title: Ultrasonic Scanning of Biologic Tissue by a New Technique.
abstract: The size of the ultrasonic beam and beam dispersion severely limit resolution by two-dimensional scanning systems. Resoluti and tissue penetration are improved by using a highly focused, ultrasonic transducer array in conjunction with an electronic timing system for the selection of particular echo information.
authors.forename: F L
authors.initials: FL
authors.lastname: Thurstone
authors.forename: N I
authors.initials: NI
authors.lastname: Kjosnes
authors.forename: W M
authors.initials: WM
authors.lastname: McKinney