Photomagnetic Imaging Tissue Resolution Depth Trade-off
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Solution Overview
Problem
Current in vivo imaging techniques, such as diffuse optical tomography and photoacoustic imaging, face limitations in resolution and depth penetration due to tissue scattering and the need for external measurements, leading to reduced image quality and difficulty in detecting small lesions, especially in breast imaging.
Innovation Solution
Photomagnetic imaging (PMI) uses a continuous wave laser to heat tissue, measured by magnetic resonance thermometry, allowing for the determination of tissue absorption and scattering coefficients, enabling higher resolution imaging without tissue contact and overcoming acoustic noise issues, using MRI to image the entire volume and estimate concentrations of oxyhemoglobin, deoxyhemoglobin, fat, and water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If photoacoustic imaging uses short-pulsed laser to rapidly raise tissue temperature, then resolution is improved, but tissue depth penetration is reduced
Solution Approach 1:
The patent replaces the photoacoustic detection mechanism (ultrasound wave detection) with magnetic resonance thermometry. Instead of detecting ultrasound waves generated by thermal expansion, the system uses MRI to directly measure temperature changes in tissue caused by laser heating, eliminating the need for acoustic wave propagation and improving penetration depth while maintaining resolution.
Solution Approach 2:
The patent changes the detection parameter from acoustic pressure (in photoacoustic imaging) to temperature (in photomagnetic imaging). By measuring temperature changes directly via MRI rather than detecting acoustic waves, the system achieves both high resolution and deep tissue penetration without the trade-off present in photoacoustic methods.
2Measurement precision
If photoacoustic imaging uses high frequency ultrasonic transducers, then resolution is improved, but imaging depth is limited
Solution Approach 1:
The patent substitutes the ultrasonic transducer detection system with magnetic resonance imaging. Instead of using high-frequency ultrasound transducers that are limited in penetration depth, the system employs MRI to detect temperature changes, allowing deep tissue imaging while maintaining high spatial resolution through the intrinsic capabilities of MRI.
3Ease of manufacture
If optical imaging measures from boundary of medium, then data acquisition is simplified, but resolution and depth penetration are reduced
Solution Approach 1:
The patent combines the capabilities of optical imaging (laser heating) with magnetic resonance imaging (volume temperature measurement) to create a photomagnetic imaging system. This multi-functional approach allows the system to use optical lasers for selective heating while utilizing MRI's volume imaging capability to measure temperature changes throughout the entire tissue volume, achieving both deep penetration and high resolution without being limited to boundary measurements.
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
PMI provides improved localization and resolution compared to DOT and photoacoustic imaging, allowing deeper tissue imaging without acoustic noise artifacts, and can be used in breast cancer management and other internal body parts, including lymph nodes, prostate, and pancreas, with potential for catheter-based applications.
Implementation Method 1
heating the tissue using light... heating the tissue with laser light incident upon the tissue
Implementation Method 2
PMI works by using a continuous wave (CW) laser to heat tissue with laser light
Implementation Method 3
measuring the resulting temperature changes with an MRI machine operating in a magnetic resonance thermometry (MRT) mode
Data Source
AI summary
A method for photomagnetic imaging of tissue includes the steps of heating the tissue using light; measuring a change in temperature of the tissue with magnetic resonance thermometry; and creating an optical property map from the measured change in temperature. An apparatus for performing photomagnetic imaging of tissue which includes a light source to heat the tissue, a magnetic resonance imaging system to measure a change in temperature of the tissue, and a data processor to generate an optical property map from the measured change in temperature. An optical property map of tissue photomagnetic imaging of tissue produced by: heating the tissue using light; measuring a change in temperature of the tissue with magnetic resonance thermometry; and creating an optical property map from the measured change in temperature.