METHOD FOR CALCULATING AN OPERATING PARAMETER OF A MAGNETIC RESONANCE SEQUENCE, MAGNETIC RESONANCE APPARATUS AND COMPUTER PROGRAM PRODUCT
A method for calculating an operating parameter of a magnetic resonance sequence, a magnetic resonance apparatus, and a computer program product are disclosed. According to the method, at least one initial sequence parameter of a radio-frequency (RF) transmit pulse of the magnetic resonance sequence is provided. In addition, at least one test RF transmit pulse is determined, (e.g., calculated and/or modeled and/or simulated), wherein the at least one test RF transmit pulse is adapted based on the at least one initial sequence parameter to a specified, in particular geometric, standard shape. The at least one operating parameter is determined, (e.g., calculated), with the assistance of the at least one test RF transmit pulse. It is in particular assumed in this respect that the at least one test RF transmit pulse is applied on performance of the magnetic resonance sequence.
1 . A computer-implemented method for calculating at least one operating parameter of a magnetic resonance sequence, the method comprising:
providing at least one initial sequence parameter of a radio-frequency (RF) transmit pulse of the magnetic resonance sequence;
determining at least one test RF transmit pulse, wherein the at least one test RF transmit pulse is adapted based on the at least one initial sequence parameter to a specified standard shape; and
determining the at least one operating parameter of the magnetic resonance sequence using the at least one test RF transmit pulse.
2 . The method of claim 1 , wherein the specified standard shape is a rectangular shape.
3 . The method of claim 2 , wherein the at least one initial sequence parameter comprises a pulse duration that corresponds to a width of the rectangular shape.
4 . The method of claim 3 , wherein the pulse duration is a maximum pulse duration, and
wherein the width of the rectangular shape is a maximum width of the rectangular shape.
5 . The method of claim 2 , wherein the at least one initial sequence parameter comprises an amplitude that corresponds to a height of the rectangular shape.
6 . The method of claim 5 , wherein the amplitude is a maximum amplitude, and
wherein the height of the rectangular shape is a maximum height of the rectangular shape.
7 . The method of claim 1 , wherein the at least one operating parameter comprises a power requirement applicable to a magnetic resonance apparatus during operation of the magnetic resonance sequence.
8 . The method of claim 7 , wherein the power requirement is applicable to a RF amplifier of the magnetic resonance apparatus.
9 . The method of claim 1 , wherein the at least one operating parameter comprises a specific absorption rate to which a patient is exposed during operation of the magnetic resonance sequence.
10 . The method of claim 1 , further comprising:
providing at least one constraint for the at least one operating parameter; and
determining at least one adapted sequence parameter by adapting the at least one initial sequence parameter to comply with the at least one constraint.
11 . The method of claim 10 , further comprising:
determining at least one measurement RF transmit pulse based on the at least one adapted sequence parameter.
12 . The method of claim 11 , wherein the at least one measurement RF transmit pulse is a dynamic pulse.
13 . The method of claim 11 , wherein the at least one measurement RF transmit pulse is a pTx pulse.
14 . The method of claim 11 , wherein the at least one adapted sequence parameter comprises a constraint for determining the at least one measurement RF transmit pulse.
15 . The method of claim 14 , wherein the constraint for determining the at least one measurement RF transmit pulse comprises a maximum pulse duration.
16 . The method of claim 14 , wherein the constraint for determining the at least one measurement RF transmit pulse comprises a maximum amplitude.
17 . A magnetic resonance apparatus comprising:
at least one processor configured to:
provide at least one initial sequence parameter of a radio-frequency (RF) transmit pulse of a magnetic resonance sequence;
determine at least one test RF transmit pulse, wherein the at least one test RF transmit pulse is adapted based on the at least one initial sequence parameter to a specified standard shape; and
determine the at least one operating parameter of the magnetic resonance sequence using the at least one test RF transmit pulse.
18 . A computer program product that comprises a program and is directly loadable into a memory of a programmable system control unit of a magnetic resonance apparatus, wherein the program, when executed by the programmable system control unit, is configured to cause the magnetic resonance apparatus to:
provide at least one initial sequence parameter of a radio-frequency (RF) transmit pulse of a magnetic resonance sequence;
determine at least one test RF transmit pulse, wherein the at least one test RF transmit pulse is adapted based on the at least one initial sequence parameter to a specified standard shape; and
determine the at least one operating parameter of the magnetic resonance sequence using the at least one test RF transmit pulse.