Microwave Breast Imaging Using Hypothesis Testing
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Solution Overview
Problem
Current breast cancer screening methods, such as X-ray mammography, suffer from high false positive and false negative rates, require breast compression, and expose patients to ionizing radiation, while existing microwave imaging techniques face challenges in resolving small tumors and handling breast heterogeneity.
Innovation Solution
A microwave-based imaging system using an antenna array and ultra-wideband pulses to detect and locate tumors by exploiting dielectric property contrasts, employing space-time beamforming and generalized likelihood ratio testing to minimize clutter and noise, and providing non-invasive, low-power, radiation-free imaging with improved resolution and reduced false positives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If X-ray mammography is used for breast cancer detection, then detection capability is provided, but false positive and false negative rates are high, and breast compression is required
Solution Approach 1:
The patent replaces the mechanical compression system of X-ray mammography with a microwave-based detection system that uses electromagnetic radiation to penetrate and image breast tissue without applying physical compression forces, thereby eliminating the source of patient discomfort while maintaining detection capability through dielectric property contrasts
2Reliability
If X-ray mammography is used for breast cancer detection, then detection capability is provided, but ionizing radiation exposure occurs
Solution Approach 1:
The patent changes the fundamental detection parameter from ionizing radiation (X-rays) to non-ionizing microwave radiation, utilizing the dielectric properties of tissue at microwave frequencies to achieve detection without harmful radiation exposure, thereby resolving the contradiction between detection capability and radiation safety
3Ease of operation
If microwave imaging is used to avoid radiation and compression, then patient comfort is improved, but resolution of small tumors is insufficient
Solution Approach 1:
The patent segments the breast tissue into distinct regions based on dielectric property contrasts, allowing differentiation between normal tissue, benign lesions, and malignant tumors. By analyzing local dielectric characteristics rather than relying solely on spatial resolution, the system achieves accurate detection of small tumors while maintaining patient comfort
Solution Approach 2:
The patent changes the detection parameter from spatial resolution alone to dielectric property contrast measurement, enabling the system to detect small tumors based on their unique electromagnetic characteristics rather than requiring high spatial resolution, thus maintaining comfort while improving detection precision
4Ease of operation
If microwave imaging is used for cancer detection, then non-invasive, low-power imaging is achieved, but handling of breast heterogeneity is difficult
Solution Approach 1:
The patent applies local quality analysis by measuring dielectric properties at specific locations within the breast tissue, allowing the system to characterize different tissue types (fatty, fibrous, glandular) and detect tumors based on their unique local electromagnetic characteristics, thereby overcoming the challenges of breast heterogeneity while maintaining imaging accessibility
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 reliable detection of small malignant tumors without breast compression, reduces unnecessary biopsies, and offers a cost-effective, widely accessible screening method with enhanced sensitivity and specificity, particularly effective in radiographically dense breast tissue and the upper outer breast quadrant.
Implementation Method 1
Microwave-based imaging exploits the contrast in dielectric properties between normal and malignant tissue
Implementation Method 2
With microwave tomography, the dielectric-properties profile of an object being imaged is recovered from measurement of the transmission of microwave energy through the object
Implementation Method 3
This may be accomplished with an antenna array and ultra-wideband microwave probe signals
Data Source
AI summary
Microwave examination of individuals is carried out by transmitting microwave signals from multiple antenna locations into an individual and receiving the backscattered microwave signals at multiple antenna locations to provide received signals from the antennas. The received signals are processed to remove the skin interface reflection component of the signal and the corrected signal data are provided to a hypothesis testing process. In hypothesis testing for detecting tumors, image data are formed from the test statistic used to perform a binary hypothesis test at each voxel. The null hypothesis asserts that no tumor is present at a candidate voxel location. The voxel threshold is determined by specifying a false discovery rate to control the expected proportion of false positives in the image. When the test statistic value associated with a voxel is greater than the threshold, the null hypothesis is rejected and the test statistic is assigned to the voxel. For voxels where the test statistic falls below the threshold, the null hypothesis is accepted and the voxel value is set to zero. The resulting image indicates the locations or other characteristics of detected tumors.