Method for ascertaining an item of local specific absorption rate information and for ascertaining a measuring pulse group of radio frequency pulses, magnetic resonance facility, computer program, and electronically readable data carrier

A method for ascertaining a measuring pulse group of radio frequency pulses for use in a magnetic resonance measurement with a magnetic resonance facility, the method comprising:

• ascertaining, in an optimization procedure, the measuring pulse group for adhering to a boundary condition that limits a local specific absorption rate and/or for minimizing a maximum local specific absorption rate that occurs;
• and
• ascertaining an item of local specific absorption rate information in an object under an effect for candidate groups of radio frequency pulses, which are evaluated in the optimization procedure, wherein the radio frequency pulses are configured to manipulate nuclear spins of at least two different nuclides,
• wherein the radio frequency pulses implement a parallel transmission technique for at least one nuclide of the at least two different nuclides,
• wherein the radio frequency pulses are generated by controlling a radio frequency coil arrangement according to actuation variables assigned to the candidate group,
• wherein the boundary condition is adhered to and/or minimization takes place by using the ascertained item of local specific absorption rate information,
• wherein the item of local specific absorption rate information is ascertained by an ascertainment algorithm that uses the actuation variables as input data, and
• wherein the ascertainment algorithm is parameterized by taking into account the at least two different nuclides and respectively assigned logical coil channels thereof in such a way that the item of local specific absorption rate information is jointly ascertained for all nuclides with a same local location reference.

A magnetic resonance facility comprising:

• a radio frequency coil arrangement having a plurality of coil elements actuated via different physical coil channels and configured for imaging with manipulation of a plurality of nuclides;
• and
• a control facility configured to ascertain an item of local specific absorption rate information by an ascertainment algorithm that uses actuation variables as input data,
• wherein the ascertainment algorithm is parameterized by taking into account the plurality of nuclides and respectively assigned logical coil channels thereof in such a way that the item of local specific absorption rate information is jointly ascertained for all nuclides with a same local location reference,
• wherein radio frequency pulses are configured to manipulate nuclear spins of at least two different nuclides,
• wherein the radio frequency pulses implement a parallel transmission technique for at least one nuclide of the at least two different nuclides, and
• wherein the radio frequency pulses are generated by controlling the radio frequency coil arrangement according to actuation variables assigned to a candidate group.