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BLURRING REDUCTION WITH CUBE PULSE SEQUENCE

IP.com Disclosure Number: IPCOM000235510D
Publication Date: 2014-Mar-05
Document File: 5 page(s) / 410K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention provides a technique to maintain a constant signal or an echo train after a center of k-space in a magnetic resonance imaging (MRI) system. The constant signal or the echo train allows reducing blurring in a CUBE sequence image in the MRI system. A modulated flip angle refocusing radiofrequency (RF) pulse enables very long echo train to generate T2 weighted soft tissue image with reduced blurring and low sound to noise ratio (SNR).The technique performs an interleaved acquisition where for a given slice-encoding gradient (Kz), a phase encoding gradient is played once in ascending order which include Ky from –Kymax to +Kymax. Thereafter, for the same slice encoding gradient (Kz), the phase encoding gradient is played in reverse order or descending order which includes Ky going from +Kymax to –Kymax.

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BLURRING REDUCTION WITH CUBE PULSE SEQUENCE

FIELD OF INVENTION

The invention generally relates to a magnetic resonance imaging (MRI) system and more particularly to a technique for reducing blurring of image in the MRI system.

BACKGROUND OF THE INVENTION

A CUBE sequence in a magnetic resonance imaging (MRI) system is an imaging sequence utilized for producing an image. The CUBE is a single-slab 3D Fast Spin Echo (FSE) imaging sequence. The CUBE sequence utilizes a modulated flip angle to refocus radio frequency (RF) pulses. As a result, a relatively flat signal is produced in a given material. The modulated flip angle of the refocusing RF pulse is determined to allow the signal to be relatively flat until center of k-space is reached. Thereafter, the signal gradually decreases as echo train approaches to end. Decrease in the signal after the center of the k-space result in amplitude modulation of the k-space data. This results in blurring in the CUBE image, which leads to customer dissatisfaction.

A conventional technique includes compensating T2 decay option to reduce blur in images. However, the conventional technique does not enable reduction in blur with the CUBE sequence.

Hence there exists a need for an efficient technique to reduce blur in the image by the CUBE sequence in the MRI system.

BRIEF DESCRIPTION OF THE INVENTION

The invention provides a technique to maintain a constant signal or an echo train after a center of k-space in a magnetic resonance imaging (MRI) system. The constant signal or the echo train allows reducing blurring in a CUBE sequence image in the MRI system. A modulated flip angle refocusing RF pulse enables very long echo train to generate T2 weighted soft tissue image with reduced blurring and low sound to noise ratio (SNR).

DETAILED DESCRIPTION OF THE INVENTION

The invention provides a technique to maintain a constant signal or an echo train after a center of k-space in a magnetic resonance imaging (MRI) system. The constant signal or the echo train allows reducing blurring in a CUBE sequence image in the MRI system. A modulated flip angle refocusing RF pulse enables very long echo train to generate T2 weighted soft tissue image with reduced blurring and low sound to noise ratio (SNR). FIG. 1 depicts reduced blurring and low SNR compared to 3D FSE.

FIG.  1

The technique performs an interleaved acquisition where for a given slice-encoding gradient (Kz), a phase...