detected motion components, enabling rapid response to cardiac motion while maintaining accuracy for respiratory motion compensation.
Data Source
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AI summary
A radiotherapy device is disclosed. The radiotherapy device includes a radiation source, a detecting means and controller communicatively coupled to the radiation source and the detecting means. The radiation source is configured to generate a treatment beam for irradiating a subject. The detecting means is configured to detect a motion of the subject, the motion comprising a first physiological motion component and a second physiological motion component. The controller is configured to generate a beam shaping control signal based on the first physiological motion component and to generate a beam gating control signal based on the second physiological motion component