Accession Number : ADB159962
Title : Lateral Wave Locator for Radiotransparent Foreign Bodies. Phase 1.
Descriptive Note : Final rept. 15 Jan-15 Jul 91,
Corporate Author : GEO-CENTERS INC NEWTON CENTRE MA
Personal Author(s) : Sandler, Sheldon S.
Report Date : 15 JUL 1991
Pagination or Media Count : 58
Abstract : It is theoretically possible to detect plastic fragment in the human body. A lateral wave locator will need to operate, in general, in the fleshy parts of the body, since large bone reflections are possible. These parts include the abdomen, buttocks, and fleshy parts of the leg and hips. With the help of an experimental probe development set-up, many of the practical considerations for realization have been identified. Considerations include a nulling circuit for canceling out the direct wave and shielding to reduce noise. Details in the design of the probe are now evident: (1) the desired mode of operation is C.W. with an operating frequency of 10 GHz; (2) a thin layer of a polyfoam type material is needed to press the dipoles against the body; (3) tuning is required to resonate the dipoles; (4) the dipoles must be collinear; and (5) in many cases bone can be differentiated from fragments through the polarization response. As a rule of thumb, it is possible to detect fragments in the range from millimeters to centimeters at depths up to 10 cm. The maximum depth for detection depends on fragment size. Based on the present limited experimental probe design work, many of the practical problems have been identified.
Descriptors : *WAVES, ABDOMEN, BONES, BUTTOCKS, FOREIGN, HUMAN BODY, PARTS, PROBES, REFLECTION.
Subject Categories : Medical Facilities, Equipment and Supplies
Electricity and Magnetism
Distribution Statement : APPROVED FOR PUBLIC RELEASE