WHOLE BODY MRI SCANNING WITH MOVING TABLE AND INTERACTIVE CONTROL

• US 20050171423A1
• Filed: 04/19/2005
• Published: 08/04/2005
• Est. Priority Date: 05/16/2002
• Status: Active Grant

• Current Assignee: General Electric Company, Uniformed Services University of the Health Sciences (Government of the United States of America)
• Original Assignee: General Electric Company
• Inventors: Ho, Vincent B., Foo, Thomas K. F.
• Granted Patent: US 7,738,944 B2
• Time in Patent Office: Days
• US Class Current: 600/410
• CPC Class Codes: A61B 5/055 involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
• CPC Class Codes: A61B 5/704 Tables
• CPC Class Codes: G01R 33/56375 Intentional motion of the sample during MR, e.g. moving table imaging

Abstract

The present invention includes a method and apparatus for high sensitivity whole body scanning using MR imaging. The invention includes acquiring MR data as the patient moves through the iso-center of the magnet while providing interactive control for the operator to change scan parameters and table motion and direction. The technique allows efficient whole body scanning for fast screening of abnormalities while allowing operator control during the screening process to interrupt table motion and redirect the speed and direction of the table while also allowing control over the acquisition plane, number of sections imaged, inter-section spacing, and the scan location.

Claims

1. A method of MR image acquisition comprising:

positioning a subject on a movable table;

entering initial table motion control data and scan parameters;

automatically moving the movable table based on the table motion control data entered;

acquiring MR data based on the scan parameters entered while the movable table is in motion; and

allowing modification of the initial table motion control data and the scan parameters while automatically moving the table and acquiring MR data.

2. The method of claim 1 further comprising providing interactive control of table motion and scan parameters that include control over and adjustment of at least one of:

speed of the movable table, direction of table motion, and pulse sequence for MR data acquisition.

3. The method of claim 1 wherein the step of acquiring MR data includes ability to continuously scan while the movable table is in translation using a multi-planar fast imaging pulse sequence.

4. The method of claim 3 further comprising the step of initially selecting a desired plane for MR data acquisition through an anatomic region of interest, and as the subject traverses through a magnet iso-center, allowing operator adjustment of at least one of a number of sections imaged, section spacing, section scan locations, and imaging plane.

5. The method of claim 1 further comprising providing an ability to interrupt scanning after identifying an abnormality of interest, reversing the movable table and acquiring high spatial resolution image data.

6. The method of claim 5 wherein the abnormality of interest is a tumor and further comprises the steps of acquiring functional images and characterizing the tumor using one of contrast media uptake, diffusion, and multi-parametric imaging.

7. The method of claim 1 further comprising tailoring acquisition plane and spatial coverage to each anatomical region desired during MR image acquisition in real-time.

8. The method of claim 1 further comprising allowing continuous variation of imaging parameters including transmitter/receive gains and localized shimming.

9. The method of claim 1 further comprising obtaining multiple images of a same anatomical region to decrease false positive possibilities.

10. An MRI apparatus with sensitive whole body screening ability comprising:

a magnetic resonance imaging (MRI) system having a plurality of gradient coils positioned about a bore of a magnet to impress a polarizing magnetic field and an RF transceiver system and an RF switch controlled by a pulse module to transmit RF signals to an RF coil assembly to acquire MR images;

a table movable under computer control within the bore of the magnet;

a computer programmed to;

receive scan parameters and table translation parameters;

translate the table according to the table translation parameters;

acquire MR data according to the scan parameters while the table translates;

allow reception of user changes to the table translation parameters of scan parameters during table translation and if so received, modify translation in response thereto; and

allow reception of user changes to the scan parameters during data acquisition and if so received, modify MR data acquisition in response thereto.

11. The MRI apparatus of claim 10 wherein MR data is acquired continuously during table translation.

12. The MRI apparatus of claim 10 wherein table translation is approximately 0.5 cm/sec. and scan times are approximately one second to thereby reduce motion artifacts.

13. The MRI apparatus of claim 10 wherein the computer is further programmed to allow user-selectable fat suppression and when selected, apply an intermittent fat suppression RF pulse.

14. The MRI apparatus of claim 10 wherein the computer is further programmed to monitor flow of an intravenous contrast agent.

15. The MRI apparatus of claim 10 wherein the computer is further programmed to acquire data of a region of abnormality in multiple planes in real-time.

16. The MRI apparatus of claim 10 wherein the computer is further programmed to allow manipulation of at least one of image obliquity, table speed, table direction, and pulse sequence parameters such as inversion time, flip angle, and sequence type in real-time.

17. The MRI apparatus of claim 10 wherein the computer is further programmed to acquire functional images and allow characterization of lesions in real-time.

18. The MRI apparatus of claim 10 wherein the computer is further programmed to vary transmitter gain, receiver gain, and shimming on demand by a user.

19. A method of identifying a tumor in a patient comprising:

placing a patient on a movable table;

translating the movable table and acquiring MR data as the patient moves through a magnetic field;

reconstructing and displaying MR images of patient anatomy as the movable table is translating;

analyzing the MR images and if an area of interest is identified for further study, returning the movable table such that the area of interest is within the magnetic field and modifying MR data acquisition and table translation parameters in real-time; and

acquiring one of higher resolution MR data and differing plane MR data to allow further analysis of the area of interest.

20. The method of claim 19 further comprising allowing manipulation of at least one of image obliquity, table speed, table direction, inversion time, flip angle, transmitter gain, receiver gain, and shimming during at least one of table translation and MR data acquisition.