研究目的
Developing and experimental testing of the Mueller-matrix diffuse tomography approach for the layer-by-layer reconstruction of fluctuations of optical anisotropy within thin tissue samples, with the final target to differentiate polycrystalline blood films of healthy donors and patients with prostate cancer.
研究成果
The 3D Mueller-matrix diffuse tomography method was successfully developed and tested, allowing for layer-by-layer reconstruction of fluctuations in optical anisotropy of blood films. Statistical moments of the third and fourth orders were identified as most sensitive for differentiating between healthy donors and prostate cancer patients, achieving good to excellent balanced accuracy (80-92%). This approach provides a non-invasive diagnostic tool with high potential for early cancer detection based on structural changes in blood proteins.
研究不足
The main limitations include the invasive procedure of preparing bio-tissue samples, partial depolarization of incident light reducing diagnostic accuracy, and complexity due to spatially inhomogeneous structure and presence of uniform elements in blood samples. The method is applied specifically to prostate cancer diagnosis and may have constraints in generalization to other cancers or conditions.
1:Experimental Design and Method Selection:
The study uses a 3D Mueller-matrix polarimetry technique based on differential matrix decomposition and digital holographic reconstruction. The theoretical framework involves Mueller matrix decomposition into polarized and depolarized parts using differential matrices.
2:Sample Selection and Data Sources:
Blood samples from 18 healthy donors and 18 patients with prostate cancer were used. Each sample film was prepared by applying a drop of blood to a glass substrate and drying at room temperature, with optical thickness between
3:68 and 75 and depolarization degree between 41% and 52%. List of Experimental Equipment and Materials:
He-Ne laser (λ=
4:6328 μm), collimator, beam splitter, optical mirrors, polarizers, quarter wave plates (Achromatic True Zero-Order Waveplate), polarizer (B + W Kaesemann XS-Pro Polarizer MRC Nano), strain-free microobjective (Nikon CFI Achromat P, focal length 30 mm, numerical aperture 1, magnification 4×), digital camera (The Imaging Source DMK 41AUAS, monochrome 1/2" CCD, Sony ICX205AL, resolution 1280×960, light-sensitive pad size 7600×6200 μm, sensitivity 05 lx, dynamic range 8 bit, SNR 9 bit), personal computer, glass substrates. Experimental Procedures and Operational Workflow:
The optical setup involves forming a laser beam, splitting it into irradiating and reference beams, passing through polarization filters to create specific polarization states (0°, 90°, 45°, right-circular), illuminating the sample, recording interference patterns with a digital camera through a polarizer-analyzer, applying Fourier transform and inverse Fourier transform to reconstruct complex amplitudes in different phase planes, calculating Stokes vectors and Mueller matrices, and determining diffuse tomograms using logarithmic matrix algorithms.
5:Data Analysis Methods:
Statistical moments (mean, dispersion, skewness, kurtosis) of the diffuse tomograms were calculated using MATLAB software (operators 'hist', 'mean', 'STD', 'skewness', 'excess') to analyze distributions and differentiate between healthy and cancerous samples, with sensitivity, specificity, and balanced accuracy metrics computed.
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Digital camera
DMK 41AU02.AS
The Imaging Source
Records interference patterns
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He-Ne laser
Provides coherent light source for the optical setup
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Collimator
Forms parallel laser beam
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Beam splitter
Splits laser beam into irradiating and reference beams
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Optical mirror
Directs laser beams
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Polarizer
Forms specific polarization states of light
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Quarter wave plate
Achromatic True Zero-Order Waveplate
Converts polarization states, e.g., to circular polarization
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Polarizer
B + W Kaesemann XS-Pro Polarizer MRC Nano
B + W
Forms specific polarization states of light
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Microobjective
Nikon CFI Achromat P
Nikon
Obtains image of the object
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Personal computer
Workstation for data processing and control
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MATLAB software
MathWorks
Used for statistical analysis and calculations
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