Notification:
We are currently experiencing intermittent issues impacting performance. We apologize for the inconvenience.
By Topic

Method for locating a small magnetic object in the human body

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

5 Author(s)
Ilmoniemi, R.J. ; Low Temp. Lab., Helsinki Univ. of Technol., Espoo, Finland ; Williamson, S.J. ; Kaufman, L. ; Weinberg, H.J.
more authors

A piece of 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, the authors 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 modeled as a magnetic dipole, it was possible 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 3 mm.

Published in:

Biomedical Engineering, IEEE Transactions on  (Volume:35 ,  Issue: 7 )