PURPOSE: To investigate if delays in resting-state spontaneous fluctuations of the BOLD (sfBOLD) signal can be used to create maps similar to time-to-maximum of the residue function (Tmax) in Moyamoya patients and to determine whether sfBOLD delays affect the results of brain connectivity mapping. MATERIALS AND METHODS: Ten patients were scanned at 3 Tesla using a gradient-echo echo planar imaging sequence for sfBOLD imaging. Cross correlation analysis was performed between each brain voxel signal and a reference signal comprised of either the superior sagittal sinus (SSS) or whole brain (WB) average time course. sfBOLD delay maps were created based on the time shift necessary to maximize the correlation coefficient, and compared with dynamic susceptibility contrast Tmax maps. Standard and time-shifted resting-state BOLD connectivity analyses of the default mode network were compared. RESULTS: Good linear correlations were found between sfBOLD delays and Tmax using the SSS as reference (r(2) = 0.8, slope = 1.4, intercept = -4.6) or WB (r(2) = 0.7, slope = 0.8, intercept = -3.2). New nodes of connectivity were found in delayed regions when accounting for delays in the analysis. CONCLUSION: Resting-state sfBOLD imaging can create delay maps similar to Tmax maps without the use of contrast agents in Moyamoya patients. Accounting for these delays may affect the results of functional connectivity maps.
PURPOSE: To investigate if delays in resting-state spontaneous fluctuations of the BOLD (sfBOLD) signal can be used to create maps similar to time-to-maximum of the residue function (Tmax) in Moyamoya patients and to determine whether sfBOLD delays affect the results of brain connectivity mapping. MATERIALS AND METHODS: Ten patients were scanned at 3 Tesla using a gradient-echo echo planar imaging sequence for sfBOLD imaging. Cross correlation analysis was performed between each brain voxel signal and a reference signal comprised of either the superior sagittal sinus (SSS) or whole brain (WB) average time course. sfBOLD delay maps were created based on the time shift necessary to maximize the correlation coefficient, and compared with dynamic susceptibility contrast Tmax maps. Standard and time-shifted resting-state BOLD connectivity analyses of the default mode network were compared. RESULTS: Good linear correlations were found between sfBOLD delays and Tmax using the SSS as reference (r(2) = 0.8, slope = 1.4, intercept = -4.6) or WB (r(2) = 0.7, slope = 0.8, intercept = -3.2). New nodes of connectivity were found in delayed regions when accounting for delays in the analysis. CONCLUSION: Resting-state sfBOLD imaging can create delay maps similar to Tmax maps without the use of contrast agents in Moyamoya patients. Accounting for these delays may affect the results of functional connectivity maps.
Authors: Greg Zaharchuk; Roland Bammer; Matus Straka; Ajit Shankaranarayan; David C Alsop; Nancy J Fischbein; Scott W Atlas; Michael E Moseley Journal: Radiology Date: 2009-07-31 Impact factor: 11.105
Authors: Hesamoddin Jahanian; Thomas Christen; Michael E Moseley; Nicholas M Pajewski; Clinton B Wright; Manjula K Tamura; Greg Zaharchuk Journal: J Cereb Blood Flow Metab Date: 2016-01-01 Impact factor: 6.200
Authors: Manus J Donahue; Eric Achten; Petrice M Cogswell; Frank-Erik De Leeuw; Colin P Derdeyn; Rick M Dijkhuizen; Audrey P Fan; Rashid Ghaznawi; Jeremy J Heit; M Arfan Ikram; Peter Jezzard; Lori C Jordan; Eric Jouvent; Linda Knutsson; Richard Leigh; David S Liebeskind; Weili Lin; Thomas W Okell; Adnan I Qureshi; Charlotte J Stagg; Matthias Jp van Osch; Peter Cm van Zijl; Jennifer M Watchmaker; Max Wintermark; Ona Wu; Greg Zaharchuk; Jinyuan Zhou; Jeroen Hendrikse Journal: J Cereb Blood Flow Metab Date: 2017-08-17 Impact factor: 6.200