Abstract

A~$stmct-lnstrumentation operating in the 0.5 to 1.0 MHz frequency range specifically designed for acoustic visualization of intracranial anatomy through the intact adult human skull is described. The instrumentation consists of a commercial B-mode scanner which has been extensively modified to enhance the reduced sensitivity and resolution inherent in such visualization schemes, as well as aid in the identification of intracranial anatomy. The instrumentation is described in three parts: a) the analog video system including transducers, pulsers, receiver, and associated circuitry; b) the digital video system which includes the analog-to-digital converter, signal processing for longitudinal and lateral resolution improvement, and the interface with the commercial unit; and c) the system for storing the scans and for overlaying the anatomical atlas information. Preliminary results of the use of this instrumentation to obtain transkull ultrasonic images are also presented.

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