Smartphone Tactile Imaging via Optical Waveguide Scattering
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Solution Overview
Problem
Existing tactile imaging systems for characterizing tumors are bulky, expensive, and require a hospital setting, making them non-portable and complex to operate, while elastography is influenced by tissue compression leading to potential misdiagnosis.
Innovation Solution
A mobile-platform imaging device using a flexible optical waveguide, force sensor, and smartphone communication for generating images based on light scattering during deformation, allowing for portable and cost-effective tumor characterization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a tactile imaging system is designed to be portable and cost-effective, then device complexity and cost are reduced, but measurement precision and reliability may deteriorate
Solution Approach 1:
The patent combines multiple functions into a single integrated mobile device: the optical waveguide for tactile sensing, the force sensor for compression measurement, and the smartphone for image processing and communication are merged into one portable unit. This integration reduces system complexity while maintaining measurement precision through coordinated operation of all components.
Solution Approach 2:
The optical waveguide acts as an intermediary between the tactile sensor and the smartphone camera. It converts mechanical deformation into optical signals that can be captured by the camera, enabling precise tumor characterization without requiring complex direct measurement mechanisms.
2Measurement precision
If elastography is used to detect tumors, then measurement precision is improved, but reliability deteriorates due to tissue compression influence
Solution Approach 1:
The force sensor provides real-time feedback on the compression force applied during imaging. This feedback is used to normalize the optical measurements, compensating for the influence of tissue compression and ensuring reliable tumor characterization across different compression conditions.
Solution Approach 2:
The system changes the parameter being measured from direct tissue elasticity (which is compression-dependent) to optical scattering patterns under controlled compression. By measuring how light scatters through the tissue at known compression levels, the system achieves reliable tumor detection independent of compression variability.
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
Enables accurate, portable, and cost-effective characterization of tumors by estimating mechanical properties like size, stiffness, and elasticity, facilitating prescreening and training in tumor detection.
Implementation Method 1
The waveguide is configured so that at least some of the light directed into the optical waveguide is scattered out of the first layer when the first layer is deformed
Data Source
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Figure 5A~5C
AI summary
A mobile-platform imaging device uses compression of the target region to generate an image of an object. A tactile sensor has an optical waveguide with a flexible, transparent first layer. Light is directed into the waveguide. Light is scattered out of the first layer when the first layer is deformed. The first layer is deformed by the tactile sensor being pressed against the object, A force sensor detects a force pressing the tactile sensor against the object and outputs corresponding force information. A first communication unit receives the force information from the force sensor. A receptacle holds a mobile device with a second communication unit and an imager that can generate image information using light scattered out of the first layer. The first communication unit communicates with the second communication unit and the mobile device communicates with an external network.