Forskning
Udskriv Udskriv
Switch language
Region Hovedstaden - en del af Københavns Universitetshospital
Udgivet

Inductive measurement and encoding of k-space trajectories in MR raw data

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Harvard

APA

CBE

MLA

Vancouver

Author

Bibtex

@article{10620a87d4f741d38901a84038f23f8c,
title = "Inductive measurement and encoding of k-space trajectories in MR raw data",
abstract = "OBJECTIVES: The objective of this study was to concurrently acquire an inductive k-space trajectory measure and corresponding imaging data by an MR scanner.MATERIALS AND METHODS: 1D gradient measures were obtained by digital integration, regularized using measured gradient coil currents and recorded individually by the scanner concurrently with raw MR data. Gradient measures were frequency modulated into an RF signal receivable by the scanner, yielding a k-space trajectory measure from the cumulative phase of the acquired data. Generation of the gradient measure and frequency modulation was performed by previously developed custom, versatile circuitry.RESULTS: For a normal echo planar imaging (EPI) sequence, the acquired k-space trajectory measure yielded slightly improved image quality compared to that obtained from using the scanner's estimated eddy current-compensated k-space trajectory. For a spiral trajectory, the regularized inductive k-space trajectory measure lead to a 76{\%} decrease in the root-mean-square error of the reconstructed image.DISCUSSION: While the proof-of-concept experiments show potential for further improvement, the feasibility of inductively measuring k-space trajectories and increasing the precision through regularization was demonstrated. The approach may offer an inexpensive method to acquire k-space trajectories concurrently with scanning.",
keywords = "Encoding of signals in MRI raw data, Gradient imperfections, Inductive measurement of k-space trajectories, Magnetic resonance imaging, Regularization by current measure",
author = "Pedersen, {Jan Ole} and Hanson, {Christian G} and Rong Xue and Hanson, {Lars G}",
year = "2019",
month = "12",
doi = "10.1007/s10334-019-00770-2",
language = "English",
volume = "32",
pages = "655--667",
journal = "Magnetic Resonance Materials in Physics, Biology and Medicine",
issn = "0968-5243",
publisher = "Springer",
number = "6",

}

RIS

TY - JOUR

T1 - Inductive measurement and encoding of k-space trajectories in MR raw data

AU - Pedersen, Jan Ole

AU - Hanson, Christian G

AU - Xue, Rong

AU - Hanson, Lars G

PY - 2019/12

Y1 - 2019/12

N2 - OBJECTIVES: The objective of this study was to concurrently acquire an inductive k-space trajectory measure and corresponding imaging data by an MR scanner.MATERIALS AND METHODS: 1D gradient measures were obtained by digital integration, regularized using measured gradient coil currents and recorded individually by the scanner concurrently with raw MR data. Gradient measures were frequency modulated into an RF signal receivable by the scanner, yielding a k-space trajectory measure from the cumulative phase of the acquired data. Generation of the gradient measure and frequency modulation was performed by previously developed custom, versatile circuitry.RESULTS: For a normal echo planar imaging (EPI) sequence, the acquired k-space trajectory measure yielded slightly improved image quality compared to that obtained from using the scanner's estimated eddy current-compensated k-space trajectory. For a spiral trajectory, the regularized inductive k-space trajectory measure lead to a 76% decrease in the root-mean-square error of the reconstructed image.DISCUSSION: While the proof-of-concept experiments show potential for further improvement, the feasibility of inductively measuring k-space trajectories and increasing the precision through regularization was demonstrated. The approach may offer an inexpensive method to acquire k-space trajectories concurrently with scanning.

AB - OBJECTIVES: The objective of this study was to concurrently acquire an inductive k-space trajectory measure and corresponding imaging data by an MR scanner.MATERIALS AND METHODS: 1D gradient measures were obtained by digital integration, regularized using measured gradient coil currents and recorded individually by the scanner concurrently with raw MR data. Gradient measures were frequency modulated into an RF signal receivable by the scanner, yielding a k-space trajectory measure from the cumulative phase of the acquired data. Generation of the gradient measure and frequency modulation was performed by previously developed custom, versatile circuitry.RESULTS: For a normal echo planar imaging (EPI) sequence, the acquired k-space trajectory measure yielded slightly improved image quality compared to that obtained from using the scanner's estimated eddy current-compensated k-space trajectory. For a spiral trajectory, the regularized inductive k-space trajectory measure lead to a 76% decrease in the root-mean-square error of the reconstructed image.DISCUSSION: While the proof-of-concept experiments show potential for further improvement, the feasibility of inductively measuring k-space trajectories and increasing the precision through regularization was demonstrated. The approach may offer an inexpensive method to acquire k-space trajectories concurrently with scanning.

KW - Encoding of signals in MRI raw data

KW - Gradient imperfections

KW - Inductive measurement of k-space trajectories

KW - Magnetic resonance imaging

KW - Regularization by current measure

UR - http://www.scopus.com/inward/record.url?scp=85069945081&partnerID=8YFLogxK

U2 - 10.1007/s10334-019-00770-2

DO - 10.1007/s10334-019-00770-2

M3 - Journal article

VL - 32

SP - 655

EP - 667

JO - Magnetic Resonance Materials in Physics, Biology and Medicine

JF - Magnetic Resonance Materials in Physics, Biology and Medicine

SN - 0968-5243

IS - 6

ER -

ID: 57715282