Dynamic Flow Phantom for DCE-CT Perfusion Calibration
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Solution Overview
Problem
Current Dynamic Contrast Enhanced (DCE) CT technologies face challenges in calibration, quantification difficulties, and motion-induced artifacts, making it hard to validate perfusion models and accurately measure perfusion parameters in dynamic flow imaging, especially in cancer treatment and radiation therapy.
Innovation Solution
A dynamic flow imaging phantom with a two-compartment model is developed, allowing for controlled fluid communication and adjustable flow rates, enabling the creation of physiologically relevant time concentration curves and validation of perfusion models without motion artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DCE-CT imaging is performed in clinical settings to measure perfusion parameters, then tissue and vascular enhancement can be tracked over time, but motion-induced artifacts and calibration difficulties reduce measurement accuracy
Solution Approach 1:
The patent creates a physical phantom that copies and simulates the physiological perfusion process in a controlled environment. The phantom replicates tissue and vascular enhancement patterns without the motion artifacts present in clinical imaging, providing a motion-free reference for calibration and validation of DCE-CT systems
Solution Approach 2:
The phantom allows preliminary calibration and validation of DCE-CT systems before clinical use. By establishing known perfusion parameters and enhancement curves in advance, the system can be calibrated to compensate for potential motion artifacts and measurement errors in actual clinical scans
2Measurement precision
If conventional DCE-CT systems are used for perfusion imaging, then tissue enhancement can be measured, but calibration and quantification difficulties prevent accurate validation of perfusion models
Solution Approach 1:
The phantom contains embedded reference materials with known attenuation properties that serve as internal calibration standards. These self-contained references allow the system to perform self-calibration and quality control without requiring external calibration phantoms or complex manual calibration procedures
Solution Approach 2:
The phantom incorporates reference materials with specifically selected attenuation coefficients that span the range of expected tissue enhancements. By using reference materials with known and varied attenuation properties, the system can establish accurate quantification curves and validate perfusion models across different enhancement levels
3Quantity of substance
If dynamic flow imaging is performed to obtain time series images, then perfusion parameters can be derived, but additional radiation exposure increases risk to cancer patients
Solution Approach 1:
The phantom enables partial validation using a reduced number of time points or lower contrast doses compared to full clinical protocols. By validating the imaging system and perfusion models against known phantom parameters with fewer scans, the approach allows for optimized clinical protocols that achieve sufficient accuracy with reduced radiation 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 phantom provides reproducible and accurate time concentration curves, improving image resolution, reducing radiation dosage, and enabling effective validation and calibration of DCE-CT systems, thus enhancing the accuracy of perfusion parameter measurements in clinical settings.
Implementation Method 1
a pump for providing fluid to the phantom
Implementation Method 2
an injector for providing contrast to the fluid
Implementation Method 3
respective valves for controlling outflow from each of the first and the second outlets
Data Source
AI summary
A phantom for simulation of perfusion, for use in dynamic flow imaging. The phantom includes a first compartment having a first inlet and a first outlet, and a second compartment having a second outlet. The first and the second compartments have fluid communication with each other, to simulate perfusion between the first and the second compartments. The first and the second outlets are separately controllable to adjust outflow of fluid from each compartment and to adjust fluid pressure in each compartment, thereby controlling rates of communication of fluids between the first and the second compartments.