Interventional MR imaging with motion compensation

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.

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.