Accession Number : ADA193361

Title :   Method for Locating a Small Magnetic Object in the Human Body,

Corporate Author : NEW YORK UNIV N Y

Personal Author(s) : Kaufman, Lloyd ; Williamson, Samuel J ; Ilmoniemi, Risto J ; Weinberg, Harold ; Boyd, Arthur D

PDF Url : ADA193361

Report Date : 29 Feb 1988

Pagination or Media Count : 15

Abstract : A piece of a thin acupuncture needle lodged under the right scapula of a patient could not be found in surgical procedures accompanied by studies of 30 standard X-ray images. To locate it, we mapped the magnetic field component normal to a plane lying above the object, using a superconducting quantum interference device (SQUID). Assuming that the needle could be modelled as a magnetic dipole, we were able to infer its lateral position, depth, orientation, and magnetic moment. With this information, directed CT scans, high-resolution X-ray films, and the subsequent surgical removal of the needle proved that it could be located in the body with an accuracy of about three millimeters.

Descriptors :   *ACUPUNCTURE, *NEEDLES, *SURGERY, *MAGNETIC DETECTION, ACCURACY, HIGH RESOLUTION, HUMAN BODY, INTERFERENCE, MAGNETIC FIELDS, MAGNETIC MOMENTS, QUANTUM THEORY, SUPERCONDUCTIVITY, X RAY FILM, SUPERCONDUCTORS

Subject Categories : Medicine and Medical Research
      Medical Facilities, Equipment and Supplies

Distribution Statement : APPROVED FOR PUBLIC RELEASE