Research Papers: Imaging

Recognition algorithm for assisting ovarian cancer diagnosis from coregistered ultrasound and photoacoustic images: ex vivo study

[+] Author Affiliations
Umar Alqasemi

University of Connecticut, Biomedical Engineering Program, 371 Fairfield Way, U-2157, Storrs, Connecticut 06269

Patrick Kumavor, Andres Aguirre

University of Connecticut, Department of Electrical and Computer Engineering, 371 Fairfield Way, U-2157, Storrs, Connecticut 06269

Quing Zhu

University of Connecticut, Biomedical Engineering Program, 371 Fairfield Way, U-2157, Storrs, Connecticut 06269

University of Connecticut, Department of Electrical and Computer Engineering, 371 Fairfield Way, U-2157, Storrs, Connecticut 06269

J. Biomed. Opt. 17(12), 126003 (Dec 03, 2012). doi:10.1117/1.JBO.17.12.126003
History: Received August 20, 2012; Revised October 29, 2012; Accepted October 30, 2012
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Abstract.  Unique features and the underlining hypotheses of how these features may relate to the tumor physiology in coregistered ultrasound and photoacoustic images of ex vivo ovarian tissue are introduced. The images were first compressed with wavelet transform. The mean Radon transform of photoacoustic images was then computed and fitted with a Gaussian function to find the centroid of a suspicious area for shift-invariant recognition process. Twenty-four features were extracted from a training set by several methods, including Fourier transform, image statistics, and different composite filters. The features were chosen from more than 400 training images obtained from 33 ex vivo ovaries of 24 patients, and used to train three classifiers, including generalized linear model, neural network, and support vector machine (SVM). The SVM achieved the best training performance and was able to exclusively separate cancerous from non-cancerous cases with 100% sensitivity and specificity. At the end, the classifiers were used to test 95 new images obtained from 37 ovaries of 20 additional patients. The SVM classifier achieved 76.92% sensitivity and 95.12% specificity. Furthermore, if we assume that recognizing one image as a cancer is sufficient to consider an ovary as malignant, the SVM classifier achieves 100% sensitivity and 87.88% specificity.

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© 2012 Society of Photo-Optical Instrumentation Engineers

Citation

Umar Alqasemi ; Patrick Kumavor ; Andres Aguirre and Quing Zhu
"Recognition algorithm for assisting ovarian cancer diagnosis from coregistered ultrasound and photoacoustic images: ex vivo study", J. Biomed. Opt. 17(12), 126003 (Dec 03, 2012). ; http://dx.doi.org/10.1117/1.JBO.17.12.126003


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