NDLI: A New Distortion Model for Strong Inhomogeneity Problems in Echo-Planar MRI

Content Provider	IEEE Xplore Digital Library
Author	Zibetti, M.V.W. De Pierro, A.R.
Copyright Year	1982
Abstract	This paper proposes a new distortion model for strong inhomogeneity problems in echo planar imaging (EPI). Fast imaging sequences in magnetic resonance imaging (MRI), such as EPI, are very important in applications where temporal resolution or short total acquisition time is essential. Unfortunately, fast imaging sequences are very sensitive to variations in the homogeneity of the main magnetic field. The inhomogeneity leads to geometrical distortions and intensity changes in the image reconstructed via fast Fourier transform. Also, under strong inhomogeneity, the accelerated intravoxel dephase may overly attenuate signals coming from regions with higher inhomogeneity variations. Moreover, coarse discretization schemes for the inhomogeneity are not able to cope with this problem, producing discretization artifacts when large inhomogeneity variations occur. Most of the existing models do not attempt to solve this problem. In this paper, we propose a modification of the discrete distortion model to incorporate the effects of the intravoxel inhomogeneity and to minimize the discretization artifacts. As a result, these problems are significantly reduced. Extensive experiments are shown to demonstrate the achieved improvements. Also, the performance of the new model is evaluated for conjugate phase, least squares method (minimized iteratively using conjugated gradients), and regularized methods (using a total variation penalty).
Sponsorship	IEEE Engineering in Medicine and Biology Society IEEE Nuclear and Plasma Sciences Society IEEE Signal Processing Society IEEE Ultrasonics, Ferroelectrics, and Frequency Control Society
Page Count	18
File Size	7196682
Starting Page	1736
Ending Page	1753
File Format	PDF
ISSN	02780062
Volume Number	28
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic resonance imaging Radio frequency Magnetic fields Image resolution Image reconstruction Diffusion tensor imaging Spirals High-resolution imaging Fast Fourier transforms Acceleration total variation Discretization echo-planar imaging magnetic field inhomogeneity magnetic resonance imaging (MRI) regularization
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications Radiological and Ultrasound Technology Software

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Conjugate phase MRI reconstruction with spatially variant sample density correction

Accelerating Dynamic Spiral MRI by Algebraic Reconstruction From Undersampled $khbox{--}t$ Space

Joint Estimation and Correction of Geometric Distortions for EPI Functional MRI Using Harmonic Retrieval

Iterative Off-Resonance and Signal Decay Estimation and Correction for Multi-Echo MRI

Fast-scan imaging

Field Inhomogeneity Correction Based on Gridding Reconstruction for Magnetic Resonance Imaging

Accelerating the Nonequispaced Fast Fourier Transform on Commodity Graphics Hardware

Simulation of echo planar imaging in MRI: Application to assessment of field inhomogeneity and chemical shift

Correcting Susceptibility-Induced Distortion in Diffusion-Weighted MRI using Constrained Nonrigid Registration

A New Distortion Model for Strong Inhomogeneity Problems in Echo-Planar MRI

Similar Documents

Conjugate phase MRI reconstruction with spatially variant sample density correction

Accelerating Dynamic Spiral MRI by Algebraic Reconstruction From Undersampled $khbox{--}t$ Space

Joint Estimation and Correction of Geometric Distortions for EPI Functional MRI Using Harmonic Retrieval

Iterative Off-Resonance and Signal Decay Estimation and Correction for Multi-Echo MRI

Fast-scan imaging

Field Inhomogeneity Correction Based on Gridding Reconstruction for Magnetic Resonance Imaging

Accelerating the Nonequispaced Fast Fourier Transform on Commodity Graphics Hardware

Simulation of echo planar imaging in MRI: Application to assessment of field inhomogeneity and chemical shift

Correcting Susceptibility-Induced Distortion in Diffusion-Weighted MRI using Constrained Nonrigid Registration

A New Distortion Model for Strong Inhomogeneity Problems in Echo-Planar MRI