Reduction of blurring in view angle tilting MRI
AssigneeThe Board of Trustees of the Leland Stanford Junior University
InventorsKim Butts, John M. Pauly
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Abstract
Magnetic resonance imaging utilizes view angle tilting to correct for in-plane distortions with each RF excitation pulse being followed by a plurality of signal readouts to reduce image blurring. Each image readout is in the presence of a frequency select gradient (GX) and a slice select gradient (GZ), and at least the slice select gradient is refocused after each readout of an image signal. Each readout can have a time duration of the main lobe of the RF excitation pulse or the readout can have a higher bandwidth with an increased number of readouts. The combining of multiple readouts diminishes slice profile modulation resulting from Fourier transform.
Claims20
A method of magnetic resonance imaging using view angle tilting comprising the steps of:
- (a) placing an object to be imaged in magnetic resonance imaging apparatus,
- (b) applying a RF excitation pulse to the object in the presence of an axial gradient (GZ),
- (c) reading out a plurality of image signals in the presence of a frequency select gradient (GX) and a slice select gradient (GZ), the slice select gradient (Gz) being refocused after each readout of an image signal, each readout having a bandwidth greater than the bandwidth of the RF excitation pulse and the number of readouts per excitation pulse being increased to maintain signal to noise ratio, and
- (d) combining the plurality of image signals.
In magnetic resonance imaging using view angle tilting comprising signal readout, a method of reducing blurring in a magnetic resonance image comprising the steps of:
- (a) acquiring multiple image readouts after each RF excitation pulse, each readout having a bandwidth greater than the bandwidth of the RF excitation pulse and the number of readouts per excitation pulse is increased to maintain signal to noise ratio, and
- (b) Combining the plurality of image readouts.
Dependencies are inferred from the claim text.