Dynamic 3d mri data sampling

Patent metadata

Field	Value
Publication number	US-2016274201-A1
Application number	US-201615075716-A
Country	US
Kind code	A1
Filing date	Mar 21, 2016
Priority date	Mar 20, 2015
Publication date	Sep 22, 2016
Grant date	—

Abstract

A magnetic resonance imaging system may include: a magnet; gradient coils; an RF pulse transmitter; an RF receiver that receives MR signals from tissue that has been exposed to RF pulses from the RF pulse generator, gradient fields from the gradient coils, and a magnetic field from the magnet; a system controller that controls the magnet, gradient coils, RF pulse transmitter, and RF receiver so as to generate data representative of at least a portion of the composition of an object, including controlling the gradient coils and RF receiver so as to cause MRI data to be acquired that includes information about at least one attribute of the object at different points in time and that represents an incomplete sample of a portion of k-space that is a Fourier transform of the object; and a data processing system that generates one or more images of at least a portion of the object based on the MRI data.

First claim

1 . A magnetic resonance imaging system comprising:
a magnet; gradient coils; an RF pulse transmitter; an RF receiver that receives MR signals from tissue that has been exposed to RF pulses from the RF pulse generator, gradient fields from the gradient coils, and a magnetic field from the magnet; a system controller that controls the magnet, gradient coils, RF pulse transmitter, and RF receiver so as to generate data representative of at least a portion of the composition of an object, including controlling the gradient coils and RF receiver so as to cause MRI data to be acquired that includes information about at least one attribute of the object at different points in time and that represents an incomplete sample of a portion of k-space that is a Fourier transform of the object; and a data processing system that generates one or more images of at least a portion of the object based on the MRI data.

2 . The magnetic resonance imaging system of claim 1 wherein the system controller causes an acquisition of k-space that is processed by the data processing system and, when so processed, produces incoherent artifacts in the one or more images.

3 . The magnetic resonance imaging system of claim 2 wherein the incoherent artifacts are produced when a portion of the object is moving or changing.

4 . The magnetic resonance imaging system of claim 2 wherein the data processing system chooses a temporal or spatial resolution of the one or more images during or after the k-space data is acquired.

5 . The magnetic resonance imaging system of claim 2 wherein the system controller causes the k-space to be acquired along radial spokes.

6 . The magnetic resonance imaging system of claim 5 wherein the system controller causes k-space to be acquired on a Cartesian grid.

7 . The magnetic resonance imaging system of claim 5 wherein the system controller causes the k-space to be acquired at only a portion of the locations along each radial spoke.

8 . The magnetic resonance imaging system of claim 7 wherein the k-space has a center and periphery and the system controller causes the k-space to be acquired at locations near the k-space center more frequently than locations near the k-space periphery.

9 . The magnetic resonance imaging system of claim 7 wherein the system controller causes the k-space to be acquired from the k-space periphery to the k-space center.

10 . The magnetic resonance imaging system of claim 5 wherein the system controller causes the k-space to be acquired at locations identified by a random or pseudorandom number generator.

11 . A non-transitory, tangible, computer-readable storage media containing a program of instructions that, when loaded in an MRI system of the type recited in claim 1 , cause the system controller and data processing system of the MRI system to perform the functions that are recited in claim 1 .

12 . The storage media of claim 11 wherein the program of instructions cause the system controller to perform the functions that are recited in claim 2 .

13 . The storage media of claim 11 wherein the incoherent artifacts are produced when recited in claim 3 .

14 . The storage media of claim 11 wherein the program of instructions cause the data processing system to perform the functions that are recited in claim 4 .

15 . The storage media of claim 11 wherein the program of instructions cause the system controller to perform the functions that are recited in claim 5 .

16 . The storage media of claim 11 wherein the program of instructions cause the system controller to perform the functions that are recited in claim 6 .

17 . The storage media of claim 11 wherein the program of instructions cause the system controller to perform the functions that are recited in claim 7 .

18 . The storage media of claim 11 wherein the program of instructions cause the system controller to perform the functions that are recited in claim 8 .

19 . The storage media of claim 11 wherein the program of instructions cause the system controller to perform the functions that are recited in claim 9 .

20 . The storage media of claim 11 wherein the program of instructions cause the system controller to perform the functions that are recited in claim 10 .

Assignees

• Univ Southern California

Inventors

• Zhu Yinghua
• Guo Yi
• Nayak Krishna S
• Lebel Robert Marc

Classifications

• G01R33/56325

  Cine imaging · CPC title

• G01R33/5635 Primary

  Angiography, e.g. contrast-enhanced angiography [CE-MRA] or time-of-flight angiography [TOF-MRA] · CPC title

• G01R33/4826

  in three dimensions · CPC title

• G01R33/482

  using a Cartesian trajectory · CPC title

• G01R33/34046

  Volume type coils, e.g. bird-cage coils; Quadrature bird-cage coils; Circularly polarised coils · CPC title