Timing techniques for magnetic resonance imaging

Abstract

The disclosure is directed to techniques in which magnetic resonance imaging (MRI) is coordinated with the operation of an implantable medical device (IMD). By using an IMD to sense conditions, MRI can be improved because the sensed conditions can accurately define timing for application of electromagnetic radiation bursts. Moreover, by applying stimulation pulses specifically to coordinate the electromagnetic radiation bursts, the MRI may also be improved.

1 . A method comprising:
 receiving, with a magnetic resonance imagining (MRI) device, information from an implantable medical device (IMD);   defining, with the MRI device, timing of the electromagnetic radiation bursts based on the information received from the IMD; and   applying, with the MRI device, electromagnetic radiation bursts to a patient within which the IMD is implanted based on the defined timing.   
     
     
         2 . The method of  claim 1 , wherein receiving the information from the IMD comprises receiving information defining a timing of stimulation pulses applied to the patient by the IMD. 
     
     
         3 . The method of  claim 1 , further comprising applying, with the MRI device, one or more gradient magnetic fields based on the information received from the IMD. 
     
     
         4 . The method of  claim 1 , wherein receiving the information comprises receiving a control signal from the IMD that causes the MRI device to apply at least one of the electromagnetic radiation bursts. 
     
     
         5 . The method of  claim 1 , wherein receiving the information comprises receiving information to synchronize clocks between the MRI device and the IMD. 
     
     
         6 . The method of  claim 1 , wherein receiving the information comprises receiving the information via wireless telemetry. 
     
     
         7 . The method of  claim 1 , further comprising sending information regarding the timing of the electromagnetic radiation bursts to the IMD to control operation of the IMD. 
     
     
         8 . A device comprising:
 a telemetry unit to receive information from an implantable medical device (IMD);   a control unit that defines timing of electromagnetic radiation bursts based on information received from the IMD; and   electromagnetic radiation source that applies electromagnetic radiation bursts to a patient within which the IMD is implanted based on the defined timing.   
     
     
         9 . The device of  claim 8 , wherein the information received from the IMD comprises information defining the timing of the stimulation pulses applied to the patient by the IMD. 
     
     
         10 . The device of  claim 8 , further comprising a magnetic field generator that generates one or more gradient magnetic fields based on the information received from the IMD. 
     
     
         11 . The device of  claim 8 , wherein the information received from the IMD comprises a control signal that causes the device to apply at least one of the electromagnetic radiation bursts. 
     
     
         12 . The device of  claim 8 , wherein the control unit synchronizes the clock of the device with the clock of the IMD. 
     
     
         13 . The device of  claim 8 , wherein the telemetry unit sends information regarding the timing of the electromagnetic radiation bursts to the IMD to control operation of the IMD. 
     
     
         14 . A device comprising
 means for receiving information from an implantable medical device (IMD);   means for defining timing of the electromagnetic radiation bursts based on the information received from the IMD; and   means for applying electromagnetic radiation bursts to a patient within which the IMD is implanted based on the defined timing.   
     
     
         15 . The device of  claim 14 , wherein the receiving means receive information defining a timing of stimulation pulses applied to the patient by the IMD. 
     
     
         16 . The device of  claim 14 , wherein the receiving means receive the information via wireless telemetry. 
     
     
         17 . The device of  claim 14 , further comprising means for sending information regarding the timing of the electromagnetic radiation bursts to the IMD to control operation of the IMD.