Magnetic resonance guidance of a shaft to a target zone

Patent metadata

Field	Value
Publication number	US-9968277-B2
Application number	US-201214007990-A
Country	US
Kind code	B2
Filing date	Apr 4, 2012
Priority date	Apr 7, 2011
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A medical apparatus ( 1100 ) comprising a magnetic resonance imaging system and an interventional device ( 300 ) comprising a shaft ( 302, 1014, 1120 ). The medical apparatus further comprises a toroidal magnetic resonance fiducial marker ( 306, 600, 800, 900, 1000, 1122 ) attached to the shaft. The shaft passes through a center point ( 610, 810, 908, 1006 ) of the fiducial marker. The medical apparatus further comprises machine executable instructions ( 1150, 1152, 1154, 1156, 1158 ) for execution by a processor. The instructions cause the processor to acquire ( 100, 200 ) magnetic resonance data, to reconstruct ( 102, 202 ) a magnetic resonance image ( 1142 ), and to receive ( 104, 204 ) the selection of a target volume ( 1118, 1144, 1168 ). The instructions further cause the processor to repeatedly: acquire ( 106, 206 ) magnetic resonance location data ( 1146 ) from the fiducial marker and render ( 108, 212 ) a view ( 1148, 1162 ) indicating the position of the shaft relative to the target zone.

First claim

The invention claimed is:

1. A medical system comprising:
a magnetic resonance imaging system for acquiring magnetic resonance data from a subject;
an interventional device comprising a shaft, wherein the shaft includes a distal portion that is adapted for being inserted into the subject, and a proximal portion that remains external to the subject;
a first magnetic resonance fiducial marker attached to the proximal portion of the shaft, the first magnetic resonance fiducial marker including:
a toroidal magnetic resonance signal volume that provides a first signal when the toroidal magnetic resonance signal volume is exposed to magnetic resonance signals from the magnetic resonance imaging system, and
a coil that is electromagnetically coupled to the toroidal magnetic resonance signal volume

and provides a second signal based on the first signal, wherein the shaft passes through a center point of the first magnetic fiducial marker;
a processor; and
a memory storing machine executable instructions for execution by the processor,
wherein execution of the instructions cause the processor to acquire the magnetic resonance data, wherein execution of the instructions further cause the processor to reconstruct the magnetic resonance data into a magnetic resonance image, wherein execution of the instructions further cause the processor to receive a selection of a target volume within the magnetic resonance image,
wherein execution of the instructions further cause the processor to repeatedly:
acquire magnetic resonance location data from the second signal from the coil of the first magnetic resonance fiducial marker using the magnetic resonance imaging system, wherein the magnetic resonance location data is descriptive of a location of the toroidal magnetic resonance signal volume; and
render a view on a display device indicating a position of at least the distal portion of the shaft relative to the target volume when the distal portion is inserted into the subject, wherein the view is determined using at least the magnetic resonance location data and a location of the target volume.

2. The medical system of claim 1 , wherein execution of the instructions further causes the processor to repeatedly:
re-acquire the magnetic resonance data;
reconstruct the magnetic resonance image using the re-acquired magnetic resonance data, wherein the view comprises the magnetic resonance image.

3. The medical system of claim 1 , wherein the coil comprises a magnetic resonance receive coil surrounding the toroidal magnetic resonance signal volume.

4. The medical system of claim 1 , wherein the system includes a second magnetic resonance fiducial marker that is configured to be external to the patient and is adapted for guiding the shaft through a center point of the second magnetic resonance fiducial marker, and wherein the magnetic resonance location data is further descriptive of a location of the second magnetic resonance fiducial marker.

5. The medical system of claim 4 , wherein the second magnetic resonance fiducial marker comprises a magnetic resonance receive coil.

6. The medical system of claim 4 , wherein the magnetic resonance location data includes the shaft position and an orientation of the shaft, and execution of the instructions further cause the processor to determine the magnetic resonance location data by:
locating a first center point of the first magnetic resonance fiducial marker and a second center point of the second magnetic resonance fiducial marker using the magnetic resonance location data; and
calculating the shaft position and orientation using at least the first and second located center points.

7. The medical system of claim 4 , wherein the view is two-dimensional, wherein the second fiducial marker corresponds to a shaft entry point that is descriptive of a location where the shaft enters the subject, wherein the view is determined at least using the shaft entry point.

8. The medical system of claim 4 , wherein the shaft passes through a center point of the first and second magnetic resonance fiducial marker.

9. The medical system of claim 1 , wherein execution of the instructions further cause the processor to:
determine an orientation of the first magnetic resonance fiducial marker using the magnetic resonance location data; and
calculate a shaft position using at least a located center point and the orientation of the first magnetic resonance location marker.

10. The medical system of claim 1 , wherein the coil includes a resonant coil and capacitor arrangement.

Assignees

• Weiss Steffen
• Holthuizen Ronaldus Frederik Johannes
• Krueger Sascha
• Koken Peter
• Wirtz Daniel
• Amthor Thomas Erik
• Uhlemann Falk
• Koninklijke Philips Nv

Inventors

• Weiss Steffen
• Holthuizen Ronaldus Frederik Johannes
• Krueger Sascha
• Koken Peter
• Wirtz Daniel
• Amthor Thomas Erik
• Uhlemann Falk

Classifications

• G01R33/34084

  implantable coils or coils being geometrically adaptable to the sample, e.g. flexible coils or coils comprising mutually movable parts · CPC title

• G01R33/287

  involving active visualization of interventional instruments, e.g. using active tracking RF coils or coils for intentionally creating magnetic field inhomogeneities · CPC title

• A61B5/055 Primary

  involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging · CPC title

• A61B5/72

  Signal processing specially adapted for physiological signals or for diagnostic purposes · CPC title

• A61B5/6832

  using adhesives (conductive adhesive for bioelectric electrodes A61B5/259) · CPC title