Integrated QA Phantom for Radiotherapy System Verification
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Solution Overview
Problem
Current radiotherapy quality assurance (QA) processes require multiple phantom setups for different localization and positioning systems, leading to inefficiencies, increased time, and lack of reproducibility, as well as independent vendor-provided QA methods that do not allow for deviation analysis between systems.
Innovation Solution
A single integrated phantom with a cubic housing, extendable legs, rotational stage, and laser alignment marks that can be used for multiple QA tests, including radiofrequency beacon tracking and optical surface monitoring systems, allowing for independent verification and dose measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple separate phantoms are used for different QA procedures, then each specific QA test can be performed with dedicated equipment, but the overall QA process becomes time-consuming and requires multiple setups
Solution Approach 1:
The patent combines multiple separate QA phantoms into a single integrated phantom that can perform radiographic QA, non-radiographic QA, and dosimetry measurements. This merging eliminates the need for multiple separate setups and reduces the overall QA time while maintaining the precision of each individual test through dedicated features within the integrated phantom.
Solution Approach 2:
The integrated phantom is designed with multi-functionality to support various QA procedures including radiographic imaging, optical surface monitoring, RF beacon tracking, and dosimetry. This universal design allows a single phantom to replace multiple specialized phantoms, reducing setup time while preserving measurement precision through specialized components for each function.
2Reliability
If multiple separate phantoms are used for different localization systems, then each system can be tested independently, but the deviation analysis between systems becomes unavailable
Solution Approach 1:
The integrated phantom provides a common reference frame that enables both independent verification of each localization system and simultaneous comparison between systems. By incorporating features for radiographic, optical, and RF systems within the same physical reference structure, the phantom allows deviation analysis between systems while maintaining independent QA capabilities.
3Ease of operation
If vendor-provided QA phantoms are used, then the QA procedure is simple to implement, but the QA is not independent from the vendor
Solution Approach 1:
The integrated phantom combines multiple QA functions in a single device that can operate independently of vendor-specific systems. By incorporating radiographic, optical, and RF features within one phantom that uses standard imaging equipment, it provides vendor-independent QA while maintaining ease of operation through a unified setup procedure.
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 integrated phantom streamlines QA procedures, reduces setup time, and increases reproducibility by enabling simultaneous verification of multiple systems with high accuracy, reducing isocenter deviation analysis and simplifying phantom storage, while allowing independent QA checks.
Implementation Method 1
a rotational stage disposed within the cubic housing, where the rotational stage includes at least one radiofrequency beacon, where the rotational stage includes a rotation actuator that is external to the cubic housing, where the rotational stage enables verification of a radiofrequency beacon tracking system
Implementation Method 2
the raised feature enables verification of a radiotherapy optical surface monitoring system
Implementation Method 3
where when in the extended state the at least one extendable leg is disposed downward from the edge of the cubic housing, where the cubic housing rests on the treatment couch surface in a tilted position when the at least one extendable leg is in the deployed state
Data Source
AI summary
An integrated quality assurance (QA phantom) for radiotherapy is provided that includes a cubic housing having a raised topology feature and laser alignment marks on an exterior surface of the cubic housing that is adjacent and perpendicular to the anterior surface, an extendable leg disposed on a edge of the housing, where the housing rests on a treatment couch surface when the leg is in the retracted state, and the housing rests on the treatment couch in a tilted position when the leg is in the deployed state, and a rotational stage disposed within the housing that includes at least one radiofrequency beacon, where the rotational stage includes a rotation actuator that is external to the cubic housing, where the invention enables verification of radiotherapy an optical surface monitoring system, a rotational verification of the radiotherapy optical surface monitoring system, and verification of a radiofrequency beacon tracking system.