Timothy Mate, MD, Radiation Oncologist, Tumor Institute Radiation Oncology Group, Swedish Cancer Institute, Seattle, WA, discusses transponders, or a GPS type system for the human body, for clinical applications such as a guide for targeting radiation.

References and Resources
Willoughby TR, Kupelian PA, Pouliot J, et al. Target localization and real-time tracking using the Calypso 4D localization system in patients with localized prostate cancer. Int J Radiat Oncol Biol Phys. 2006 Jun 1;65(2):528-34.

Food and Drug Administration, HHS. Medical devices; general hospital and personal use devices; classification of implantable radiofrequency transponder system for patient identification and health information. Fed Regist. 2004 Dec 10;69(237):71702-4.

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