Method for providing setting parameter sets for a magnetic resonance facility, method for operating a magnetic resonance facility, provision facility, magnetic resonance facility and computer program

Patent metadata

Field	Value
Publication number	US-11609289-B2
Application number	US-202017030744-A
Country	US
Kind code	B2
Filing date	Sep 24, 2020
Priority date	Sep 25, 2019
Publication date	Mar 21, 2023
Grant date	Mar 21, 2023

Abstract

In a method for providing setting parameter sets for at least one measuring protocol described by protocol parameters for acquiring magnetic resonance data with a magnetic resonance facility, setting parameter set is determined for each of at least two temperature status categories of the magnetic resonance facility using a temperature model describing a development of a temperature status of at least one component of the magnetic resonance facility. The method also includes preventing overheating of the at least one component due to the measurement with the measuring protocol being repeated a maximum number of times for a specified number of repetitions.

First claim

The invention claimed is:

1. A method for providing setting parameter sets for a measuring protocol described by protocol parameters for acquiring magnetic resonance data with a magnetic resonance facility, comprising:
determining at least one model parameter of a temperature model in a calibration measurement with the magnetic resonance facility, wherein a magnetic resonance sequence is used for the calibration measurement that incorporates a known mean gradient power;
determining at least two temperature status categories of the magnetic resonance facility based on corresponding usage categories of the magnetic resonance facility, each of the at least two temperature status categories being different and including at least one different temperature status of at least one component of the magnetic resonance facility;
determining a different setting parameter set for each of the at least two temperature status categories of the magnetic resonance facility using the temperature model describing a development of the different temperature statuses of the at least one component of the magnetic resonance facility, the at least one component being heated when the measuring protocol is run, wherein the setting parameter set includes specified values for at least some of the protocol parameters and/or specified value ranges for at least some of the protocol parameters;
determining a current temperature status category from the at least two temperature status categories based on: a comparison of a current temperature status of at least one component and the different temperature statuses of the at least two temperature status categories, and/or a usage category of the magnetic resonance facility; and
selecting a corresponding one of the different setting parameter sets, based on the determined current temperature status category, to determine corresponding protocol parameters for the measuring protocol to prevent, during running of the measuring protocol and at a beginning of a measurement with the measuring protocol, overheating of the at least one component due to the measurement with the measuring protocol being repeated a maximum number of times for a specified number of repetitions, the overheating being defined by a limit temperature being exceeded, wherein the different setting parameter sets are determined such that the overheating is prevented for each starting temperature status included in a temperature status category of at least two temperature status categories.

2. The method as claimed in claim 1 , wherein the temperature status categories are defined by evaluating starting temperature statuses determined when using a structurally identical magnetic resonance facility for specification information that describes the measuring protocol.

3. The method as claimed in claim 2 , wherein the specification information is in a form broken down according to at least one usage category, wherein the evaluation and/or definition of the temperature status categories takes place as a function of the at least one usage category.

4. The method as claimed in claim 2 , wherein at least some of the temperature status categories are determined in such a way that a specified proportion of the starting temperature statuses of the specification information is included, wherein the specification information is considered specific to at least one usage category and which rules out starting temperature statuses with the highest temperatures, is included.

5. The method as claimed in claim 1 , wherein at least some of the temperature status categories are defined by threshold values for the temperature of the at least one component, the threshold values being selected at least in part as a function of a cooling temperature to which the at least one component is cooled by a cooling facility associated therewith, and/or the limit temperature.

6. The method as claimed in claim 1 , wherein at least some of the temperature status categories are defined as a function of a mode of the magnetic resonance facility in a period ending at the beginning of the measuring protocol.

7. The method as claimed in claim 1 , wherein the temperature model is a linear temperature model in which, in a differential equation, a linear correlation is assumed between the temperature and its derivation over time over a time constant and an energy balance that considers a power input.

8. The method as claimed in claim 7 , wherein the time constant is greater than one minute, and the power input is assumed to be proportional to a mean gradient power.

9. The method as claimed in claim 8 , wherein the mean gradient power is a gradient strength mean squared.

10. A non-transitory computer-readable storage medium with an executable program stored thereon, that when executed, instructs a processor to perform the method of claim 1 .

11. A method for operating a magnetic resonance facility to acquire magnetic resonance data with a measuring protocol described by protocol parameters, the method comprising:
providing different setting parameter sets, wherein:
at least one model parameter of a temperature model is determined in a calibration measurement with the magnetic resonance facility, wherein a magnetic resonance sequence is used for the calibration measurement that incorporates a known mean gradient power,
temperature status categories of the magnetic resonance facility are determined based on corresponding usage categories of the magnetic resonance facility, each of the temperature status categories being different and including at least one different temperature status of at least one component of the magnetic resonance facility,
the different setting parameter sets are determined for each of the temperature status categories of the magnetic resonance facility using the temperature model describing a development of the different temperature statuses of the at least one component of the magnetic resonance facility, the at least one component being heated when the measuring protocol is run,
the different setting parameter sets include specified values for at least some of the protocol parameters and/or specified value ranges for at least some of the protocol parameters,
a current temperature status category is determined from the temperature status categories based on: a comparison of a current temperature status of at least one component and the different temperature statuses of the temperature status categories, and/or a usage category of the magnetic resonance facility,
a corresponding one of the different setting parameter sets is selected, based on the determined current temperature status category, to determine corresponding protocol parameters for the measuring protocol to prevent, during running of the measuring protocol and at a beginning of a measurement with the measuring protocol, overheating of the at least one component due to the measurement with the measuring protocol being repeated a maximum number of times for a specified number of repetitions, the overheating being defined by a limit temperature being exceeded,
the different setting parameter sets are determined such that the overheating is prevented for each starting temperature status included in a temperature status category of at least two temperature status categories;

determining protocol parameters for the measuring protocol based on the selected corresponding one of the different setting parameter sets; and
acquiring the magnetic resonance data using the determined protocol parameters.

12. The method as claimed in claim 11 , wherein the corresponding one of the different setting parameter sets is selected based on: an affiliation of a current temperature st

Assignees

• Siemens Healthcare Gmbh

Inventors

• Feiweier Thorsten
• Köhler Michael

Classifications

• G01R33/3856

  Means for cooling the gradient coils or thermal shielding of the gradient coils · CPC title

• G01R33/543 Primary

  Control of the operation of the MR system, e.g. setting of acquisition parameters prior to or during MR data acquisition, dynamic shimming, use of one or more scout images for scan plane prescription (G01R33/546 takes precedence) · CPC title

• G01R33/3804 Primary

  Additional hardware for cooling or heating of the magnet assembly, for housing a cooled or heated part of the magnet assembly or for temperature control of the magnet assembly · CPC title

• G01R33/3852

  Gradient amplifiers; means for controlling the application of a gradient magnetic field to the sample, e.g. a gradient signal synthesizer · CPC title

• G01R33/3614

  RF power amplifiers · CPC title