Evaluation of EPI distortion correction methods for quantitative MRI of the brain at high magnetic field

Hong, Xin; To, Xuan Vinh; Teh, Irvin; Soh, Jian Rui; Chuang, Kai‐Hsiang

doi:10.1016/j.mri.2015.06.010

Cited by 45 publications

(54 citation statements)

References 43 publications

(48 reference statements)

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“…This reference image can then be registered to the T1 image, and the voxelwise displacement map for the forward blip is then saved, so that it can be applied to the EPI timeseries. Although a standard linear registration approach would have possibly yielded similar results at the group level, the nonlinear approach we used leads to better T1/EPI within-subject registration, and has been shown to perform even better than when using fieldmaps (Hong et al, 2015). …”

Section: Methodsmentioning

confidence: 97%

Threat of shock increases excitability and connectivity of the intraparietal sulcus

Balderston

Hale

Hsiung

et al. 2017

eLife

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Anxiety disorders affect approximately 1 in 5 (18%) Americans within a given 1 year period, placing a substantial burden on the national health care system. Therefore, there is a critical need to understand the neural mechanisms mediating anxiety symptoms. We used unbiased, multimodal, data-driven, whole-brain measures of neural activity (magnetoencephalography) and connectivity (fMRI) to identify the regions of the brain that contribute most prominently to sustained anxiety. We report that a single brain region, the intraparietal sulcus (IPS), shows both elevated neural activity and global brain connectivity during threat. The IPS plays a key role in attention orienting and may contribute to the hypervigilance that is a common symptom of pathological anxiety. Hyperactivation of this region during elevated state anxiety may account for the paradoxical facilitation of performance on tasks that require an external focus of attention, and impairment of performance on tasks that require an internal focus of attention.DOI: http://dx.doi.org/10.7554/eLife.23608.001

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Section: Methodsmentioning

confidence: 97%

Threat of shock increases excitability and connectivity of the intraparietal sulcus

Balderston

Hale

Hsiung

et al. 2017

eLife

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“…A whole body volume coil was used for transmission and a mouse brain surface coil was placed on top of the head for receiving. Paired control and label images were acquired in an interleaved fashion with a train of Hanning window-shaped radiofrequency pulses of duration/spacing = 200/200 μs, flip angle = 25° and slice-selective gradient = 9 mT/m, and a labeling duration = 2100 ms [68]. The images were acquired by 2D multi-slice spin-echo echo planner imaging with FOV =18 x18 mm 2 , matrix =128 × 128, slice thickness = 1 mm, 10 slices, TR = 4,000 ms, TE = 35 ms, and 120 repetitions.…”

Section: Methodsmentioning

confidence: 99%

Caloric restriction preserves memory and reduces anxiety of aging mice with early enhancement of neurovascular functions

Parikh

Guo

Chuang

et al. 2016

Aging

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“…In humans, the resulting signal dropout and distortion are sometimes mitigated by corrections based on phase mapping or on active shimming strategies (Gu et al, 2002; Tang and Huang, 2011). Some of these techniques are beginning to be applied to animal studies as well (Hong et al, 2015) but they are not yet widely available. Strong higher order shims are particularly helpful to minimize distortion when whole brain imaging is needed (Keilholz et al, 2006, 2004).…”

Section: Image and Time Course Noisementioning

confidence: 99%

Noise and non-neuronal contributions to the BOLD signal: applications to and insights from animal studies

et al. 2017

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The BOLD signal reflects hemodynamic events within the brain, which in turn are driven by metabolic changes and neural activity. However, the link between BOLD changes and neural activity is indirect and can be influenced by a number of non-neuronal processes. Motion and physiological cycles have long been known to affect the BOLD signal and are present in both humans and animal models. Differences in physiological baseline can also contribute to intra- and inter-subject variability. The use of anesthesia, common in animal studies, alters neural activity, vascular tone, and neurovascular coupling. Most intriguing, perhaps, are the contributions from other processes that do not appear to be neural in origin but which may provide information about other aspects of neurophysiology. This review discusses different types of noise and non-neuronal contributors to the BOLD signal, sources of variability for animal studies, and insights to be gained from animal models.

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Evaluation of EPI distortion correction methods for quantitative MRI of the brain at high magnetic field

Cited by 45 publications

References 43 publications

Threat of shock increases excitability and connectivity of the intraparietal sulcus

Threat of shock increases excitability and connectivity of the intraparietal sulcus

Caloric restriction preserves memory and reduces anxiety of aging mice with early enhancement of neurovascular functions

Noise and non-neuronal contributions to the BOLD signal: applications to and insights from animal studies

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