Prospective acquisition correction for head motion with image-based tracking for real-time fMRI

Abstract

In functional magnetic resonance imaging (fMRI) head motion can corrupt the signal changes induced by brain activation. This paper describes a novel technique called Prospective Acquisition CorrEction (PACE) for reducing motion‐induced effects on magnetization history. Full three‐dimensional rigid body estimation of head movement is obtained by image‐based motion detection to a high level of accuracy. Adjustment of slice position and orientation, as well as regridding of residual volume to volume motion, is performed in real‐time during data acquisition. Phantom experiments demonstrate a high level of consistency (translation < 40μm; rotation < 0.05°) for detected motion parameters. In vivo experiments were carried out and they showed a significant decrease of variance between successively acquired datasets compared to retrospective correction algorithms. Magn Reson Med 44:457–465, 2000. © 2000 Wiley‐Liss, Inc.

Relative ability of fat and sugar tastes to activate reward, gustatory, and somatosensory regions

“…Thirty-two 4-mm slices (interleaved acquisition, no skip) were acquired along the anterior-commissure-posteriorcommissure transverse oblique plane, as determined by the midsagittal section. Rather than include motion regressors in analyses, a prospective acquisition correction was used to adjust the slice position and orientation as well as to regrid residual volume-to-volume motion in real time during data acquisition for the purpose of reducing motion-induced effects (19). Head motion .2 mm or degrees in any direction within each run was our a priori exclusion criterion, but no participants were excluded on this basis.…”

Functional connectivity MRI in infants: Exploration of the functional organization of the developing brain

“…However, patient motion also induces major artifactual changes in reconstructed image intensity (“spin history” effects) that cannot be remedied by spatial resampling. Prospective motion correction does not rectify “spin history” artifact (Thesen, Heid et al 2000). Thus, exclusion of epochs corrupted by extreme head motion is currently the only effective method to address this problem.…”

Effects of supplementation with essential amino acids on intrahepatic lipid concentrations during fructose overfeeding in humans

“…In brief, a volume of interest of 19 mL was localized in the liver evading large vessels and proximity to extrahepatic fat by using a double-echo localization sequence combined with Siemens prospective acquisition correction scheme (18) [magnetic resonance spectroscopy (MRS) echo time 30 ms, repetition time depending on breathing rate between 2.5 and 6 s]. MRS was preceded by fast-spin echo MRI in 3 planes by using the same prospective acquisition correction scheme triggering to visualize the liver and to reliably reproduce the placement of the region of interest in follow-up examinations.…”