7,080 research outputs found
A Hybrid Approach of Using Wavelets and Fuzzy Clustering for Classifying Multispectral Florescence In Situ Hybridization Images
Multicolor or multiplex fluorescence in situ
hybridization (M-FISH) imaging is a recently developed molecular
cytogenetic diagnosis technique for rapid visualization of genomic
aberrations at the chromosomal level. By the simultaneous use of
all 24 human chromosome painting probes, M-FISH imaging
facilitates precise identification of complex chromosomal
rearrangements that are responsible for cancers and genetic
diseases. The current approaches, however, cannot have the
precision sufficient for clinical use. The reliability of the
technique depends primarily on the accurate pixel-wise
classification, that is, assigning each pixel into one of the 24
classes of chromosomes based on its six-channel spectral
representations. In the paper we introduce a novel approach to
improve the accuracy of pixel-wise classification. The approach is
based on the combination of fuzzy clustering and wavelet
normalization. Two wavelet-based algorithms are used to reduce
redundancies and to correct misalignments between multichannel
FISH images. In comparison with conventional algorithms, the
wavelet-based approaches offer more advantages such as the
adaptive feature selection and accurate image registration. The
algorithms have been tested on images from normal cells, showing
the improvement in classification accuracy. The increased accuracy
of pixel-wise classification will improve the reliability of the
M-FISH imaging technique in identifying subtle and cryptic
chromosomal abnormalities for cancer diagnosis and genetic
disorder research
Effects of discrete wavelet compression on automated mammographic shape recognition
At present early detection is critical for the cure of breast cancer. Mammography is a breast screening technique which can detect breast cancer at the earliest possible stage. Mammographic lesions are typically classified into three shape classes, namely round, nodular and stellate. Presently this classification is done by experienced radiologists. In order to increase the speed and decrease the cost of diagnosis, automated recognition systems are being developed. This study analyses an automated classification procedure and its sensitivity to wavelet based image compression; In this study, the mammographic shape images are compressed using discrete wavelet compression and then classified using statistical classification methods. First, one dimensional compression is done on the radial distance measure and the shape features are extracted. Second, linear discriminant analysis is used to compute the weightings of the features. Third, a minimum distance Euclidean classifier and the leave-one-out test method is used for classification. Lastly, a two dimensional compression is performed on the images, and the above process of feature extraction and classification is repeated. The results are compared with those obtained with uncompressed mammographic images
Wavelet feature extraction and genetic algorithm for biomarker detection in colorectal cancer data
Biomarkers which predict patient’s survival can play an important role in medical diagnosis and
treatment. How to select the significant biomarkers from hundreds of protein markers is a key step in
survival analysis. In this paper a novel method is proposed to detect the prognostic biomarkers ofsurvival in colorectal cancer patients using wavelet analysis, genetic algorithm, and Bayes classifier. One dimensional discrete wavelet transform (DWT) is normally used to reduce the dimensionality of biomedical data. In this study one dimensional continuous wavelet transform (CWT) was proposed to extract the features of colorectal cancer data. One dimensional CWT has no ability to reduce
dimensionality of data, but captures the missing features of DWT, and is complementary part of DWT. Genetic algorithm was performed on extracted wavelet coefficients to select the optimized features, using Bayes classifier to build its fitness function. The corresponding protein markers were
located based on the position of optimized features. Kaplan-Meier curve and Cox regression model 2 were used to evaluate the performance of selected biomarkers. Experiments were conducted on colorectal cancer dataset and several significant biomarkers were detected. A new protein biomarker CD46 was found to significantly associate with survival time
Application of Fractal and Wavelets in Microcalcification Detection
Breast cancer has been recognized as one or the most frequent, malignant tumors in women, clustered microcalcifications in mammogram images has been widely recognized as an early sign of breast cancer. This work is devote to review the application of Fractal and Wavelets in microcalcifications detection
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