# US 2024/0201289 A1 · Method for operating an mri system, an mri system, a control unit, a storage unit, a computer program, and an electronically readable data carrier

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- Number: US 2024/0201289 A1
- Document ID: US20240201289A1
- Status: Published application
- Kind: A1
- Application number: 18/519,631
- Filed: 2023-11-27
- Published: 2024-06-20
- Earliest claimed: 2022-12-15
- Assignees: Siemens Healthineers AG
- Applicants: Siemens Healthcare GmbH
- Inventors: Volker Schnetter
- Web page: https://patentgrep.com/patent/US20240201289A1

## CPC

- G01R 33/288: {Provisions within MR facilities for enhancing safety during MR, e.g. reduction of the specific absorption rate [SAR], detection of ferromagnetic objects in the scanner room}
- G01R 33/543: {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)}
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

A method performed by an MRI system includes: receiving at least one object parameter value of an object to be examined in accordance with a predefined MRI protocol; determining a frequency distribution of deposition values of examined objects, each having the at least one object parameter value, from available MRI examination datasets; determining, by a control unit of the MRI system, a reference deposition value of the examined objects, each having the at least one object parameter value, from the frequency distribution of the deposition values of the examined objects, each having the at least one object parameter value, for a predefined reference proportion in accordance with a predefined reference determining procedure; and determining, as a function of the reference deposition value, at least one MRI protocol parameter of the predefined MRI protocol for examining the object to be examined, in accordance with a predefined MRI protocol optimization procedure.

## Claims

### Claim 1

A method comprising:
receiving, by a control unit of a magnetic resonance imaging (MRI) system, at least one object parameter value of an object in an MRI examination in accordance with a predefined MRI protocol;
determining, by the control unit, a frequency distribution of deposition values of examined objects from available MRI examination datasets, each having the at least one object parameter value, wherein a respective MRI examination dataset of the MRI examination datasets comprises a respective deposition value and a respective object parameter value of a respective examined object;
determining, by the control unit, a reference deposition value of the examined objects from the frequency distribution of the deposition values of the examined objects for a predefined reference proportion in accordance with a predefined reference determining procedure of the MRI system; and
determining, by the control unit, at least one MRI protocol parameter of the predefined MRI protocol for examining the object having the object parameter value in accordance with a predefined MRI protocol optimization procedure as a function of the reference deposition value.

### Claim 2 (depends on 1)

The method of claim 1, wherein the predefined reference determining procedure of the MRI system comprises:
determining, by the control unit from the frequency distribution, a distribution function of the deposition values of the examined objects having the at least one object parameter value;
determining, by the control unit, an inverse distribution function of the distribution function, wherein the inverse distribution function assigns a largest deposition value to a proportion of the examined objects that have the at least one object parameter value at which the distribution function of the deposition values exceeds the proportion;
determining, by the control unit, a largest deposition value for the predefined reference proportion by the inverse distribution function; and
determining, by the control unit, the largest deposition value for the predefined reference proportion as the reference deposition value.

### Claim 3 (depends on 1)

The method of claim 1, wherein the deposition values of the examined objects describe specific absorption rate (SAR) values.

### Claim 4 (depends on 1)

The method of claim 1, wherein the deposition values of the examined objects describe B1+∧2 values.

### Claim 5 (depends on 1)

The method of claim 1, wherein the at least one object parameter value comprises a mass of the object.

### Claim 6 (depends on 1)

The method of claim 1, wherein the at least one object parameter value comprises a position of an examination region of the object.

### Claim 7 (depends on 1)

The method of claim 1, further comprising:
receiving, by the control unit, the predefined reference proportion.

### Claim 8 (depends on 7)

The method of claim 7, further comprising:
retrieving, by the control unit, the deposition values of the examined objects having the at least one object parameter value from a storage unit of the MRI system.

### Claim 9 (depends on 8)

The method of claim 8, further comprising:
activating, by the control unit, an MRI apparatus to examine the object by the MRI apparatus in accordance with the MRI protocol.

### Claim 10 (depends on 9)

The method of claim 9, further comprising:
determining, by the control unit, the respective deposition value of the object;
creating, by the control unit, the respective MRI examination dataset comprising the respective deposition value and the respective object parameter value of the object; and
transmitting, by the control unit, the respective MRI examination dataset to the storage unit.

### Claim 11 (depends on 1)

The method of claim 1, further comprising:
retrieving, by the control unit, the deposition values of the examined objects having the at least one object parameter value from a storage unit of the MRI system.

### Claim 12 (depends on 1)

The method of claim 1, further comprising:
activating, by the control unit, an MRI apparatus to examine the object by the MRI apparatus in accordance with the MRI protocol.

### Claim 13 (depends on 12)

The method of claim 12, further comprising:
determining, by the control unit, the respective deposition value of the object;
creating, by the control unit, the respective MRI examination dataset comprising the respective deposition value and the respective object parameter value of the object; and
transmitting, by the control unit, the respective MRI examination dataset to a storage unit.

### Claim 14

A magnetic resonance imaging (MRI) system comprising:
at least one control unit configured to:
receive at least one object parameter value of an object in an MRI examination in accordance with a predefined MRI protocol;
determine a frequency distribution of deposition values of examined objects from available MRI examination datasets, each having the at least one object parameter value, wherein a respective MRI examination dataset of the MRI examination datasets comprises a respective deposition value and a respective object parameter value of a respective examined object;
determine a reference deposition value of the examined objects from the frequency distribution of the deposition values of the examined objects for a predefined reference proportion in accordance with a predefined reference determining procedure; and
determine, as a function of the reference deposition value, at least one MRI protocol parameter of the predefined MRI protocol for examining the object having the object parameter value in accordance with a predefined MRI protocol optimization procedure.

### Claim 15

A control unit of a magnetic resonance imaging (MRI) system, wherein the control unit is configured to:
receive at least one object parameter value of an object in an MRI examination in accordance with a predefined MRI protocol;
determine a frequency distribution of deposition values of examined objects from available MRI examination datasets, each having the at least one object parameter value, wherein a respective MRI examination dataset of the MRI examination datasets comprises a respective deposition value and a respective object parameter value of a respective examined object;
determine a reference deposition value of the examined objects from the frequency distribution of the deposition values of the examined objects for a predefined reference proportion in accordance with a predefined reference determining procedure; and
determine, as a function of the reference deposition value, at least one MRI protocol parameter of the predefined MRI protocol for examining the object having the object parameter value in accordance with a predefined MRI protocol optimization procedure.