Mass Screening of Breast Cancer by Ultrasound Transmission Technique : Theoretical Considerations : Acoustical Measurements and Instrumentation

A method of mass screening for breast cancer by ultrasound transmission technique is proposed. The method uses pulsed ultrasound waves that pass through the pressed breast. Distribution of mean velocity of transmission subtracted by a constant, e.g., velocity of ultrasound in water, should be displayed in an image. The feasibility of the method is theoretically discussed with the affirmative results. In this discussion, the thickness of the pressed breast is assumed to be 5×10-2 m, that of a malignant tumour to be 5×10-3 m. The velocity of ultrasound in normal tissue is assumed to be 1430 m/s, that in a tumour to be 1471 m/s.