Modeling of the Hemodynamic Responses in Block Design fMRI Studies
The hemodynamic response function (HRF) describes the local response of brain vasculature to functional activation. Accurate HRF modeling enables the investigation of cerebral blood flow regulation and improves our ability to interpret fMRI results. Block designs have been used extensively as fMRI p...
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Veröffentlicht in: | Journal of cerebral blood flow and metabolism 2014-02, Vol.34 (2), p.316-324 |
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container_title | Journal of cerebral blood flow and metabolism |
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creator | Shan, Zuyao Y Wright, Margaret J Thompson, Paul M McMahon, Katie L Blokland, Gabriella G A M de Zubicaray, Greig I Martin, Nicholas G Vinkhuyzen, Anna A E Reutens, David C |
description | The hemodynamic response function (HRF) describes the local response of brain vasculature to functional activation. Accurate HRF modeling enables the investigation of cerebral blood flow regulation and improves our ability to interpret fMRI results. Block designs have been used extensively as fMRI paradigms because detection power is maximized; however, block designs are not optimal for HRF parameter estimation. Here we assessed the utility of block design fMRI data for HRF modeling. The trueness (relative deviation), precision (relative uncertainty), and identifiability (goodness-of-fit) of different HRF models were examined and test–retest reproducibility of HRF parameter estimates was assessed using computer simulations and fMRI data from 82 healthy young adult twins acquired on two occasions 3 to 4 months apart. The effects of systematically varying attributes of the block design paradigm were also examined. In our comparison of five HRF models, the model comprising the sum of two gamma functions with six free parameters had greatest parameter accuracy and identifiability. Hemodynamic response function height and time to peak were highly reproducible between studies and width was moderately reproducible but the reproducibility of onset time was low. This study established the feasibility and test–retest reliability of estimating HRF parameters using data from block design fMRI studies. |
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Accurate HRF modeling enables the investigation of cerebral blood flow regulation and improves our ability to interpret fMRI results. Block designs have been used extensively as fMRI paradigms because detection power is maximized; however, block designs are not optimal for HRF parameter estimation. Here we assessed the utility of block design fMRI data for HRF modeling. The trueness (relative deviation), precision (relative uncertainty), and identifiability (goodness-of-fit) of different HRF models were examined and test–retest reproducibility of HRF parameter estimates was assessed using computer simulations and fMRI data from 82 healthy young adult twins acquired on two occasions 3 to 4 months apart. The effects of systematically varying attributes of the block design paradigm were also examined. In our comparison of five HRF models, the model comprising the sum of two gamma functions with six free parameters had greatest parameter accuracy and identifiability. Hemodynamic response function height and time to peak were highly reproducible between studies and width was moderately reproducible but the reproducibility of onset time was low. 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Accurate HRF modeling enables the investigation of cerebral blood flow regulation and improves our ability to interpret fMRI results. Block designs have been used extensively as fMRI paradigms because detection power is maximized; however, block designs are not optimal for HRF parameter estimation. Here we assessed the utility of block design fMRI data for HRF modeling. The trueness (relative deviation), precision (relative uncertainty), and identifiability (goodness-of-fit) of different HRF models were examined and test–retest reproducibility of HRF parameter estimates was assessed using computer simulations and fMRI data from 82 healthy young adult twins acquired on two occasions 3 to 4 months apart. The effects of systematically varying attributes of the block design paradigm were also examined. In our comparison of five HRF models, the model comprising the sum of two gamma functions with six free parameters had greatest parameter accuracy and identifiability. Hemodynamic response function height and time to peak were highly reproducible between studies and width was moderately reproducible but the reproducibility of onset time was low. This study established the feasibility and test–retest reliability of estimating HRF parameters using data from block design fMRI studies.</description><subject>Adult</subject><subject>Blood Flow Velocity</subject><subject>Brain mapping</subject><subject>Cerebrovascular Circulation</subject><subject>Computer Simulation</subject><subject>Female</subject><subject>Humans</subject><subject>Magnetic Resonance Angiography</subject><subject>Male</subject><subject>Models, Cardiovascular</subject><subject>Original</subject><subject>Reproducibility of Results</subject><issn>0271-678X</issn><issn>1559-7016</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNqFkdFrFDEQh4Mo9jx99VECvgiy15nNZpN9EWzVttAiVAXfwt5mcs25m5ybXaH_vbu9WmoRfJkQ8uU3k3yMvURYIQh9uG3WrlvlgGIq8IgtUMoqU4DlY7aAXGFWKv39gD1LaQsAWkj5lB3kRS5zXagFO7qIllofNjw6PlwRP6Uu2utQd77hl5R2MSRK3Ad-1MbmB_9AyW8CdxeXZ_zLMFpP6Tl74uo20Yvbdcm-ffr49fg0O_98cnb8_jxrpBRD5qxFXUlJqqYCpK7EtC9KudaqQNTSAWnrdIkoVIOVFlXhcnTO4tqBJSWW7N0-dzeuO7INhaGvW7PrfVf31ybW3vx9EvyV2cRfRlQoc6imgDe3AX38OVIaTOdTQ21bB4pjMigBlCrlNO5_0aIqBJSAc-rrB-g2jn2YfmKmhAaBk6klW-2ppo8p9eTu5kYws0lzY9LMJqcyX3h1_7V3-B91E_B2D6R6Q_d6_jvuN2wqpk8</recordid><startdate>20140201</startdate><enddate>20140201</enddate><creator>Shan, Zuyao Y</creator><creator>Wright, Margaret J</creator><creator>Thompson, Paul M</creator><creator>McMahon, Katie L</creator><creator>Blokland, Gabriella G A M</creator><creator>de Zubicaray, Greig I</creator><creator>Martin, Nicholas G</creator><creator>Vinkhuyzen, Anna A E</creator><creator>Reutens, David C</creator><general>SAGE Publications</general><general>Sage Publications Ltd</general><general>Nature Publishing Group</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7X7</scope><scope>7XB</scope><scope>88A</scope><scope>88E</scope><scope>8AO</scope><scope>8FE</scope><scope>8FH</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>GNUQQ</scope><scope>HCIFZ</scope><scope>K9.</scope><scope>LK8</scope><scope>M0S</scope><scope>M1P</scope><scope>M7P</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>7X8</scope><scope>7TK</scope><scope>5PM</scope></search><sort><creationdate>20140201</creationdate><title>Modeling of the Hemodynamic Responses in Block Design fMRI Studies</title><author>Shan, Zuyao Y ; 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subjects | Adult Blood Flow Velocity Brain mapping Cerebrovascular Circulation Computer Simulation Female Humans Magnetic Resonance Angiography Male Models, Cardiovascular Original Reproducibility of Results |
title | Modeling of the Hemodynamic Responses in Block Design fMRI Studies |
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