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FUSING BROADBAND SINGLE-POINT IMAGES WITH MAVRIC SL TO REGAIN LOST SIGNAL NEAR IMPLANT SURFACES

IP.com Disclosure Number: IPCOM000237710D
Publication Date: 2014-Jul-04
Document File: 4 page(s) / 202K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention includes a technique to remove bulk distortion in an image due to metal implants in a magnetic resonance imaging (MRI) system. The technique includes an ultra-high bandwidth single point which is 3D Cartesian encoded and which utilizes silent MR pulse-sequence. The technique includes multi-acquisition with variable resonance image combination (MAVRIC SL) images and field map to fuse with single-point 3D phase-encoded acquisition based on silent technology to capture the signal. The technique involves acquisition of a three dimensional multi-spectral image (3D-MSI), which includes area of residual signal loss. A lower-resolution broadband single point acquisition is also acquired and fused with the 3D-MSI images to form a composite image-encapsulating signal around the metallic device.

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FUSING BROADBAND SINGLE-POINT IMAGES WITH MAVRIC SL TO REGAIN LOST SIGNAL NEAR IMPLANT SURFACES

FIELD OF INVENTION

The invention generally relates to a magnetic resonance imaging (MRI) system and more particularly to technique of regaining lost signal near implant surface in the MRI system.

BACKGROUND OF THE INVENTION


Certain implants, particularly, at about 3 Tesla (T) show signal loss in certain regions near vicinity of the implant interface. The implants results in signal loss, which range from a few millimeter (mm) to a few centimeter (cm) from the implant interface. This effect clearly distorts shape of the implants despite lack of any distortion. Due to tendon insertion and possible soft tissue damage there are small signal loss regions. Frequency-encoding with finite sampling does not capture every signal near metal implants, particularly, some high susceptibility alloys at 1.5T and 3T.

A convention technique includes a technique to reduce bulk image distortion to single pixel level. However, the conventional technique has signal loss, which is limitation for any frequency-encoded acquisition.

Another conventional technique includes utilization of single point three dimensional fast spin echo (3D-FSE) acquisition and collection of multiple off resonant images. However, the conventional technique results in substantial scan time difficulties for a single point encoded technique.

Therefore, there is a need for a technique that allows frequency encoded finite sample to capture all signals near the metal implants.

BRIEF DESCRIPTION OF THE INVENTION

The invention includes a technique to remove bulk distortion in the image due to metal implants in a magnetic resonance imaging (MRI) system. The technique includes an ultra-high bandwidth single point which is 3D Cartesian encoded and which utilizes silent MR pulse-sequence.

DETAILED DESCRIPTION OF THE INVENTION


The invention includes a technique to remove bulk distortion in the image due to metal implants in a magnetic resonance imaging (MRI) system. The technique includes an ultra-high bandwidth single point which is 3D Cartesian encoded and which utilizes silent MR pulse-sequence.


The technique includes multi-acquisition with variable resonance image combination (MAVRIC SL) images and field map to fuse with single-point 3D phase-encoded acquisition based on silent technology...