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METHOD FOR THREE DIMENSIONAL NAVIGATION WITH SINGLE PLANE X-RAY SYSTEM

IP.com Disclosure Number: IPCOM000216294D
Publication Date: 2012-Mar-29
Document File: 5 page(s) / 55K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention provides a method for 3D navigation based on 3D position detection of point-like parts of medical devices by acquiring pairs of images with focal spot wobbling The 3D navigation method described herein, involves acquisition of images electromagnetically in a single plane X-ray system. Focal spot wobbling includes deflecting an electron beam electromagnetically in between. The 3D navigation method described herein is simple, cost effective and provides accurate positioning in less than a second.

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METHOD FOR THREE DIMENSIONAL NAVIGATION WITH SINGLE PLANE

X-RAY SYSTEM

FIELD OF INVENTION

The invention generally relates to three dimensional (3D) navigation of medical devices and more particularly to a method for 3D position tracking of point-like parts of medical devices by acquiring images based on focal spot wobble parallax in a single plane X-ray system.

 

BACKGROUND OF THE INVENTION

Generally available 3D navigation techniques are based on different physical phenomena such as magneto-static fields and infrared imaging.  Significant advances have been made in X-ray-only-navigation systems for percutaneous interventions that are typically small-sized and provide high-contrast.

Such X-ray-only-navigation systems provide accurate, real-time position information without additional exposure to ionizing radiation.  However, conventional navigation systems require careful registration between a navigation device coordinate system, a patient and an X-ray system.

X-ray-only-navigation systems rely either on bi-planar X-ray imaging systems or mechanical movement of X-ray source.  Bi-planar imaging systems are more costlier and bulkier than conventional mono-planar imaging systems.  Mechanical movement of X-ray source involves moving the whole positioner which brings about collision risk and inaccuracy due to travel time between image acquisition positions.  Such conventional navigation systems are expensive and complex.

Hence there exists a need for an improved method for 3D navigation that provides more accurate 3D position tracking.

BRIEF DESCRIPTION OF THE INVENTION

A method for 3D navigation based on 3D position detection of point-like parts of medical devices by acquiring pairs of images with focal spot wobbling.  Point-like parts of medical devices may include, for example, a tip of an electrophysiology ablation catheter.  The 3D navigation method described herein is simple, cost effective and provides accurate positioning in less than a second.  Since the 3D navigation method is based on X-ray system, that is readily available during most medical interventions, integration in clinical flow requires minimal effort.

DETAILED DESCRIPTION OF THE INVENTION

The invention provides a method for 3D navigation based on 3D position detection of point-like parts of medical devices by acquiring pairs of images with focal spot wobbling. Point-like parts of medical devices include, for example, tip of an electrophysiology ablation catheter.  The 3D navigation method described herein involves acquisition of images electromagnetically in a single plane X-ray system.  Focal spot wobbling includes deflecting an electron beam electromagnetically in between.

When moving the aforementioned focal spot of an X-ray tube by means of electromagnetic deflection (FS wobble) by DxFS, the image of the medical device moves on the detector plane represented by DxIM.  Distance of an object from the focal spot is represented as SOD (Source-to-Object-Distance). ...