scholarly journals Spiral-in/out BOLD fMRI for increased SNR and reduced susceptibility artifacts

2001 ◽  
Vol 46 (3) ◽  
pp. 515-522 ◽  
Author(s):  
Gary H. Glover ◽  
Christine S. Law
Keyword(s):  
Susceptibility Artifacts ◽  
Bold Fmri

Reduced susceptibility artifacts in BOLD fMRI using localized shimming

NeuroImage ◽  
2000 ◽  
Vol 11 (5) ◽  
pp. S553 ◽  
Author(s):  
Hui Mao ◽  
Srinivas Kidambi
Keyword(s):  
Susceptibility Artifacts ◽  
Bold Fmri

scholarly journals Functional Activities Detected in the Olfactory Bulb and Associated Olfactory Regions in the Human Brain Using T2-Prepared BOLD Functional MRI at 7T

2021 ◽  
Vol 15 ◽  
Author(s):  
Xinyuan Miao ◽  
Adrian G. Paez ◽  
Suraj Rajan ◽  
Di Cao ◽  
Dapeng Liu ◽  
...  
Keyword(s):  
Olfactory Bulb ◽  
Orbitofrontal Cortex ◽  
Brain Regions ◽  
Vital Role ◽  
Blood Oxygenation ◽  
Olfactory Stimulation ◽  
Planar Imaging ◽  
Susceptibility Artifacts ◽  
Bold Fmri ◽  
Susceptibility Effects

Olfaction is a fundamental sense that plays a vital role in daily life in humans, and can be altered in neuropsychiatric and neurodegenerative diseases. Blood oxygenation level-dependent (BOLD) functional magnetic resonance imaging (fMRI) using conventional echo-planar-imaging (EPI) based sequences can be challenging in brain regions important for olfactory processing, such as the olfactory bulb (OB) and orbitofrontal cortex, mainly due to the signal dropout and distortion artifacts caused by large susceptibility effects from the sinonasal cavity and temporal bone. To date, few studies have demonstrated successful fMRI in the OB in humans. T2-prepared (T2prep) BOLD fMRI is an alternative approach developed especially for performing fMRI in regions affected by large susceptibility artifacts. The purpose of this technical study is to evaluate T2prep BOLD fMRI for olfactory functional experiments in humans. Olfactory fMRI scans were performed on 7T in 14 healthy participants. T2prep BOLD showed greater sensitivity than GRE EPI BOLD in the OB, orbitofrontal cortex and the temporal pole. Functional activation was detected using T2prep BOLD in the OB and associated olfactory regions. Habituation effects and a bi-phasic pattern of fMRI signal changes during olfactory stimulation were observed in all regions. Both positively and negatively activated regions were observed during olfactory stimulation. These signal characteristics are generally consistent with literature and showed a good intra-subject reproducibility comparable to previous human BOLD fMRI studies. In conclusion, the methodology demonstrated in this study holds promise for future olfactory fMRI studies in the OB and other brain regions that suffer from large susceptibility artifacts.

scholarly journals Sensitivity-encoded single-shot spiral imaging for reduced susceptibility artifacts in BOLD fMRI

2002 ◽  
Vol 48 (5) ◽  
pp. 860-866 ◽  
Author(s):  
Markus Weiger ◽  
Klaas P. Pruessmann ◽  
Robert Österbauer ◽  
Peter Börnert ◽  
Peter Boesiger ◽  
...  
Keyword(s):  
Single Shot ◽  
Spiral Imaging ◽  
Susceptibility Artifacts ◽  
Bold Fmri

The Effects of CCRC on Cognition and Brain Activity in aMCI Patients: A Pilot Placebo Controlled BOLD fMRI Study

2014 ◽  
Vol 11 (5) ◽  
pp. 484-493 ◽  
Author(s):  
Junying Zhang ◽  
Zijing Wang ◽  
Shijun Xu ◽  
Yaojing Chen ◽  
Kewei Chen ◽  
...  
Keyword(s):  
Brain Activity ◽  
Bold Fmri ◽  
Fmri Study

Evidences of Brain Plasticity and Motor Control Modulation after Hemodialysis Session by Helixone Membrane: BOLD-fMRI Study

2020 ◽  
Vol 19 (6) ◽  
pp. 466-477
Author(s):  
Saïd Boujraf ◽  
Rachida Belaïch ◽  
Abdelkhalek Housni ◽  
Badreeddine Alami ◽  
Tariq Skalli ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Functional Activity ◽  
Brain Plasticity ◽  
Biological Assessment ◽  
Bold Fmri ◽  
Before And After ◽  
Total Antioxidant ◽  
Inflammatory State ◽  
Functional Control ◽  
The Impact

Objective: The aim of this paper is to demonstrate the impact of hemodialysis (HD) using synthetic Helixone membrane on brain functional control reorganization and plasticity in the cortical area generated while Oxidative Stress (OS) would be the main impacting agent. Methods: Indeed, 9 chronic HD patients underwent identical brain BOLD-fMRI assessment using the motor paradigm immediately before and after the same HD sessions. To assess the oxidative stress, the same patients underwent biological-assessment, including Malondialdehyde (MDA) and Total- Antioxidant-Activity (TAOA) reported in earlier papers. Results: BOLD-fMRI maps of motor areas obtained from HD-patients before and after HD sessions revealed a significant enhancement of activation volume of the studied motor cortex after HD reflecting brain plasticity. Results were correlated with OS assessed by the measurement of MDA and TAOA; this correlation was close to 1. Conclusion: Indeed, HD enhances the inflammatory state of brain tissues reflected by the increased OS. The functional brain reaction demonstrated a functional activity reorganization to overcome the inflammatory state and OS enhanced by HD process. This functional activity reorganization reveals brain plasticity induced by OS originated by HD.

Spatial correlation of bold fMRI and electrocortical stimulation mapping

NeuroImage ◽  
2001 ◽  
Vol 13 (6) ◽  
pp. 224
Author(s):  
Nader Pouratian ◽  
Susan Y. Bookheimer ◽  
Neil A. Martin ◽  
David E. Rex ◽  
Andrew F. Cannestra ◽  
...  
Keyword(s):  
Spatial Correlation ◽  
Bold Fmri

scholarly journals Pictorial essay: How co-registered BOLD fMRI and DTI data can improve diffusion tensor tractography

2021 ◽  
pp. 101258
Author(s):  
Bojan D. Petrovic ◽  
Doug Burman ◽  
Shakeel Chowdhry ◽  
Julian E. Bailes ◽  
Joel Meyer
Keyword(s):  
Diffusion Tensor ◽  
Diffusion Tensor Tractography ◽  
Bold Fmri ◽  
Pictorial Essay

scholarly journals Novel in vivo depiction of optic nerves hemorrhages in child abuse: a 3D-SWI pilot study

2021 ◽  
Author(s):  
Giulio Zuccoli
Keyword(s):  
Optic Nerve ◽  
Mass Effect ◽  
Abusive Head Trauma ◽  
Superficial Siderosis ◽  
Susceptibility Artifacts ◽  
Female Ratio ◽  
Optic Nerves ◽  
Statistical Correlations ◽  
Post Traumatic

Abstract Purpose Until now, the diagnosis of optic nerves hemorrhages in abusive head trauma (AHT) has been obtained only in the postmortem setting. The aim of the IRB-approved study was to assess the presence of optic nerves hemorrhages in AHT patients using 3D-SWI. Methods Thirteen children with a final confirmed multidisciplinary diagnosis of AHT underwent coronal and axial 3D-SWI imaging of the orbits. The presence of optic nerve sheath (ONS) hemorrhages was defined by thickening and marked 3D-SWI hypointensity of the ONS, resulting in mass effect upon the CSF space. Optic nerve (ON) hemorrhages were defined by areas of susceptibility artifacts in the ON parenchyma. Superficial siderosis was defined by susceptibility artifact coating the ON. Furthermore, data about post-traumatic deformity of the ONS at the head of the optic nerve were collected. Results The average age of the population was 7.9 ± 5.9 months old. The average GCS was 11.8 ± 4.5. The male to female ratio was 7:6. ONS hemorrhages were identified in 69.2% of cases. Superficial siderosis and ON hemorrhages were identified in 38.5 and 76.9% of cases, respectively. 3D-SWI also depicted traumatic deformity of the ONS at the level of the optic nerve head in 10 cases (76.9%). No statistical correlations were identified between RetCam findings and 3D-SWI findings or GCS and ON hemorrhages. Conclusion This research shows that dedicated MRI with volumetric SWI of the orbits can depict hemorrhages in the ON, ONS, and ONS injury, in AHT victims.

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