Through-plane navigator

Patent metadata

Field	Value
Publication number	US-9846217-B2
Application number	US-201314386098-A
Country	US
Kind code	B2
Filing date	Mar 21, 2013
Priority date	Mar 26, 2012
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

A magnetic resonance scanner ( 10 ) includes a main magnet ( 12 ), gradient coils ( 14 ) and a gradient coil controller ( 28 ), one or more RF coils ( 16,50 ), an RF transmitter ( 30 ), an RF receiver ( 34 ), and one or more processors ( 38 ). The main magnet ( 12 ) generates a B 0 field. The gradient coils ( 14 ) and a gradient coil controller ( 28 ) generate gradients across the Bo field. The one or more RF coils ( 16,50 ) transmit B 1 pulses and receive magnetic resonance signals. The RF transmitter ( 30 ) transmits B 1 pulses to the RF coils to excite and manipulate resonance. The RF receiver ( 34 ) demodulates received resonance signals into data lines. The one or more processors ( 38 ) are connected to the gradient coil controller ( 28 ), the RF transmitter ( 30 ), and the RF receiver ( 34 ) and are programmed to control ( 70 ) the RF transmitter and the gradient coil controller to implement an interleaved multi-slice 2D imaging sequence which in each of a plurality of TRs generates a first and second navigation data lines and at least one image data line for each of a plurality of slices. The one or more processors are further programmed to reconstruct ( 74 ) the first navigation data lines from the plurality of slices into a first navigation projection image, reconstruct ( 74 ) the second navigation data lines from the plurality of slices into a second navigation image; and compare ( 76 ) successive navigation projection images to detect and adjust ( 78 ) for 3D motion.

First claim

What is claimed is:

1. A magnetic resonance scanner, comprising:
main magnet coils, which generate a B 0 field;
gradient windings and a gradient coil controller, which generates gradients across the B 0 field;
one or more RF coils, or one of more local RF coils, which transmit B 1 pulses and receive magnetic resonance signals;
an RF transmitter, which transmits B 1 pulses to the RF coils to excite and manipulate resonance;
an RF receiver, which demodulates received resonance signals into imaging data lines;
a sequence controller connected to the gradient controller, and the RF transmitter, the sequence controller being configured to:
control the RF transmitter and the gradient coil controller to implement an interleaved multi-slice 2D imaging sequence, which in each of a plurality of repetitions (TRs) generates a first and second navigation data lines and at least one image data line for each of a plurality of slices; and

one or more processors configured to:
reconstruct the first navigation data lines from the plurality of slices into a first navigation projection image;
reconstruct the second navigation data lines from the plurality of slices into a second navigation projection image; and
compare successive navigation projection images to detect and adjust for 3D motion; and

a display device, which displays reconstructed 2D slices.

2. The magnetic resonance scanner according to claim 1 , wherein the first and second navigation projection images are orthogonal to each other.

3. The magnetic resonance scanner according to claim 1 , wherein the first and second navigation data lines are read out in orthogonal directions.

4. The magnetic resonance scanner according to claim 1 , wherein the first and second navigation data lines, and the imaging data lines are acquired radially.

5. The magnetic resonance scanner according to claim 1 , wherein the one or more processors are further programmed to:
control the gradient controller and/or the RF transmitter to move an imaging coordinate system in accordance with the detected motion.

6. The magnetic resonance scanner according to claim 1 , wherein the first and second navigation data lines acquired include zero phase encoding.

7. The magnetic resonance scanner according to claim 1 , wherein the one or more processors are further programmed to:
adjust the imaging data lines for each slice to compensate for detection motion; and
reconstruct the adjusted data lines for each slice into a corresponding motion corrected slice image.

8. The magnetic resonance scanner according to claim 1 , wherein the one or more processors are further configured to:
reorient k-space for subsequent data acquisition using the detected motion, or
reorient the imaging coordinate system of gradient pulses to maintain an imaging system of the magnetic resonance scanner substantially constant relative to a coordinate system of an imaged region.

9. A method of magnetic resonance imaging, the method comprising:
implementing an interleaved multi-slice 2D imaging sequence in which each of a plurality of repetitions (TRs) generates a first navigation data line, a second navigation data line, and at least one imaging data line for each of a plurality of slices;
after each of the plurality of repetitions (TRs) reconstructing the first data lines from the plurality of slices into a first navigation projection image;
after each of the plurality of repetitions (TRs) reconstructing the first data lines from the plurality of slices into a second navigation projection image;
comparing successive navigation projection images to detect 3D motion, and based on the comparing, adjusting for 3D motion; and
displaying reconstructed 2D slices on a display device.

10. The method of magnetic resonance imaging according to claim 9 , wherein the first and second navigation projection images are orthogonal to each other.

11. The method of magnetic resonance imaging according to claim 10 , wherein the first and second navigation data lines are read out in orthogonal directions.

12. The method of magnetic resonance imaging according to claim 9 , wherein the first and second navigation data lines, and the imaging data lines are acquired radially.

13. The method of magnetic resonance imaging according to claim 9 , further including:
adjusting the imaging data lines for each slice to compensate for detection motion; and
reconstructing the adjusted imaging data lines for each slice into a corresponding motion corrected slice image.

14. The method of magnetic resonance imaging according to claim 9 , further including:
controlling a gradient controller and/or an RF transmitter to move an imaging coordinate system in accordance with the detected motion.

15. The method of magnetic resonance imaging according to claim 14 , wherein the adjusting further comprises:
reorienting k-space for subsequent data acquisition using the detected motion, or reorienting the imaging coordinate system to maintain an imaging system of a magnetic resonance scanner substantially constant relative to a coordinate system of an imaged region.

16. The method of magnetic resonance imaging according to claim 9 , wherein the first and second navigation data lines acquired include zero phase encoding.

17. A non-transitory computer-readable medium carrying software for controlling one or more processors to perform the method according to claim 9 .

18. An MR system comprising:
one or more processors programmed to perform the method according to claim 9 ; and
a scanning system controlled by the one or more processors to implement an interleaved multi-slice 2D imaging system.

19. A magnetic resonance scanner, comprising:
one or more processors programmed to:
acquire data from each echo train in an interleaved 2D multi-slice imaging sequence in each of a plurality of repetitions (TRs), the imaging sequence generates navigation data lines orthogonal to each other and imaging data lines that are parallel to each other in each of a plurality of slices;
reconstruct the navigation data lines from each of the plurality of slices into orthogonal navigation projection images after each of the plurality of repetitions (TR);

compare successive reconstructed navigation images from each repeat time to detect motion;
compare successive navigation images to detect motion; and
reorient k-space for subsequent data acquisition using the detected motion, or reorient an imaging coordinate system of gradient pulses to maintain an imaging system of the magnetic resonance scanner substantially constant relative to a coordinate system of an imaged region.

20. The magnetic resonance scanner according to claim 19 , wherein the one or more processors are further programmed to:
reconstruct the imaging data lines into a diagnostic image.

21. The magnetic resonance scanner according to claim 19 , wherein the navigation data lines, and the imaging data lines are acquired radially.

22. The magnetic resonance scanner according to claim 19 , wherein the one or more processors are further programmed to:
control a gradient controller and/or an RF transmitter to move an imaging coordinate system in accordance with the detected motion.

23. The magnetic resonance scanner according to claim 19 , wherein the navigation data lines acquired include zero phase encoding.

24. The magnetic resonance scanner according to claim 19 , wherein the one or more processors are furth

Assignees

• Koninklijke Philips Nv

Inventors

• Lin Wei

Classifications

• G01R33/5608

  Data processing and visualization specially adapted for MR, e.g. for feature analysis and pattern recognition on the basis of measured MR data, segmentation of measured MR data, edge contour detection on the basis of measured MR data, for enhancing measured MR data in terms of signal-to-noise ratio by means of noise filtering or apodization, for enhancing measured MR data in terms of resolution by means for deblurring, windowing, zero filling, or generation of gray-scaled images, colour-coded images or images displaying vectors instead of pixels (image data processing or generation, in general G06T) · CPC title

• G01R33/385

  using gradient magnetic field coils · CPC title

• A61B5/055

  involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging · CPC title

• G01R33/4835

  of multiple slices · CPC title

• G01R33/5673 Primary

  Gating or triggering based on a physiological signal other than an MR signal, e.g. ECG gating or motion monitoring using optical systems for monitoring the motion of a fiducial marker · CPC title