Parameter estimation in the magnitude-only and complex-valued fMRI data models.

Abstract:

:In functional magnetic resonance imaging, voxel time courses are complex-valued data but are traditionally converted to real magnitude-only data ones. At a large signal-to-noise ratio (SNR), the magnitude-only data Ricean distribution is approximated by a normal distribution that has been suggested as reasonable in magnitude-only data magnetic resonance images for an SNR of 5 and potentially as low as 3. A complex activation model has been recently introduced by Rowe and Logan [Rowe, D.B., and Logan, B.R. (2004). A complex way to compute fMRI activation. NeuroImage, 23 (3):1078-1092] that is valid for all SNRs. The properties of the parameter estimators and activation statistic for these two models and a more accurate Ricean approximation based on a Taylor series expansion are characterized in terms of bias, variance, and Cramer-Rao lower bound. It was found that the unbiased estimators in the complex model continued to be unbiased for lower SNRs while those of the normal magnitude-only data model became biased as the SNR decreased and at differing levels for the regression coefficients. The unbiased parameter estimators from the approximate magnitude-only Ricean Taylor model were unbiased to lower SNRs than the magnitude-only normal ones. Further, the variances of the parameter estimators achieved their minimum value in the complex data model regardless of SNR while the magnitude-only data normal model and Ricean approximation using a Taylor series did not as the SNR decreased. Finally, the mean activation statistic for the complex data model was higher and not SNR dependent while it decreased with SNR in the magnitude-only data models but less so for the approximate Ricean model. These results indicate that using the complex data model and not approximations to the true magnitude-only Ricean data model is more appropriate at lower SNRs. Therefore, since the computational cost is relatively low for the complex data model and since the SNR is not inherently known a priori for all voxels, the complex data model is recommended at all SNRs.

journal_name

Neuroimage

journal_title

NeuroImage

authors

Rowe DB

doi

10.1016/j.neuroimage.2004.12.048

keywords:

subject

Has Abstract

pub_date

2005-05-01 00:00:00

pages

1124-32

issue

4

eissn

1053-8119

issn

1095-9572

pii

S1053-8119(04)00802-X

journal_volume

25

pub_type

杂志文章
  • Joint neuronal tuning for object form and position in the human lateral occipital complex.

    abstract::A long-standing heuristic in visual neuroscience holds that extrastriate visual cortex is parceled into a dorsal "where" pathway concerned with stimulus position and motion and a ventral "what" pathway concerned with stimulus form. Several recent studies using functional magnetic resonance imaging (fMRI), however, hav...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2012.08.043

    authors: MacEvoy SP,Yang Z

    更新日期:2012-12-01 00:00:00

  • Multi-template analysis of human perirhinal cortex in brain MRI: Explicitly accounting for anatomical variability.

    abstract:RATIONAL:The human perirhinal cortex (PRC) plays critical roles in episodic and semantic memory and visual perception. The PRC consists of Brodmann areas 35 and 36 (BA35, BA36). In Alzheimer's disease (AD), BA35 is the first cortical site affected by neurofibrillary tangle pathology, which is closely linked to neural i...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2016.09.070

    authors: Xie L,Pluta JB,Das SR,Wisse LEM,Wang H,Mancuso L,Kliot D,Avants BB,Ding SL,Manjón JV,Wolk DA,Yushkevich PA

    更新日期:2017-01-01 00:00:00

  • Decomposing alpha and 1/f brain activities reveals their differential associations with cognitive processing speed.

    abstract::Research in cognitive neuroscience has extensively demonstrated that the temporal dynamics of brain activity are associated with cognitive functioning. The temporal dynamics mainly include oscillatory and 1/f noise-like, non-oscillatory brain activities that coexist in many forms of brain activity and confound each ot...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2019.116304

    authors: Ouyang G,Hildebrandt A,Schmitz F,Herrmann CS

    更新日期:2020-01-15 00:00:00

  • Real diffusion-weighted MRI enabling true signal averaging and increased diffusion contrast.

    abstract::This project aims to characterize the impact of underlying noise distributions on diffusion-weighted imaging. The noise floor is a well-known problem for traditional magnitude-based diffusion-weighted MRI (dMRI) data, leading to biased diffusion model fits and inaccurate signal averaging. Here, we introduce a total-va...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2015.07.074

    authors: Eichner C,Cauley SF,Cohen-Adad J,Möller HE,Turner R,Setsompop K,Wald LL

    更新日期:2015-11-15 00:00:00

  • The New York Head-A precise standardized volume conductor model for EEG source localization and tES targeting.

    abstract::In source localization of electroencephalograpic (EEG) signals, as well as in targeted transcranial electric current stimulation (tES), a volume conductor model is required to describe the flow of electric currents in the head. Boundary element models (BEM) can be readily computed to represent major tissue compartment...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2015.12.019

    authors: Huang Y,Parra LC,Haufe S

    更新日期:2016-10-15 00:00:00

  • Brain dynamics in the comprehension of action-related language. A time-frequency analysis of mu rhythms.

    abstract::EEG mu rhythms (8-13 Hz) recorded at fronto-central electrodes are generally considered as markers of motor cortical activity in humans, because they are modulated when participants perform an action, when they observe another's action or even when they imagine performing an action. In this study, we analyzed the time...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2015.01.018

    authors: Moreno I,de Vega M,León I,Bastiaansen M,Glen Lewis A,Magyari L

    更新日期:2015-04-01 00:00:00

  • Source localization of ictal epileptic activity investigated by high resolution EEG and validated by SEEG.

    abstract::High resolution electroencephalography (HR-EEG) combined with source localization methods has mainly been used to study interictal spikes and there have been few studies comparing source localization of scalp ictal patterns with depth EEG. To address this issue, 10 patients with four different scalp ictal patterns (ic...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2010.02.067

    authors: Koessler L,Benar C,Maillard L,Badier JM,Vignal JP,Bartolomei F,Chauvel P,Gavaret M

    更新日期:2010-06-01 00:00:00

  • How are things adding up? Neural differences between arithmetic operations are due to general problem solving strategies.

    abstract::A number of previous studies have interpreted differences in brain activation between arithmetic operation types (e.g. addition and multiplication) as evidence in favor of distinct cortical representations, processes or neural systems. It is still not clear how differences in general task complexity contribute to thes...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2014.01.061

    authors: Tschentscher N,Hauk O

    更新日期:2014-05-15 00:00:00

  • Ultra-high field MRI: Advancing systems neuroscience towards mesoscopic human brain function.

    abstract::Human MRI scanners at ultra-high magnetic field strengths of 7 T and higher are increasingly available to the neuroscience community. A key advantage brought by ultra-high field MRI is the possibility to increase the spatial resolution at which data is acquired, with little reduction in image quality. This opens a new...

    journal_title:NeuroImage

    pub_type: 杂志文章,评审

    doi:10.1016/j.neuroimage.2017.01.028

    authors: Dumoulin SO,Fracasso A,van der Zwaag W,Siero JCW,Petridou N

    更新日期:2018-03-01 00:00:00

  • Deficits in ascending and descending pain modulation pathways in patients with postherpetic neuralgia.

    abstract::Postherpetic Neuralgia (PHN), develops after the resolution of the herpes zoster mucocutaneous eruption, is a debilitating chronic pain. However, there is a lack of knowledge regarding the underlying mechanisms associated with ascending and descending pain modulations in PHN patients. Here, we combined psychophysics w...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2020.117186

    authors: Li H,Li X,Feng Y,Gao F,Kong Y,Hu L

    更新日期:2020-11-01 00:00:00

  • The representation of shape in the context of visual object categorization tasks.

    abstract::To investigate the role of human fusiform gyrus in shape processing, we determined the effect of shape degradation on BOLD contrast in this region with fMRI during three tasks requiring subjects to determine either whether two successively presented nonsense shapes had the same global orientation (OR task); whether tw...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1006/nimg.2000.0598

    authors: Op de Beeck H,Béatse E,Wagemans J,Sunaert S,Van Hecke P

    更新日期:2000-07-01 00:00:00

  • "Gating" effects of simultaneous peripheral electrical stimulations on human secondary somatosensory cortex: a whole-head MEG study.

    abstract::The secondary somatosensory cortex (SII) is strongly involved in the processing of somatosensory tactile and nociceptive sensations. We investigated the effect on SII responses of simultaneous painful and nonpainful electrical stimulations delivered to the thumb and little finger. According to the "bimodal" (i.e., noc...

    journal_title:NeuroImage

    pub_type: 临床试验,杂志文章

    doi:10.1016/s1053-8119(03)00439-7

    authors: Torquati K,Pizzella V,Della Penna S,Franciotti R,Babiloni C,Romani GL,Rossini PM

    更新日期:2003-11-01 00:00:00

  • The spatial distribution of age-related white matter changes as a function of vascular risk factors--results from the LADIS study.

    abstract::White matter hyperintensities (WMH) are a frequent finding on brain MRI of elderly subjects, and have been associated with various risk factors, as well as with development of cognitive and functional impairment. While an overall association between WMH load and risk factors is well described, possible spatially restr...

    journal_title:NeuroImage

    pub_type: 杂志文章,多中心研究

    doi:10.1016/j.neuroimage.2012.01.106

    authors: Rostrup E,Gouw AA,Vrenken H,van Straaten EC,Ropele S,Pantoni L,Inzitari D,Barkhof F,Waldemar G,LADIS study group.

    更新日期:2012-04-15 00:00:00

  • STGP: Spatio-temporal Gaussian process models for longitudinal neuroimaging data.

    abstract::Longitudinal neuroimaging data plays an important role in mapping the neural developmental profile of major neuropsychiatric and neurodegenerative disorders and normal brain. The development of such developmental maps is critical for the prevention, diagnosis, and treatment of many brain-related diseases. The aim of t...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2016.04.023

    authors: Hyun JW,Li Y,Huang C,Styner M,Lin W,Zhu H,Alzheimer's Disease Neuroimaging Initiative.

    更新日期:2016-07-01 00:00:00

  • Calibrated fMRI for mapping absolute CMRO2: Practicalities and prospects.

    abstract::Functional magnetic resonance imaging (fMRI) is an essential workhorse of modern neuroscience, providing valuable insight into the functional organisation of the brain. The physiological mechanisms underlying the blood oxygenation level dependent (BOLD) effect are complex and preclude a straightforward interpretation ...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2018.03.068

    authors: Germuska M,Wise RG

    更新日期:2019-02-15 00:00:00

  • High-resolution diffusion MRI at 7T using a three-dimensional multi-slab acquisition.

    abstract::High-resolution diffusion MRI can provide the ability to resolve small brain structures, enabling investigations of detailed white matter architecture. A major challenge for in vivo high-resolution diffusion MRI is the low signal-to-noise ratio. In this work, we combine two highly compatible methods, ultra-high field ...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2016.08.054

    authors: Wu W,Poser BA,Douaud G,Frost R,In MH,Speck O,Koopmans PJ,Miller KL

    更新日期:2016-12-01 00:00:00

  • Neuroplasticity and MRI: A perfect match.

    abstract::Numerous studies have illustrated the benefits of physical workout and cognitive exercise on brain function and structure and, more importantly, on decelerating cognitive decline in old age and promoting functional rehabilitation following injury. Despite these behavioral observations, the exact mechanisms underlying ...

    journal_title:NeuroImage

    pub_type: 杂志文章,评审

    doi:10.1016/j.neuroimage.2015.08.005

    authors: Hamaide J,De Groof G,Van der Linden A

    更新日期:2016-05-01 00:00:00

  • Similarities in the patterns of prefrontal cortex activity during spatial and temporal context memory retrieval after equating for task structure and performance.

    abstract::Event-related functional magnetic resonance imaging was used to assess healthy adults while they performed spatial and temporal context memory tasks matched in task structure. After equating task structure between spatial versus temporal context tasks, subjects reported using similar strategies across tasks and we obs...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2010.09.001

    authors: Crane D,Maillet D,Floden D,Valiquette L,Rajah MN

    更新日期:2011-01-15 00:00:00

  • Microstructure of frontoparietal connections predicts individual resistance to sleep deprivation.

    abstract::Sleep deprivation (SD) can degrade cognitive functioning, but growing evidence suggests that there are large individual differences in the vulnerability to this effect. Some evidence suggests that baseline differences in the responsiveness of a fronto-parietal attention system that is activated during working memory (...

    journal_title:NeuroImage

    pub_type: 杂志文章,随机对照试验

    doi:10.1016/j.neuroimage.2014.11.035

    authors: Cui J,Tkachenko O,Gogel H,Kipman M,Preer LA,Weber M,Divatia SC,Demers LA,Olson EA,Buchholz JL,Bark JS,Rosso IM,Rauch SL,Killgore WD

    更新日期:2015-02-01 00:00:00

  • Synchronization of fronto-parietal beta and theta networks as a signature of visual awareness in neglect.

    abstract::In the neglect syndrome, the perceptual deficit for contra-lesional hemi-space is increasingly viewed as a dysfunction of fronto-parietal cortical networks, the disruption of which has been described in neuroanatomical and hemodynamic studies. Here we exploit the superior temporal resolution of electroencephalography ...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2016.11.013

    authors: Yordanova J,Kolev V,Verleger R,Heide W,Grumbt M,Schürmann M

    更新日期:2017-02-01 00:00:00

  • Magnetic resonance imaging of the Amine-Proton EXchange (APEX) dependent contrast.

    abstract::Chemical exchange between water and labile protons from amino-acids, proteins and other molecules can be exploited to provide tissue contrast with magnetic resonance imaging (MRI) techniques. Using an off-resonance Spin-Locking (SL) scheme for signal preparation is advantageous because the image contrast can be tuned ...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2011.08.014

    authors: Jin T,Wang P,Zong X,Kim SG

    更新日期:2012-01-16 00:00:00

  • Contribution of alcoholism to brain dysmorphology in HIV infection: effects on the ventricles and corpus callosum.

    abstract::Nonrigid registration and atlas-based parcellation methods were used to compare the volume of the ventricular system and the cross-sectional area of the midsagittal corpus callosum on brain MRIs from 272 subjects in four groups: patients with HIV infection, with and without alcoholism comorbidity, alcoholics, and cont...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2006.05.052

    authors: Pfefferbaum A,Rosenbloom MJ,Rohlfing T,Adalsteinsson E,Kemper CA,Deresinski S,Sullivan EV

    更新日期:2006-10-15 00:00:00

  • Intrinsic functional network architecture of human semantic processing: Modules and hubs.

    abstract::Semantic processing entails the activation of widely distributed brain areas across the temporal, parietal, and frontal lobes. To understand the functional structure of this semantic system, we examined its intrinsic functional connectivity pattern using a database of 146 participants. Focusing on areas consistently a...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2016.03.004

    authors: Xu Y,Lin Q,Han Z,He Y,Bi Y

    更新日期:2016-05-15 00:00:00

  • Reduced visual processing capacity in sleep deprived persons.

    abstract::Multiple experiments have found sleep deprivation to lower task-related parietal and extrastriate visual activation, suggesting a reduction of visual processing capacity in this state. The perceptual load theory of attention (Lavie, 1995) predicts that our capacity to process unattended distractors will be reduced by ...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2010.12.057

    authors: Kong D,Soon CS,Chee MW

    更新日期:2011-03-15 00:00:00

  • Brain mechanisms for perceiving illusory lines in humans.

    abstract::Illusory contours (ICs) are perceptions of visual borders despite absent contrast gradients. The psychophysical and neurobiological mechanisms of IC processes have been studied across species and diverse brain imaging/mapping techniques. Nonetheless, debate continues regarding whether IC sensitivity results from a (pr...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2018.07.017

    authors: Anken J,Tivadar RI,Knebel JF,Murray MM

    更新日期:2018-11-01 00:00:00

  • Radial bias is not necessary for orientation decoding.

    abstract::Multivariate pattern analysis can be used to decode the orientation of a viewed grating from fMRI signals in early visual areas. Although some studies have reported identifying multiple sources of the orientation information that make decoding possible, a recent study argued that orientation decoding is only possible ...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2015.11.066

    authors: Pratte MS,Sy JL,Swisher JD,Tong F

    更新日期:2016-02-15 00:00:00

  • Transcranial direct current stimulation over right posterior parietal cortex changes prestimulus alpha oscillation in visual short-term memory task.

    abstract::Alpha band activity changes accompanied with the level attentional state, and recent studies suggest that such oscillation is associated with activities in the posterior parietal cortex. Here we show that artificially elevating parietal activity via positively-charged electric current through the skull can rapidly and...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2014.04.069

    authors: Hsu TY,Tseng P,Liang WK,Cheng SK,Juan CH

    更新日期:2014-09-01 00:00:00

  • Dysfunctional supplementary motor area implication during attention and time estimation tasks in schizophrenia: a PET-O15 water study.

    abstract::Results of this PET-O15 water activation study confirm the implication of supplementary motor areas during time estimation tasks. They also show that the cortical-subcortical network associated with temporal processing is impaired in schizophrenia. Following recent proposals of time dynamic networks, this impairment m...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2004.09.010

    authors: Ortuño FM,Lopez P,Ojeda N,Cervera S

    更新日期:2005-01-15 00:00:00

  • Anatomical and functional parcellation of the human lateral premotor cortex.

    abstract::The lateral premotor cortex (PM) of the macaque monkey is an anatomically multifaceted area, which serves multiple sensorimotor and cognitive functions. While evidence for the functional organization of human premotor cortex accumulates, much less is known about the underlying anatomical properties of this brain regio...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2009.12.069

    authors: Schubotz RI,Anwander A,Knösche TR,von Cramon DY,Tittgemeyer M

    更新日期:2010-04-01 00:00:00

  • Phasic deactivation of the medial temporal lobe enables working memory processing under stress.

    abstract::Demanding cognitive tasks are sometimes carried out under stressful conditions. Several studies indicate that whereas severe stress impairs performance, moderate stress can enhance cognitive performance. In this study, we investigated how moderate stress influences the neural systems supporting working memory. We embe...

    journal_title:NeuroImage

    pub_type: 杂志文章

    doi:10.1016/j.neuroimage.2011.09.027

    authors: Cousijn H,Rijpkema M,Qin S,van Wingen GA,Fernández G

    更新日期:2012-01-16 00:00:00