DEVICE, METHOD AND SYSTEM FOR CONTROLLING IMAGING METHODS AND SYSTEMS

• US 20140292332A1
• Filed: 03/28/2014
• Published: 10/02/2014
• Est. Priority Date: 03/28/2013
• Status: Active Grant

• Current Assignee: Siemens Healthineers AG (Siemens AG)
• Original Assignee: Siemens AG
• Inventors: Fautz, Hans-Peter, Fontius, Joerg Ulrich, Gumbrecht, Rene, Adolf, Holger, Benner, Thomas
• Granted Patent: US 9,671,475 B2
• Time in Patent Office: Days
• US Class Current: 324/309
• CPC Class Codes: 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
• CPC Class Codes: 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

Abstract

In a computer-implemented method, device and system for controlling an imaging system, a specific absorption rate is calculated with a computation unit and an RF transmission signal of the imaging system is controlled with a control device. The process of controlling of the RF transmission signal includes disconnecting the RF transmission signal when a remaining period during which the RF transmission signal is harmless for the patient has been reduced to zero.

Claims

1. A computer-implemented method for controlling an imaging system;

from an RF radiator in an imaging system, radiating RF energy corresponding to an Rf transmission signal supplied to said RF radiator from a control computer;

in said control computer, calculating a specific absorption rate for a patient exposed to said RF energy radiated in said imaging system;

in control said computer determining, from said specific absorption rate, a length of time during which radiation of said RF energy in said imaging system does not harm the examination subject; and

in said control computer, monitoring said duration during radiation of said RF energy in said imaging system and automatically disconnecting said RF transmission signal when said duration has been reduced to zero.

2. A method as claimed in claim 1 comprising calculating said specific absorption rate by calculating a partial result for said specific absorption rate, and increasing said length of time dependent on said partial result.

3. A method as claimed in claim 1 comprising reducing said length of time dependent on said RF transmission signal.

4. A method as claimed in claim 1 comprising calculating said specific absorption rate under non-real time requirements.

5. A method as claimed in claim 1 comprising controlling said radiation of said RF energy under real-time requirements.

6. A method as claimed in claim 1 wherein said computer is also configured to reconstruct an image of the examination subject from image data acquired by said imaging system.

7. A computerized device for controlling an imaging system;

a control computer configured to generate an RF signal for operating an RF radiator in an imaging system, and to supply said RF transmission signal supplied to said RF radiator to cause said RF radiator to radiate RF energy corresponding to said RF transmission signal;

a computerized calculation unit configured to calculate a specific absorption rate for a patient exposed to said Rf energy radiated in said imaging system;

said control computer being configured to determine, from said specific absorption rate, a length of time during which radiation of said RF energy in said imaging system does not harm the examination subject; and

said control computer being configured to monitor said duration during radiation of said RF energy in said imaging system and to automatically disconnect said RF transmission signal when said duration has been reduced to zero.

8. A device as claimed in claim 7 comprising wherein said calculation unit is configured to calculate said specific absorption rate by calculating a partial result for said specific absorption rate, and wherein said control computer is configured to increase said length of time dependent on said partial result.

9. A device as claimed in claim 7 wherein said control computer is configured to also reduce said length of time dependent on said RF transmission signal.

10. A device as claimed in claim 7 wherein said calculation unit is configured to calculate said specific absorption rate under non-real time requirements.

11. A device as claimed in claim 7 wherein said control computer is configured to control said radiation of said RF energy by said RF radiator under real-time requirements.

12. A device as claimed in claim 7 wherein said control computer is also configured to reconstruct an image of the examination subject from image data acquired by said imaging system.

13. An imaging system comprising:

an RF radiator that radiates RF energy into an examination subject dependent on an RF transmission signal supplied to said RF radiator;

a control computer configured to generate an RF transmission signal for operating said RF radiator, and to supply said RF transmission signal supplied to said RF radiator to cause said RF radiator to radiate RF energy corresponding to said RF transmission signal;

a computerized calculation unit configured to calculate a specific absorption rate for a patient exposed to said Rf energy radiated in said imaging system;

said control computer being configured to determine, from said specific absorption rate, a length of time during which radiation of said RF energy in said imaging system does not harm the examination subject; and

said control computer being configured to monitor said duration during radiation of said RF energy in said imaging system and to automatically disconnect said RF transmission signal when said duration has been reduced to zero.

14. A non-transitory, computer-readable data storage medium encoded with programming instructions, said storage medium being loaded into a computer of an imaging system, said imaging system comprising an RF radiator that radiates RF energy into an examination subject, said programming instructions causing said computer to:

generate an RF transmission signal for operating said RF radiator, and supply said RF transmission signal to said RF radiator to cause said RF radiator to radiate RF energy corresponding to said RF transmission signal;

calculate a specific absorption rate for a patient exposed to said Rf energy radiated in said imaging system;

determine, from said specific absorption rate, a length of time during which radiation of said RF energy in said imaging system does not harm the examination subject; and

monitor said duration during radiation of said RF energy in said imaging system and automatically disconnect said RF transmission signal when said duration has been reduced to zero.