MOTION DETECTION AND CORRECTION METHOD FOR MAGNETIC RESONANCE DIFFUSION WEIGHTED IMAGING (DWI)

• US 20150316635A1
• Filed: 12/06/2013
• Published: 11/05/2015
• Est. Priority Date: 12/12/2012
• Status: Active Grant

• Current Assignee: Koninklijke Philips N.V.
• Original Assignee: Koninklijke Philips N.V.
• Inventors: STEHNING, CHRISTIAN, PERKINS, THOMAS, SENEGAS, JULIEN, KEUPP, JOCHEN
• Granted Patent: US 10,241,182 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01R 33/4831 using B1 gradients, e.g. rotating frame techniques, use of surface coils
• CPC Class Codes: G01R 33/56341 Diffusion imaging
• CPC Class Codes: G01R 33/56509 due to motion, displacement or flow, e.g. gradient moment nulling G01R33/567 takes precedence

Abstract

A magnetic resonance imaging system (1) includes at least one processor (28) configured to receive (48) diffusion weighted imaging data based on a diffusion weighted imaging sequence with magnetic gradient fields applied in different directions and with different b-values. The at least one processor (28) is further configured to detect (50) motion corrupted data present in the received imaging data based on a comparison of data redundant in the received data, and substitute (52) alternative data for detected motion corrupted data.

Claims

1. A magnetic resonance imaging system, comprising:

at least one processor configured to;

receive diffusion weighted imaging data based on a diffusion weighted imaging sequence with magnetic gradient fields applied in different directions and with different b-values;

detect motion corrupted data present in the received imaging data based on a comparison of data redundant in the received data; and

substitute alternative data for detected motion corrupted data.

2. The system according to claim 1, further comprising:

a repetitive motion monitoring unit which determines a time interval of expected repetitive motion of a subject; and

a gradient motion control unit which adjusts for acquisition of the diffusion weighted imaging data directional sensitivity of applied gradient fields to be sensitive orthogonal to a direction of the repetitive motion during the determined time interval.

3. The system according to claim 2, wherein the gradient motion control unit adjusts the directional sensitivity of the applied gradients fields to be sensitive in the direction of repetitive motion during an interval when no repetitive motion is expected.

4. The system according to claim 1, wherein the compared redundant data includes data from different directional gradients.

5. The system according to claim 1, wherein the compared redundant data includes data from exponential signal decay rates.

6. The system according to claim 5, wherein the compared redundant data includes data with similar b-values applied in different spatial directions.

7. The system according to claim 6, wherein the alternative data includes data based on different gradient directions.

8. The system according to claim 7, wherein the alternative data includes data based on different b-values.

9. The system according to claim 1, wherein the diffusion weighted imaging sequence is modified to resample locations of the motion corrupted data.

10. A method of magnetic resonance imaging, comprising:

receiving diffusion weighted imaging data based on a diffusion weighted imaging sequence with magnetic gradient fields applied in different directions and with different b-values;

detecting motion corrupted data present in the received imaging data based on a comparison of data redundant in the received data; and

substituting alternative data for detected motion corrupted data.

11. The method according to claim 10, further comprising:

determining an expected time interval of repetitive motion of a subject; and

adjusting acquisition of the diffusion weighted imaging data directional sensitivity of applied gradient fields to be sensitive orthogonal to a direction of the repetitive motion during the determined time interval.

12. The method according to claim 10, further comprising:

determining an expected time interval of repetitive motion of a subject; and

adjusting the directional sensitivity of the applied gradients fields to be sensitive in the direction of repetitive motion during an interval when no repetitive motion is expected.

13. The method according to claim 10, wherein the compared redundant data includes data from at least one of:

different directional gradients;

exponential signal decay rates;

or

similar b-values applied in different spatial directions.

14. The method according to claim 10, the alternative data includes data based on different gradient directions.

15. The method according to claim 10, the alternative data includes data based on different b-values.

16. The method according to claim 10, further including:

modifying the diffusion weighted imaging sequence to resample locations of the motion corrupted data.

17. A non-transitory computer-readable storage medium carrying software which controls one or more electronic data processing devices to perform the method according to claim 16.

18. An electronic data processing device configured to perform the method according to claim 16.

19. A magnetic resonance system, comprising:

a processor which receives diffusion weighted imaging data based on a diffusion weighted imaging sequence with magnetic gradient fields applied in different directions and with different b-values,

a repetitive motion monitoring unit which determines an expected time interval of repetitive motion of a subject; and

a gradient motion control unit which adjusts for acquisition of the diffusion weighted imaging data of the subject with a directional sensitivity of the applied magnetic gradient fields along three axes to be sensitive orthogonal to a direction of repetitive motion during the determined time interval.

20. The system according to claim 19, wherein the repetitive motion monitoring unit includes at least one of:

a respiratory monitor operatively connected to the subject which determines time intervals of respiratory motion;

or

an electrocardiogram monitor operatively connected to the subject which determines time intervals of cardiac motion.