Rangaraj M Rangayyan

Summary

Affiliation: University of Calgary
Country: Canada

Publications

  1. doi request reprint Measures of divergence of oriented patterns for the detection of architectural distortion in prior mammograms
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB, T2N 1N4, Canada
    Int J Comput Assist Radiol Surg 8:527-45. 2013
  2. pmc Segmentation and analysis of the glomerular basement membrane in renal biopsy samples using active contours: a pilot study
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB, Canada
    J Digit Imaging 23:323-31. 2010
  3. pmc Effect of pixel resolution on texture features of breast masses in mammograms
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, 2500 University Dr NW, Calgary, Alberta T2N1N4, Canada
    J Digit Imaging 23:547-53. 2010
  4. doi request reprint Modeling and classification of knee-joint vibroarthrographic signals using probability density functions estimated with Parzen windows
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, AB, Canada
    Conf Proc IEEE Eng Med Biol Soc 2008:2099-102. 2008
  5. doi request reprint Analysis of vibroarthrographic signals with features related to signal variability and radial-basis functions
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB, Canada
    Ann Biomed Eng 37:156-63. 2009
  6. pmc Automatic delineation of the diaphragm in computed tomographic images
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada
    J Digit Imaging 21:S134-47. 2008
  7. doi request reprint Landmarking and segmentation of computed tomographic images of pediatric patients with neuroblastoma
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
    Int J Comput Assist Radiol Surg 4:245-62. 2009
  8. pmc Detection of the optic nerve head in fundus images of the retina with Gabor filters and phase portrait analysis
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, 2500 University Drive NW, Calgary, AB, Canada
    J Digit Imaging 23:438-53. 2010
  9. pmc Computer-aided detection of architectural distortion in prior mammograms of interval cancer
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering, Schulich School of Engineering, Calgary, AB T2N1N4, Canada
    J Digit Imaging 23:611-31. 2010
  10. ncbi request reprint Screening of knee-joint vibroarthrographic signals using statistical parameters and radial basis functions
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering Schulich School of Engineering, University of Calgary, Calgary, AB, Canada
    Med Biol Eng Comput 46:223-32. 2008

Collaborators

Detail Information

Publications36

  1. doi request reprint Measures of divergence of oriented patterns for the detection of architectural distortion in prior mammograms
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB, T2N 1N4, Canada
    Int J Comput Assist Radiol Surg 8:527-45. 2013
    ..We propose a method for the detection of architectural distortion in prior mammograms of interval-cancer cases based on the expected orientation of breast tissue patterns in mammograms...
  2. pmc Segmentation and analysis of the glomerular basement membrane in renal biopsy samples using active contours: a pilot study
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB, Canada
    J Digit Imaging 23:323-31. 2010
    ..Comparison with manual measurements by an experienced renal pathologist indicated low error in the range of 36 +/- 11 nm...
  3. pmc Effect of pixel resolution on texture features of breast masses in mammograms
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, 2500 University Dr NW, Calgary, Alberta T2N1N4, Canada
    J Digit Imaging 23:547-53. 2010
    ..The texture features computed with the pixel size of 200 μm provided the highest average AUC with statistically highly significant differences as compared to all of the other pixel sizes tested, except 100 μm...
  4. doi request reprint Modeling and classification of knee-joint vibroarthrographic signals using probability density functions estimated with Parzen windows
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, AB, Canada
    Conf Proc IEEE Eng Med Biol Soc 2008:2099-102. 2008
    ..A classification accuracy of 73.03% was obtained with a database of 89 VAG signals. The screening efficiency was derived to be 0.6724, in terms of the area under the receiver operating characteristics curve...
  5. doi request reprint Analysis of vibroarthrographic signals with features related to signal variability and radial-basis functions
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB, Canada
    Ann Biomed Eng 37:156-63. 2009
    ..9174. The proposed methods could lead to objective criteria for improved selection of patients for clinical procedures and reduce healthcare costs...
  6. pmc Automatic delineation of the diaphragm in computed tomographic images
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada
    J Digit Imaging 21:S134-47. 2008
    ..Good agreement was observed between the results of segmentation and the reference contours drawn by the radiologist, with an average mean distance to the closest point of 5.85 mm over a total of 73 CT slices including the diaphragm...
  7. doi request reprint Landmarking and segmentation of computed tomographic images of pediatric patients with neuroblastoma
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
    Int J Comput Assist Radiol Surg 4:245-62. 2009
    ..In this context, we explore methods for identification and segmentation of several abdominal and thoracic landmarks to assist in the segmentation of neuroblastic tumors in pediatric CT images...
  8. pmc Detection of the optic nerve head in fundus images of the retina with Gabor filters and phase portrait analysis
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, 2500 University Drive NW, Calgary, AB, Canada
    J Digit Imaging 23:438-53. 2010
    ..FROC analysis indicated a sensitivity of 100% at 2.7 false positives per image. With the STARE database, FROC analysis indicated a sensitivity of 88.9% at 4.6 false positives per image...
  9. pmc Computer-aided detection of architectural distortion in prior mammograms of interval cancer
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering, Schulich School of Engineering, Calgary, AB T2N1N4, Canada
    J Digit Imaging 23:611-31. 2010
    ..80 at 7.6 false positives per image. The methods have good potential in detecting architectural distortion in mammograms of interval cancer cases...
  10. ncbi request reprint Screening of knee-joint vibroarthrographic signals using statistical parameters and radial basis functions
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering Schulich School of Engineering, University of Calgary, Calgary, AB, Canada
    Med Biol Eng Comput 46:223-32. 2008
    ..With a database of 89 VAG signals, screening efficiency of up to 0.82 was achieved, in terms of the area under the receiver operating characteristics curve, using a neural network classifier based on radial basis functions...
  11. ncbi request reprint Fractal analysis of contours of breast masses in mammograms via the power spectra of their signatures
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, AB, Canada, T2N 1N4
    Conf Proc IEEE Eng Med Biol Soc 2010:6737-40. 2010
    ..Tests with a dataset of 111 contours, including those of 65 benign masses and 46 malignant tumors, indicated a high classification performance of 0.89 in terms of the area under the receiver operating characteristic curve...
  12. ncbi request reprint Gabor filters and phase portraits for the detection of architectural distortion in mammograms
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB, Canada
    Med Biol Eng Comput 44:883-94. 2006
    ..The method was tested with 19 mammograms containing architectural distortion. In a preliminary experiment, a sensitivity of 84% was obtained at 7.8 false positives per image...
  13. pmc Fractal analysis of contours of breast masses in mammograms
    Rangaraj M Rangayyan
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada, T2N 1N4
    J Digit Imaging 20:223-37. 2007
    ..The combination of fractal dimension with fractional concavity yielded the highest area (A ( z )) under the ROC curve of 0.93; the two measures, on their own, resulted in A ( z ) values of 0.89 and 0.88, respectively...
  14. ncbi request reprint Detection of the temporal arcade in fundus images of the retina using the Hough transform
    Faraz Oloumi
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada, T2N 1N4
    Conf Proc IEEE Eng Med Biol Soc 2009:3585-8. 2009
    ..Results obtained with 40 images of the retina indicate accurate to acceptable results for 24 images and partial fits of the parabolic models for 11 images...
  15. doi request reprint Detection of architectural distortion in prior mammograms
    Shantanu Banik
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
    IEEE Trans Med Imaging 30:279-94. 2011
    ..Free-response receiver operating characteristics indicated sensitivities of 0.80 and 0.90 at 5.8 and 8.1 false positives per image, respectively, with the Bayesian classifier and the leave-one-image-out method...
  16. pmc Analysis of the glomerular basement membrane in images of renal biopsies using the split-and-merge method: a pilot study
    Ilya Kamenetsky
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB, T2N 1N4, Canada
    J Digit Imaging 23:463-74. 2010
    ..Comparative analysis of the results of image processing with manual measurements by an experienced renal pathologist indicated low error in the range of 12 +/- 9 nm...
  17. doi request reprint Segmentation and analysis of the glomerular basement membrane using the split and merge method
    Ilya Kamenetsky
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, AB, Canada
    Conf Proc IEEE Eng Med Biol Soc 2008:3064-7. 2008
    ..Comparative analysis of the results of image processing with manual measurements by an experienced renal pathologist indicated low error in the range of 12 +/- 9 nm...
  18. doi request reprint Detection of the optic disc in images of the retina using the Hough transform
    Xiaolu Zhu
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Alberta, Canada
    Conf Proc IEEE Eng Med Biol Soc 2008:3546-9. 2008
    ..The success rates including both good and acceptable detections were 92.50% using the Sobel operators and 80% using the Canny edge detector...
  19. doi request reprint Measures of angular spread and entropy for the detection of architectural distortion in prior mammograms
    Shantanu Banik
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
    Int J Comput Assist Radiol Surg 8:121-34. 2013
    ..We present methods for computer-aided detection of architectural distortion in mammograms acquired prior to the diagnosis of breast cancer in the interval between scheduled screening sessions...
  20. ncbi request reprint Characterization of architectural distortion in mammograms
    Fabio J Ayres
    Department of Electrical and Computer Engineering, University of Calgary, Canada
    IEEE Eng Med Biol Mag 24:59-67. 2005
  21. pmc Automatic segmentation of the ribs, the vertebral column, and the spinal canal in pediatric computed tomographic images
    Shantanu Banik
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, 2500 University Drive NW, Calgary, AB, Canada
    J Digit Imaging 23:301-22. 2010
    ..6 mm with SD = 0.5 mm, and the average MDCP was 0.6 mm with SD = 0.1 mm...
  22. ncbi request reprint Computer-aided diagnosis of knee-joint disorders via vibroarthrographic signal analysis: a review
    Yunfeng Wu
    Department of Electrical and Computer Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario, Canada
    Crit Rev Biomed Eng 38:201-24. 2010
    ..The final section is a perspective on the future and further development of VAG signal analysis...
  23. doi request reprint Landmarking of computed tomographic images to assist in segmentation of abdominal tumors caused by neuroblastoma
    Shantanu Banik
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Alberta, Canada
    Conf Proc IEEE Eng Med Biol Soc 2008:3126-9. 2008
    ..9%, on the average, over 10 CT exams, and improved the result of segmentation of neuroblastic tumors...
  24. ncbi request reprint Detection of architectural distortion in prior mammograms of interval-cancer cases with neural networks
    Shantanu Banik
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N1N4
    Conf Proc IEEE Eng Med Biol Soc 2009:6667-70. 2009
    ..Analysis of the performance of the methods with free-response receiver operating characteristics indicated a sensitivity of 0.80 at 10.5 false positives per image...
  25. pmc Computer-aided diagnosis of proliferative diabetic retinopathy via modeling of the major temporal arcade in retinal fundus images
    Faraz Oloumi
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB, Canada, T2N 1N4
    J Digit Imaging 26:1124-30. 2013
    ..87, 0.82, and 0.80, respectively. The proposed methods are expected to facilitate quantitative analysis of the architecture of the MTA, as well as assist in detection and diagnosis of PDR. ..
  26. doi request reprint Computer-aided diagnosis of proliferative diabetic retinopathy
    Faraz Oloumi
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB, Canada
    Conf Proc IEEE Eng Med Biol Soc 2012:1438-41. 2012
    ..94, 0.87, and 0.84, respectively. The proposed methods should facilitate improved quantitative analysis of the architecture of the MTA, as well as assist in detection, diagnosis, and improved treatment of PDR...
  27. pmc Detection of the optic nerve head in fundus images of the retina using the Hough transform for circles
    Xiaolu Zhu
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada
    J Digit Imaging 23:332-41. 2010
    ..8 mm) on the distance between the center of the detected circle and the manually identified center of the ONH, a successful detection rate of 90% was obtained with the DRIVE dataset...
  28. ncbi request reprint Three-dimensional segmentation of the tumor in computed tomographic images of neuroblastoma
    Hanford J Deglint
    Schulich School of Engieering, Department of Electrical and Computer Engineering, University of Calgary, Calgary, Alberta, Canada
    J Digit Imaging 20:263-78. 2007
    ..False-negative error rates of less than 12% were obtained in eight of 10 exams; however, seven of the exams had false-positive error rates of more than 20% with respect to manual segmentation of the tumor by a radiologist...
  29. ncbi request reprint Detection of blood vessels in fundus images of the retina using Gabor wavelets
    Faraz Oloumi
    Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB, Canada T2N 1N4
    Conf Proc IEEE Eng Med Biol Soc 2007:6452-5. 2007
    ..High efficiency in the detection of blood vessels with the area under the receiver operating characteristics curve of up to 0.96 was achieved...
  30. ncbi request reprint Classification of breast masses via nonlinear transformation of features based on a kernel matrix
    Tingting Mu
    Department of Electrical Engineering and Electronics, The University of Liverpool, Liverpool, Brownlow Hill L69 3GJ, UK
    Med Biol Eng Comput 45:769-80. 2007
    ..85 in terms of the area under the receiver operating characteristics curve (Az). The classification performance of all of the shape, edge-sharpness, and texture features, via KPLS transformation, was improved from 0.95 to 1.0 in Az value...
  31. ncbi request reprint Spiculation-preserving polygonal modeling of contours of breast tumors
    Denise Guliato
    Fac of Comput, Fed Univ of Uberlandia, Brazil
    Conf Proc IEEE Eng Med Biol Soc 1:2791-4. 2006
    ..The methods were tested with a set of 111 contours of 65 benign masses and 46 malignant tumors. A high classification accuracy of 0.93 in terms of the area under the receiver operating characteristics curve was obtained...
  32. doi request reprint Polygonal modeling of contours of breast tumors with the preservation of spicules
    Denise Guliato
    Faculdade de Computação, Universidade Federal de Uberlandia, Campus Santa Mônica Uberlândia, Minas Gerais, Brazil
    IEEE Trans Biomed Eng 55:14-20. 2008
    ..The methods were tested with a set of 111 contours of 65 benign masses and 46 malignant tumors. A high classification accuracy of 0.94 in terms of the area under the receiver operating characteristics curve was obtained...
  33. pmc Feature extraction from a signature based on the turning angle function for the classification of breast tumors
    Denise Guliato
    Faculdade de Computação, Universidade Federal de Uberlandia, Av João Naves de Avila 2121 38, 400 902, Minas Gerais, Brazil
    J Digit Imaging 21:129-44. 2008
    ..92, 0.92, 0.93, 0.93, and, 0.92, respectively...
  34. pmc Classification of breast masses using selected shape, edge-sharpness, and texture features with linear and kernel-based classifiers
    Tingting Mu
    Department of Electrical Engineering and Electronics, The University of Liverpool, Brownlow Hill, L69 3GJ, Liverpool, UK
    J Digit Imaging 21:153-69. 2008
    ..95 in terms of the area under the receiver operating characteristics curve. The results indicate that improvement in classification accuracy may be gained by using selected combinations of shape, edge-sharpness, and texture features...
  35. ncbi request reprint Strict 2-Surface Proximal Classification of Knee-joint Vibroarthrographic Signals
    Tingting Mu
    Department of Electrical Engineering and Electronics, The University of Liverpool, Brownlow Hill, Liverpool, UK, L69 3GJ
    Conf Proc IEEE Eng Med Biol Soc 2007:4911-4. 2007
    ..95 in Az value and 91.0% in average classification accuracy using the Gaussian kernel with the LOO procedure, and possessed good robustness around the selected kernel parameter...
  36. ncbi request reprint Cancellation of artifacts in ECG signals using a normalized adaptive neural filter
    Yunfeng Wu
    School of Information Engineering, Beijing University of Posts and Telecommunications, Haidian District, Beijing 100876, China
    Conf Proc IEEE Eng Med Biol Soc 2007:2552-5. 2007
    ..Moreover, the performance of the NANF in terms of the root-mean-squared error, normalized correlation coefficient, and filtered artifact entropy is significantly better than that of the popular least-mean-square (LMS) filter...