US 12,216,187 B2 · Correcting object movement during MR imaging

Abstract

The disclosure relates to a method for correcting a movement of an object occurring during an MR image acquisition. The method includes: determining a motion model describing possible movements of the object based on a defined number of degrees of freedom; detecting a motion of a marker provided on the object with a motion sensor; determining a description of the motion model in a common coordinate system; determining the motion of the marker in the common coordinate system; determining a first motion of the object in the common coordinate system using the description of the motion model, the first motion being the motion that best matches the determined motion of the marker in the common coordinate system using the defined number of degrees of freedom; and correcting the movement of the object based on the determined first motion in order to determine at least one motion corrected MR image.

Claims18

Dependent claims

A method for correcting a movement of an object occurring during a magnetic resonance (MR) image acquisition in which MR signals of the object are detected, the method comprising:

determining a motion model describing possible movements of the object based on a model function having a defined number of degrees of freedom the object is able to use for the movement, wherein the defined number of degrees of freedom of the object is less than all six degrees of freedom possible for rigid body motion;
detecting a motion of a marker provided on the object with a motion sensor;
checking whether the object is configured to carry out the detected motion of the marker taking into account the defined number of degrees of freedom the object is able to use for the movement;
determining a description of the motion model in a common coordinate system having the defined number of degrees of freedom;
determining the motion of the marker in the common coordinate system;
determining a first motion of the object in the common coordinate system using the description of the motion model, wherein the first motion is a motion that best matches the determined motion of the marker in the common coordinate system using only the defined number of degrees of freedom;
and
correcting the movement of the object based on the determined first motion in order to determine at least one motion corrected MR image, wherein a corresponding part of the detected motion of the marker is excluded from the correction when the checking identifies that the detected motion of the marker does not originate from the defined number of degrees of freedom of the object.

5 more elements

A device configured to correct a movement an object occurring during a magnetic resonance (MR) image acquisition in which MR signals of the object are detected, the device comprising:

at least one processing unit;
and
a memory comprising instructions, when executed by the at least one processing unit, cause the device to:
determine a motion model describing possible movements of the object based on a defined number of degrees of freedom the object is able to move, wherein the defined number of degrees of freedom of the object is less than all six degrees of freedom possible for rigid body motion;
detect a motion of a marker provided on the object with a motion sensor;
determine a description of the motion model in a common coordinate system having the defined number of degrees of freedom;
determine the motion of the marker in the common coordinate system;
determine a first motion of the object in the common coordinate system using the description of the motion model, wherein the first motion is a motion that best matches the determined motion of the marker in the common coordinate system using only the defined number of degrees of freedom;
and
correct the movement of the object based on the determined first motion in order to determine at least one motion corrected MR image,
wherein the object is head of a human,
wherein the motion model has a total of three degrees of freedom with two rotational degrees of freedom and one translational degree of freedom,
wherein the two rotational degrees of freedom comprise a nodding rotation of the head in an up-down direction and a left-right rotation of the head, and
wherein the one translation degree of freedom comprises a cranial caudal movement of the head.

11 more elements

Dependencies are inferred from the claim text.

Correcting object movement during MR imaging

Life of this patent

Correcting object movement during MR imaging

Life of this patent

Abstract

Claims18