Short TE 3D radial sampling sequence for MRI

Patent metadata

Field	Value
Publication number	US-9341691-B2
Application number	US-200913128830-A
Country	US
Kind code	B2
Filing date	Nov 11, 2009
Priority date	Nov 12, 2008
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

A method for magnetic resonance imaging includes providing a radio frequency excitation pulse to a specimen. The pulse has a duration. The method includes, concurrent with providing the radio frequency excitation pulse, applying a first gradient having a first polarity. The method includes applying a readout gradient at a time after the duration. The readout gradient has inverse polarity relative to the first polarity. The method includes, concurrent with applying the readout gradient, acquiring magnetic resonance data from the specimen. The method includes generating an image based on the magnetic resonance data.

First claim

The claimed invention is:

1. A magnetic resonance imaging system comprising:
a magnet operable to provide a magnetic field;
a transmitter operable to transmit to a region within the magnetic field;
a receiver operable to receive a magnetic resonance signal from the region; and
a processor coupled to the transmitter and coupled to the receiver, the processor operable to cause the transmitter to provide, to the region, a radio frequency excitation pulse, a first gradient, and a readout gradient and operable to cause the receiver to generate magnetic resonance data based on the magnetic resonance signal, the processor configured to provide the radio frequency excitation pulse concurrent with the first gradient, the radio frequency excitation pulse having a duration and the first gradient having a first polarity, and after the duration, operable to provide the readout gradient, the readout gradient having an inverse polarity rely to the first polarity, and receive the magnetic resonance signal while providing the readout gradient, and the processor operable to generate an image based on the magnetic resonance data and wherein the image corresponds to a 3D radial image based on k-space data and wherein the first gradient corresponds to a spoke in the k-space data.

2. The magnetic resonance imaging system of claim 1 , wherein the processor is operable to provide a time delay between the duration and the readout gradient.

3. The magnetic resonance imaging system of claim 1 , wherein the radio frequency excitation pulse includes a frequency modulated pulse.

4. A method of operating a magnetic resonance scanner, the method comprising:
providing a radio frequency excitation pulse to a specimen, the radio frequency excitation pulse having a duration;
concurrent with providing the radio frequency excitation pulse, applying a first gradient having a first polarity, wherein applying the first gradient includes selecting a spoke in k-space data, the k-space data corresponding to a radial image;
applying a readout gradient at a time after the duration, the readout gradient having inverse polarity relative to the first polarity;
acquiring magnetic resonance data from the specimen while applying the readout gradient; and
generating an image based on the magnetic resonance data.

5. The method of claim 4 , wherein a magnitude of the readout gradient is substantially equal to a magnitude of the first gradient.

6. The method of claim 4 , further including waiting a delay period after the duration and before applying the readout gradient.

7. The method of claim 4 , wherein providing the radio frequency excitation pulse includes applying a frequency modulated pulse.

8. The method of claim 4 , wherein providing the radio frequency excitation pulse includes applying at least one of a hyperbolic secant pulse or a sinc pulse.

9. The method of claim 4 , wherein generating the image includes gridding.

10. The method of claim 4 , wherein generating the image includes executing a Fourier transform.

Assignees

• Park Jang-Yeon
• Moeller Steen
• Chamberlain Ryan
• Garwood Michael G
• Univ Minnesota

Inventors

• Park Jang-Yeon
• Moeller Steen
• Chamberlain Ryan
• Garwood Michael G

Classifications

• G01R33/4641

  Sequences for NMR spectroscopy of samples with ultrashort relaxation times such as solid samples · CPC title

• G01R33/4816 Primary

  NMR imaging of samples with ultrashort relaxation times such as solid samples, e.g. MRI using ultrashort TE [UTE], single point imaging, constant time imaging · CPC title