Accession Number : ADA328034

Title :   Early Detection of Breast Cancer on Mammograms Using: Perceptual Feedback, Computer Processed Images and Ultrasound.

Descriptive Note : Final rept. 31 Dec 92-30 Apr 96,

Corporate Author : PENNSYLVANIA UNIV PHILADELPHIA

Personal Author(s) : Bloch, Peter

PDF Url : ADA328034

Report Date : APR 1996

Pagination or Media Count : 35

Abstract : Several approaches for impraving the detection of small tumors m the breast9 were explored. These included; (1) Perceptual feedback to decrease errors in missing tumors that are actually visible on the initial screening mammogram. The observers head-eye-position was recorded while viewing mammograms. It was found that false negative decisions in identifying a lesion was associated with prolonged dwell time. Visual feedback, obtained by placing a small circle on the image surrounding the suspicious region (as predicted by the gaze duration), enhanced the detectability or masses. (2) Computer processing of screening mammograms for detection of clusters of microcalcifications and parenchyma patterns associated with developing lesions. Preserving the high spatial resolution and wide latitude in the digitized mammogram was found important for computer aided detection of subtle microcalcifications. Elevated mammography density has been associated with an increased risk of developing breast cancer. An algorithm was developed to perform quantification of the. elevated parenchyma density on digitized mammograms. (3) High resolution ultrasound. The ultrasound distortion in the female breast image were identified and compensating algorithm developed to reduce the distortions. Design considerations were performed for two dimensional large acoustic transducers for high resolution breast imaging. The analysis indicates that using a 2D array would significantly increase the resolution of ultrasound mammography.

Descriptors :   *IMAGE PROCESSING, *DETECTION, *NEOPLASMS, *VISUAL PERCEPTION, *MAMMARY GLANDS, *BREAST CANCER, *MAMMOGRAPHY, ALGORITHMS, SPATIAL DISTRIBUTION, DENSITY, RISK, DECISION MAKING, COMPUTER AIDED DESIGN, COMPUTERS, RESOLUTION, HIGH RESOLUTION, CLUSTERING, ULTRASONICS, FEEDBACK, VISION, COMPENSATION, DISTORTION, PERCEPTION, DWELL TIME, LESIONS, LATITUDE, CIRCLES.

Subject Categories : Anatomy and Physiology
      Medicine and Medical Research
      Cybernetics

Distribution Statement : APPROVED FOR PUBLIC RELEASE