Interventional MR imaging with motion compensation

Patent metadata

Field	Value
Publication number	US-9429637-B2
Application number	US-201013266261-A
Country	US
Kind code	B2
Filing date	Apr 14, 2010
Priority date	Apr 28, 2009
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

A method of magnetic resolution (MR) imaging of a moving portion of a body of a patient placed in an examination volume of a MR device. For the purpose of enabling improved interventional MR imaging from acquiring a MR signal data with motion compensation, the invention proposes that the method includes repeated acts of collecting tracking data from an interventional instrument introduced into the portion of the body, subjecting the portion of the body to an imaging sequence for acquiring one or more MR signals therefrom, wherein parameters of the imaging sequence are adjusted on the basis of the tracking data, and reconstructing one or more MR images from the MR signal data set.

First claim

The invention claimed is:

1. A method of magnetic resonance (MR) imaging of a moving portion of a body of a patient in an examination volume of a MR device, the method comprising acts of:
fixing the moving portion of the body to an instrument comprising a micro coil configured to generate tracking signals;
acquiring MR signal data producing an MR signal data set by repeatedly
generating tracking signals by the micro coil of the instrument,
deriving translation and/or rotation parameters describing motion of the moving portion of the body from the generated tracking signals,
adjusting imaging parameters to compensate for the motion of the moving portion of the body using the derived translation and/or rotation parameters,
subjecting the moving portion of the body to an MR imaging sequence using the adjusted imaging parameters, and
acquiring one or more MR signals in response to the MR imaging sequence and thereby producing the MR signal data set; and

reconstructing one or more MR images from the produced MR signal data set.

2. The method of claim 1 , wherein the act of adjusting comprising an act of maintaining a field of view in a temporally constant geometrical relationship with respect to the moving portion of the body.

3. The method of claim 1 , wherein a dynamic series of MR images is reconstructed from the acquired MR signal data.

4. The method of claim 1 , further comprising acts of:
detecting motion artefacts within a reconstructed MR image; and
identifying motion of the instrument relative to the moving portion of the body using the detected motion artefacts within the reconstructed MR image.

5. The method of claim 1 , further comprising acts of:
detecting a deviation of the motion of the instrument from a repetitive motion pattern on a basis of the collected tracking signals; and
identifying motion of the instrument relative to the moving portion of the body using the detected deviation of the motion of the instrument from the repetitive motion pattern.

6. The method of any claim 1 , wherein the act of subjecting the moving portion of the body to an imaging sequence comprises an act of subjecting the moving portion of the body to periodically rotated overlapping parallel lines with enhanced reconstruction (PROPELLER) sequence; and the act of adjusting adjusts position and/or angulation of individual k-space blades of the PROPELLER sequence on a basis of the generated tracking signals.

7. A magnetic resonance (MR) device comprising:
at least one main magnet coil for generating a uniform, steady magnetic field within an examination volume;
a plurality of gradient coils for generating switched magnetic field gradients in different spatial directions within the examination volume;
at least one RF coil for generating RF pulses within the examination volume and/or for receiving MR signals from a body of a patient positioned in the examination volume;
a controller configured to control the temporal succession of RF pulses and switched magnetic field gradients; and
a processor configured to control the MR device to acquire MR signal data producing an MR signal data set by repeatedly
generating tracking signals by a micro coil of an instrument fixed to a moving portion of the body of the patient,
deriving translation and/or rotation parameters describing motion of the moving portion of the body from the generated tracking signals
adjusting imaging parameters producing dusted imaging parameters to compensate for the motion of the moving portion of the body using the derived translation and/or rotation parameters, and
subjecting the moving portion of the body to an MR imaging sequence comprising RF pulses generated via the RF coil and switched magnetic field gradients generated via the gradient coils using the adjusted imaging parameters; and
reconstructing one or more MR images from the produced MR signal data set.

8. The MR device of claim 7 , wherein the micro coil is at least one RF micro coil.

9. The MR device of claim 7 , further comprising a system for collecting the tracking signals.

10. A computer readable non-transitory medium comprising a program which when executed on a magnetic resonance (MR) imaging device performs a method of MR imaging of a moving portion of a body of a patient placed in an examination volume of a MR device, the method comprising acts of:
acquiring MR signal data by repeatedly
generating tracking signals from a micro coil of an instrument fixed to the moving portion of the body,
deriving translation and/or rotation parameters describing motion of the moving portion of the body from the generated tracking signals,
adjusting imaging parameters producing adjusted imaging parameters to compensate for the motion of the moving portion of the body using the derived translation and/or rotation parameters, and
generating an imaging sequence and subjecting the moving portion of the body to the imaging sequence comprising a plurality of pulses and switched magnetic field gradients using the adjusted imaging parameters; and
reconstructing one or more MR images from the acquired MR signal data.

Assignees

• Krueger Sascha S
• Weiss Steffen
• David Bernd
• Lips Oliver
• Manzke Robert
• Koninklijke Philips Nv

Inventors

• Krueger Sascha S
• Weiss Steffen
• David Bernd
• Lips Oliver
• Manzke Robert

Classifications

• A61B5/064

  using markers (A61B5/062 takes precedence) · 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

• G01R33/4824

  using a non-Cartesian trajectory · CPC title

• G01R33/5673 Primary

  Gating or triggering based on a physiological signal other than an MR signal, e.g. ECG gating or motion monitoring using optical systems for monitoring the motion of a fiducial marker · CPC title

• A61B5/055

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