Fiducial marker system for subject movement compensation during medical treatment

摘要

A system is provided for subject movement compensation during a medical procedure. The system uses passive radiofrequency identification tags associated with a subject, and at least one active RFID reader is positioned to interrogate the position of at least three such passive radiofrequency identification tags so as to triangulate the geometric position of a subject body tissue. The reader generates an output signal corresponding to a distance between said reader and a tag. A microprocessor calculates a displacement of a tag relative to the reader from said output signal to yield a value corresponding to subject movement. A medical device operates in synchronicity with the calculation corresponding to subject movement to compensate for subject movement during a treatment process in essentially real time. A process for subject movement compensation during a medical procedure is also provided.

主权项

1. A system for subject movement compensation during a medical procedure performed using a medical device, the system comprising:
a treatment platform for supporting a subject during the medical procedure; a first set of at least one fixed passive radiofrequency identification (RFID) tag, where said at least one fixed RFID tag is adapted to be secured in a fixed positional relationship relative to a target related to the subject; a second set of a plurality of passive RFID tags secured to an elastomeric belt for encompassing the subject and positioned above the treatment platform, where said elastomeric belt is adapted to be secured to an exterior surface of the subject; a plurality of RFID readers positioned to interrogate said at least one fixed RFID tag and said second set of the plurality of passive RFID tags secured to said elastomeric belt, said plurality of RFID readers configured to generate a set of output signals corresponding to respective distances between said plurality of RFID readers and each of said at least one fixed RFID tags and said plurality of passive RFID tags secured to said elastomeric belt and wherein said plurality of RFID readers are further configured to interrogate said first set and said second set of RFID tags successively at short time intervals or continuously; a microprocessor configured to calculate based on said set of output signals displacements of said at least one fixed passive RFID tag and said second set of the plurality of passive RFID tags secured to said elastomeric belt to yield a value corresponding to subject movement that is translational, rotational, or respirational after one or more breathing cycles is made and configured to feed coordinate adjustments determined based on said value to said medical device; and wherein said medical device is configured to continuously move during the medical procedure with respect to a position of said target in synchronicity with said microprocessor calculation corresponding to the value of subject movement, wherein said plurality of RFID readers are secured to a portion of said medical device that is configured to be continuously controlled in real-time during the medical procedure in response to the coordinate adjustments from said microprocessor without interrupting or delaying the performance of the medical procedure.