NDLI: A Method to Localize RF <formula formulatype=inline><tex Notation=TeX>${bm B}_{bf 1}$</tex></formula> Field in High-Field Magnetic Resonance Imaging Systems

Content Provider	IEEE Xplore Digital Library
Author	Hyoungsuk Yoo Gopinath, A. Vaughan, J.T.
Copyright Year	1964
Abstract	In high-field magnetic resonance imaging (MRI) systems, B₀ fields of 7 and 9.4 T, the RF field shows greater inhomogeneity compared to clinical MRI systems with B₀ fields of 1.5 and 3.0 T. In multichannel RF coils, the magnitude and phase of the input to each coil element can be controlled independently to reduce the nonuniformity of the RF field. The convex optimization technique has been used to obtain the optimum excitation parameters with iterative solutions for homogeneity in a selected region of interest. The pseudoinverse method has also been used to find a solution. The simulation results for 9.4- and 7-T MRI systems are discussed in detail for the head model. Variation of the simulation results in a 9.4-T system with the number of RF coil elements for different positions of the regions of interest in a spherical phantom are also discussed. Experimental results were obtained in a phantom in the 9.4-T system and are compared to the simulation results and the specific absorption rate has been evaluated.
Sponsorship	IEEE Engineering in Medicine and Biology Society
Page Count	7
File Size	993803
Starting Page	3365
Ending Page	3371
File Format	PDF
ISSN	00189294
Volume Number	59
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Head Convex functions Magnetic resonance imaging Radio frequency Phantoms transmission line head coil Convex optimization high-field MRI magnetic resonance imaging (MRI) pseudoinverse parallel excitation RF ${\bm B}_{\bf 1}$ field
Content Type	Text
Resource Type	Article
Subject	Biomedical Engineering

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

Multichannel Double-Row Transmission Line Array for Human MR Imaging at Ultrahigh Fields

RF $B_1$ Field Calculation With Transmission-Line Resonator Analysis for High-Field Magnetic Resonance Systems

RF Head Coil Design With Improved RF Magnetic Near-Fields Uniformity for Magnetic Resonance Imaging (MRI) Systems

Sparsity-Enforced Slice-Selective MRI RF Excitation Pulse Design

B 1 field comparison for RF coils in ultra-high-field MRI

Shielded Microstrip Array for 7T Human MR Imaging

Design of an Electrically Automated RF Transceiver Head Coil in MRI

From Complex ${rm B}_{1}$ Mapping to Local SAR Estimation for Human Brain MR Imaging Using Multi-Channel Transceiver Coil at 7T

7T Human Spine Imaging Arrays With Adjustable Inductive Decoupling

A Method to Localize RF ${bm B}_{bf 1}$ Field in High-Field Magnetic Resonance Imaging Systems

Similar Documents

Multichannel Double-Row Transmission Line Array for Human MR Imaging at Ultrahigh Fields

RF $B_1$ Field Calculation With Transmission-Line Resonator Analysis for High-Field Magnetic Resonance Systems

RF Head Coil Design With Improved RF Magnetic Near-Fields Uniformity for Magnetic Resonance Imaging (MRI) Systems

Sparsity-Enforced Slice-Selective MRI RF Excitation Pulse Design

B 1 field comparison for RF coils in ultra-high-field MRI

Shielded Microstrip Array for 7T Human MR Imaging

Design of an Electrically Automated RF Transceiver Head Coil in MRI

From Complex ${rm B}_{1}$ Mapping to Local SAR Estimation for Human Brain MR Imaging Using Multi-Channel Transceiver Coil at 7T

7T Human Spine Imaging Arrays With Adjustable Inductive Decoupling

A Method to Localize RF ${bm B}_{bf 1}$ Field in High-Field Magnetic Resonance Imaging Systems