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Functional Laterality of Task-Evoked Activation in Sensorimotor Cortex of Preterm Infants: An Optimized 3 T fMRI Study Employing a Customized Neonatal Head Coil

BACKGROUND: Functional magnetic resonance imaging (fMRI) in neonates has been introduced as a non-invasive method for studying sensorimotor processing in the developing brain. However, previous neonatal studies have delivered conflicting results regarding localization, lateralization, and directiona...

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Autores principales: Scheef, Lukas, Nordmeyer-Massner, Jurek A., Smith-Collins, Adam PR, Müller, Nicole, Stegmann-Woessner, Gaby, Jankowski, Jacob, Gieseke, Jürgen, Born, Mark, Seitz, Hermann, Bartmann, Peter, Schild, Hans H., Pruessmann, Klaas P., Heep, Axel, Boecker, Henning
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5226735/
https://www.ncbi.nlm.nih.gov/pubmed/28076368
http://dx.doi.org/10.1371/journal.pone.0169392
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author Scheef, Lukas
Nordmeyer-Massner, Jurek A.
Smith-Collins, Adam PR
Müller, Nicole
Stegmann-Woessner, Gaby
Jankowski, Jacob
Gieseke, Jürgen
Born, Mark
Seitz, Hermann
Bartmann, Peter
Schild, Hans H.
Pruessmann, Klaas P.
Heep, Axel
Boecker, Henning
author_facet Scheef, Lukas
Nordmeyer-Massner, Jurek A.
Smith-Collins, Adam PR
Müller, Nicole
Stegmann-Woessner, Gaby
Jankowski, Jacob
Gieseke, Jürgen
Born, Mark
Seitz, Hermann
Bartmann, Peter
Schild, Hans H.
Pruessmann, Klaas P.
Heep, Axel
Boecker, Henning
author_sort Scheef, Lukas
collection PubMed
description BACKGROUND: Functional magnetic resonance imaging (fMRI) in neonates has been introduced as a non-invasive method for studying sensorimotor processing in the developing brain. However, previous neonatal studies have delivered conflicting results regarding localization, lateralization, and directionality of blood oxygenation level dependent (BOLD) responses in sensorimotor cortex (SMC). Amongst the confounding factors in interpreting neonatal fMRI studies include the use of standard adult MR-coils providing insufficient signal to noise, and liberal statistical thresholds, compromising clinical interpretation at the single subject level. PATIENTS / METHODS: Here, we employed a custom-designed neonatal MR-coil adapted and optimized to the head size of a newborn in order to improve robustness, reliability and validity of neonatal sensorimotor fMRI. Thirteen preterm infants with a median gestational age of 26 weeks were scanned at term-corrected age using a prototype 8-channel neonatal head coil at 3T (Achieva, Philips, Best, NL). Sensorimotor stimulation was elicited by passive extension/flexion of the elbow at 1 Hz in a block design. Analysis of temporal signal to noise ratio (tSNR) was performed on the whole brain and the SMC, and was compared to data acquired with an ‘adult’ 8 channel head coil published previously. Task-evoked activation was determined by single-subject SPM8 analyses, thresholded at p < 0.05, whole-brain FWE-corrected. RESULTS: Using a custom-designed neonatal MR-coil, we found significant positive BOLD responses in contralateral SMC after unilateral passive sensorimotor stimulation in all neonates (analyses restricted to artifact-free data sets = 8/13). Improved imaging characteristics of the neonatal MR-coil were evidenced by additional phantom and in vivo tSNR measurements: phantom studies revealed a 240% global increase in tSNR; in vivo studies revealed a 73% global and a 55% local (SMC) increase in tSNR, as compared to the ‘adult’ MR-coil. CONCLUSIONS: Our findings strengthen the importance of using optimized coil settings for neonatal fMRI, yielding robust and reproducible SMC activation at the single subject level. We conclude that functional lateralization of SMC activation, as found in children and adults, is already present in the newborn period.
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spelling pubmed-52267352017-01-31 Functional Laterality of Task-Evoked Activation in Sensorimotor Cortex of Preterm Infants: An Optimized 3 T fMRI Study Employing a Customized Neonatal Head Coil Scheef, Lukas Nordmeyer-Massner, Jurek A. Smith-Collins, Adam PR Müller, Nicole Stegmann-Woessner, Gaby Jankowski, Jacob Gieseke, Jürgen Born, Mark Seitz, Hermann Bartmann, Peter Schild, Hans H. Pruessmann, Klaas P. Heep, Axel Boecker, Henning PLoS One Research Article BACKGROUND: Functional magnetic resonance imaging (fMRI) in neonates has been introduced as a non-invasive method for studying sensorimotor processing in the developing brain. However, previous neonatal studies have delivered conflicting results regarding localization, lateralization, and directionality of blood oxygenation level dependent (BOLD) responses in sensorimotor cortex (SMC). Amongst the confounding factors in interpreting neonatal fMRI studies include the use of standard adult MR-coils providing insufficient signal to noise, and liberal statistical thresholds, compromising clinical interpretation at the single subject level. PATIENTS / METHODS: Here, we employed a custom-designed neonatal MR-coil adapted and optimized to the head size of a newborn in order to improve robustness, reliability and validity of neonatal sensorimotor fMRI. Thirteen preterm infants with a median gestational age of 26 weeks were scanned at term-corrected age using a prototype 8-channel neonatal head coil at 3T (Achieva, Philips, Best, NL). Sensorimotor stimulation was elicited by passive extension/flexion of the elbow at 1 Hz in a block design. Analysis of temporal signal to noise ratio (tSNR) was performed on the whole brain and the SMC, and was compared to data acquired with an ‘adult’ 8 channel head coil published previously. Task-evoked activation was determined by single-subject SPM8 analyses, thresholded at p < 0.05, whole-brain FWE-corrected. RESULTS: Using a custom-designed neonatal MR-coil, we found significant positive BOLD responses in contralateral SMC after unilateral passive sensorimotor stimulation in all neonates (analyses restricted to artifact-free data sets = 8/13). Improved imaging characteristics of the neonatal MR-coil were evidenced by additional phantom and in vivo tSNR measurements: phantom studies revealed a 240% global increase in tSNR; in vivo studies revealed a 73% global and a 55% local (SMC) increase in tSNR, as compared to the ‘adult’ MR-coil. CONCLUSIONS: Our findings strengthen the importance of using optimized coil settings for neonatal fMRI, yielding robust and reproducible SMC activation at the single subject level. We conclude that functional lateralization of SMC activation, as found in children and adults, is already present in the newborn period. Public Library of Science 2017-01-11 /pmc/articles/PMC5226735/ /pubmed/28076368 http://dx.doi.org/10.1371/journal.pone.0169392 Text en © 2017 Scheef et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Scheef, Lukas
Nordmeyer-Massner, Jurek A.
Smith-Collins, Adam PR
Müller, Nicole
Stegmann-Woessner, Gaby
Jankowski, Jacob
Gieseke, Jürgen
Born, Mark
Seitz, Hermann
Bartmann, Peter
Schild, Hans H.
Pruessmann, Klaas P.
Heep, Axel
Boecker, Henning
Functional Laterality of Task-Evoked Activation in Sensorimotor Cortex of Preterm Infants: An Optimized 3 T fMRI Study Employing a Customized Neonatal Head Coil
title Functional Laterality of Task-Evoked Activation in Sensorimotor Cortex of Preterm Infants: An Optimized 3 T fMRI Study Employing a Customized Neonatal Head Coil
title_full Functional Laterality of Task-Evoked Activation in Sensorimotor Cortex of Preterm Infants: An Optimized 3 T fMRI Study Employing a Customized Neonatal Head Coil
title_fullStr Functional Laterality of Task-Evoked Activation in Sensorimotor Cortex of Preterm Infants: An Optimized 3 T fMRI Study Employing a Customized Neonatal Head Coil
title_full_unstemmed Functional Laterality of Task-Evoked Activation in Sensorimotor Cortex of Preterm Infants: An Optimized 3 T fMRI Study Employing a Customized Neonatal Head Coil
title_short Functional Laterality of Task-Evoked Activation in Sensorimotor Cortex of Preterm Infants: An Optimized 3 T fMRI Study Employing a Customized Neonatal Head Coil
title_sort functional laterality of task-evoked activation in sensorimotor cortex of preterm infants: an optimized 3 t fmri study employing a customized neonatal head coil
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5226735/
https://www.ncbi.nlm.nih.gov/pubmed/28076368
http://dx.doi.org/10.1371/journal.pone.0169392
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