System and method for multislice fast magnetic resonance imaging
First Claim
1. A method of multislice fast magnetic resonance imaging comprising:
- exciting, by a magnetic resonance imaging signal generator, at least two slices offset from one another;
repeating said exciting of said at least two slices at least once with phase-encoding gradient signals, wherein the phase of said phase-encoding gradient signals being modified at each repeating, wherein respective signals are received for each slice excitation, creating a first image data set for each respective slice;
transforming the respective first image data sets for each said slice into separate image data sets;
replacing, for each said slice, at least one of said separate image data sets with null values;
inverse transforming the respective first data image sets and separate image sets for each said slice; and
combining, for each slice, the respective inverse transformed data sets,thereby creating respective images representing said slices.
2 Assignments
0 Petitions
Accused Products
Abstract
Through advancing the phase of radio frequency (RF) excitation with each phase-encoding level, a method, apparatus and article thereof increases the effectiveness of a Magnetic Resonance Imaging (MRI) device by correcting for main magnetic field inhomogeneities without noticeably decreasing the signal-to-noise (SNR) ratio. Increased effectiveness of fast imaging with steady precession (FISP) scans and using FISP scans to image multiple slices. In an MRI device, a patient is subjected to a constant magnetic field, and RF pulses are used to excite the nuclei in the patient'"'"'s body, which release a corresponding RF signal as the nuclei relax, which is measured and mapped into a visual display. The RF pulses used to excite the nuclei cooperate with a slice select gradient and a phase-encoding gradient. When the RF pulse is phase shifted with each phase-encoding gradient level, improved SNR ratios are observed.
19 Citations
24 Claims
-
1. A method of multislice fast magnetic resonance imaging comprising:
-
exciting, by a magnetic resonance imaging signal generator, at least two slices offset from one another; repeating said exciting of said at least two slices at least once with phase-encoding gradient signals, wherein the phase of said phase-encoding gradient signals being modified at each repeating, wherein respective signals are received for each slice excitation, creating a first image data set for each respective slice; transforming the respective first image data sets for each said slice into separate image data sets; replacing, for each said slice, at least one of said separate image data sets with null values; inverse transforming the respective first data image sets and separate image sets for each said slice; and combining, for each slice, the respective inverse transformed data sets, thereby creating respective images representing said slices. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A magnetic resonance imaging device comprising:
-
a signal generator, said signal generator generating a plurality of magnetic resonance imaging phase encoding gradient signals, exciting at least two slices offset from one another, wherein the phase of said phase-encoding gradient signals are offset from one another, wherein respective signals are received for each slice excitation, creating a first image data set for each respective slice; a processor, said processor for each respective imaging slice in each said first image data set transforming the respective first image data sets for each slice into separate image data sets, and nulling out at least one of said separate image data sets with null values; said processor inverse transforming the respective first data image sets and separate image sets for each said slice; and
combining, for each slice, the respective inverse transformed data sets,thereby creating respective images representing said slices. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
-
Specification