PVCP Phantom Tissue Simulation for Photoacoustic Calibration
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Solution Overview
Problem
Current phantoms for photoacoustic imaging lack standardized materials that accurately mimic both optical and acoustic properties of tissues, leading to inadequate device performance assessment and quality control in medical imaging technologies.
Innovation Solution
Development of novel poly(vinyl chloride) plastisol (PVCP) phantoms with a combination of PVC and binary plasticizers like benzyl butyl phthalate (BBP) and di(2-ethylhexyl) adipate (DEHA), which can be tuned to mimic specific tissue types by adding optical and acoustic absorbers or scatterers, providing stable and biologically relevant properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prior PVCP phantoms are used, then manufacturing simplicity is maintained, but acoustic properties do not overlap with tissue-relevant properties
Solution Approach 1:
The patent employs a composite material system consisting of PVCP base polymer combined with specific acoustic modifiers (microspheres, microcapsules, or liquid suspensions) and optical absorbers. This composite approach enables independent tuning of acoustic properties (speed of sound, acoustic attenuation) and optical properties to match tissue characteristics, resolving the contradiction between material simplicity and acoustic accuracy.
Solution Approach 2:
The patent systematically varies key parameters including PVC concentration (5-20% w/v), plasticizer type and concentration, acoustic modifier concentration, and optical absorber concentration. By changing these parameters, the phantom can achieve tissue-relevant acoustic properties (speed of sound: 1400-1600 m/s, acoustic attenuation: 0.5-2.0 dB/cm/MHz) while maintaining manufacturing feasibility.
2Adaptability or versatility
If single-function phantoms are used, then manufacturing is simpler, but both optical and acoustic properties cannot be simultaneously mimicked
Solution Approach 1:
The patent creates a universal phantom platform that simultaneously mimics both optical and acoustic tissue properties through a single integrated material system. The PVCP base formulation serves multiple functions: providing the phantom matrix, enabling optical absorption tuning via additives, and allowing acoustic property adjustment through incorporated modifiers, eliminating the need for separate single-function phantoms.
Solution Approach 2:
The patent merges optical and acoustic tuning capabilities into a single phantom material system. Optical absorbers (carbon black, India ink, or dye solutions) and acoustic modifiers are combined within the same PVCP matrix, allowing simultaneous optimization of both optical and acoustic properties to match specific tissue types in one unified phantom structure.
3Measurement precision
If tissue-specific phantoms are created, then measurement precision improves, but manufacturing complexity increases
Solution Approach 1:
The patent segments the phantom formulation into modular components: PVCP base polymer, plasticizer system, acoustic modifiers (microspheres, microcapsules, or liquid suspensions), and optical absorbers. This segmentation allows independent optimization of each component for specific tissue types while maintaining a standardized base formulation, reducing overall manufacturing complexity compared to custom formulations.
Solution Approach 2:
The patent applies local quality by tailoring specific component concentrations and types to match particular tissue characteristics. For example, fatty tissue phantoms use higher concentrations of acoustic modifiers to achieve lower speed of sound (1400-1450 m/s), while parenchymal tissue phantoms use different compositions for higher speed of sound (1500-1600 m/s). This localized optimization maintains measurement precision without requiring entirely different phantom systems.
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 PVCP phantoms offer stable, biologically relevant optical and acoustic characteristics, enabling accurate calibration and testing of photoacoustic and ultrasound detection systems, improving device performance assessment and quality control by simulating various tissue types effectively.
Implementation Method 1
The PVCP gel can include one or more additives comprising an optical absorber... to adjust the optical and/or acoustic properties of the PVCP gel to mimic the corresponding optical and/or acoustic properties of a particular tissue type
Implementation Method 2
The PVCP gel can include one or more additives comprising an acoustic absorber... to adjust the optical and/or acoustic properties of the PVCP gel to mimic the corresponding optical and/or acoustic properties of a particular tissue type
Implementation Method 3
Photoacoustic Imaging (PAI) is an imaging modality that combines pulsed laser irradiation with ultrasonic sensing to provide optical absorption information
Data Source
AI summary
Novel phantoms are provided herein that can accurately mimic the optical and/or acoustic properties of living tissue. The disclosed phantoms are constructed of one or more polyvinyl chloride plastisol (PVCP) gels comprising a PVC and a binary plasticizer. The phantoms can be used, for example, to calibrate or test an optical and/or acoustic detection system, such as a photoacoustic imaging system or an ultrasound imaging system.