Magnetic field digitizer for stereotatic surgery
First Claim
Patent Images
1. A process of coordinating a position indicated by an electromagnetic position indicator with the position of an image on an imaging scan display system comprising the steps of:
- forming a set of scans representing a spatial view of a body;
transmitting an electromagnetic signal from a known point;
receiving said electromagnetic signal at a receiver and utilizing said received electromagnetic signal to compute a position coordinate of said receiver;
converting the position coordinate of said receiver into a scan coordinate;
projecting a scan image associated with said scan coordinate and visually indicating on said scan image a position relative from said known point, on said scan; and
calibrating said electromagnetic position indicator against a three dimensional reference to account for both the position of the body and a presence of any objects having an effect on the electromagnetic signal before the converting the position coordinate of said receiver into scan coordinates step.
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Abstract
The present invention enables stereotactic surgery with a minimal structure present in order to facilitate surgery yet with enhanced accuracy in stereotactic imaging assistance to the surgeon. This device and method is known as "frameless" stereotaxis system, and uses coordinate referencing between the CT or MRI scans and a stereotactic referencing system which uses an electromagnetically driven system to determine the location of a stylus.
281 Citations
5 Claims
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1. A process of coordinating a position indicated by an electromagnetic position indicator with the position of an image on an imaging scan display system comprising the steps of:
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forming a set of scans representing a spatial view of a body; transmitting an electromagnetic signal from a known point; receiving said electromagnetic signal at a receiver and utilizing said received electromagnetic signal to compute a position coordinate of said receiver; converting the position coordinate of said receiver into a scan coordinate; projecting a scan image associated with said scan coordinate and visually indicating on said scan image a position relative from said known point, on said scan; and calibrating said electromagnetic position indicator against a three dimensional reference to account for both the position of the body and a presence of any objects having an effect on the electromagnetic signal before the converting the position coordinate of said receiver into scan coordinates step. - View Dependent Claims (2, 3)
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4. A process of coordinating a position indicated by an electromagnetic position indicator with the position of an image on an imaging scan display system comprising the steps of:
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forming a set of scans representing a spatial view of a body; transmitting an electromagnetic signal from a known point; receiving said electromagnetic signal at a receiver and utilizing said received electromagnetic signal to compute a position coordinate of said receiver; converting the position coordinate of said receiver into a scan coordinate; projecting a scan image associated with said scan coordinate and visually indicating on said scan image a position relative from said known point on said scan; computing a first midpoint reference based upon at least three position coordinates and computing a second midpoint reference based upon at least three associated scan coordinates; setting said first midpoint reference equivalent to said second midpoint reference; and computing a coordinate rotation of one of said first and second midpoint references with respect to the other of said midpoint references. - View Dependent Claims (5)
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Specification