Accession Number : ADD008403

Title :   Method and Apparatus for Physiologic Facsimile Imaging of Biologic Targets Based on Complex Permittivity Measurements Using Remote Microwave Interrogation.

Descriptive Note : Patent,


Personal Author(s) : Larsen,Lawrence E ; Jacobi,John H

Report Date : 27 Jan 1981

Pagination or Media Count : 17

Abstract : A physiologic facsimile image of a biological target is obtained by: scanning the target by transmitting a microwave signal through the target and measuring at least one of the amplitude and phase components of the complex microwave power transmission coefficient at each one of a plurality of sample locations which are spaced so as to define a two-dimensional array and such that a set of digital data for each of the measured components is obtained, and for at least one of the sets of data; sorting the set of data into column order; magnifying data derived from the sorting step so as to enhance the resolution of the image; mapping data derived from the magnifying step into further data using a predetermined mapping function so as to enhance the contrast between selected portions of the image; and obtaining the set of control signals by filtering data derived from the mapping step using a band pass function which rejects spatial frequencies below a predetermined first frequency and/or rejects spatial frequencies above a predetermined second frequency so as to minimize, respectively, the effects of variations in the thickness of the target and/or spurious frequencies resulting from the magnifying step. (Author)

Descriptors :   *Patents, *Images, Facsimile communication, Physiology, Microwaves, Facsimile transmission, Targets, Signals, Measurement

Subject Categories : Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE