Filters








507 Hits in 5.4 sec

Investigating the oxygenation of brain arteriovenous malformations using quantitative susceptibility mapping

Emma Biondetti, Alvaro Rojas-Villabona, Magdalena Sokolska, Francesca B. Pizzini, Hans Rolf Jäger, David L. Thomas, Karin Shmueli
2019 NeuroImage  
By exploiting the paramagnetic properties of deoxygenated hemoglobin in venous blood using magnetic resonance imaging (MRI) quantitative susceptibility mapping (QSM), we aimed to explore venous density  ...  Brain arteriovenous malformations (AVMs) are congenital vascular anomalies characterized by arteriovenous shunting through a network of coiled and tortuous vessels.  ...  Discussion This study aimed to evaluate the appearance of arteriovenous malformations (AVMs) on MRIderived quantitative susceptibility ( ) maps, and compare venous vascularization and oxygenation in the  ... 
doi:10.1016/j.neuroimage.2019.05.014 pmid:31075392 fatcat:mnrxgkjifngpxfy5vfhq4sadw4

Impaired peri-nidal cerebrovascular reserve in seizure patients with brain arteriovenous malformations

Jorn Fierstra, John Conklin, Timo Krings, Marat Slessarev, Jay S. Han, Joseph A. Fisher, Karel terBrugge, M. Christopher Wallace, Michael Tymianski, David J. Mikulis
2010 Brain  
Quantitative measurements of cerebrovascular reactivity using blood oxygen level-dependent MRI appear to correlate with seizure susceptibility in patients with brain arteriovenous malformation.  ...  We used magnetic resonance imaging-based quantitative cerebrovascular reactivity mapping and conventional angiography to determine whether seizure-prone patients with brain arteriovenous malformations  ...  Funding This work was supported by the Chair fund of the Neurovascular Therapeutics Programme from the University Health Network of Toronto and by the Ontario Research Fund (RE02-002).  ... 
doi:10.1093/brain/awq286 pmid:21109501 fatcat:hrbbxe5skvfsrnfdl3giezwh4u

Relationship between Abnormal Hyperintensity on T2-Weighted Images Around Developmental Venous Anomalies and Magnetic Susceptibility of Their Collecting Veins: In-Vivo Quantitative Susceptibility Mapping Study

Yangsean Choi, Jinhee Jang, Yoonho Nam, Na-Young Shin, Hyun Seok Choi, So-Lyung Jung, Kook-Jin Ahn, Bum-soo Kim
2019 Korean Journal of Radiology  
Conflicts of Interest The authors have no potential conflicts of interest to disclose. ORCID iDs  ...  Recently, a method was proposed to quantitatively estimate the oxygenation status of a structure of interest using phase information from MR images and the quantitative susceptibility mapping (QSM) measurement  ...  They did not quantify phase kjronline.org or susceptibility values of DVA, and their methods did not allow quantitative investigation of the association between venous congestion and regional oxygen metabolism  ... 
doi:10.3348/kjr.2018.0685 fatcat:4fhmky3mxvbxlavil34bljaz6y

Snapshot MR Technique to Measure OEF Using Rapid Frequency Mapping

Rajiv G Menon, Edward G Walsh, Donald B Twieg, Charles G Cantrell, Parmede Vakil, Sumeeth V Jonathan, Hunt H Batjer, Timothy J Carroll
2014 Journal of Cerebral Blood Flow and Metabolism  
Magnetic resonance (MR)-based oxygen extraction fraction (OEF) measurement techniques that use blood oxygen level-dependent (BOLD)-based approaches require the measurement of the R 2 ' decay rate and deoxygenated  ...  The Parameter Assessment by Retrieval from Signal Encoding (PARSE) technique was used to acquire the local frequency change maps.  ...  ACKNOWLEDGMENTS The authors would like to acknowledge the following funding sources for this research: NIH/NHLBI R01 HL088437; NIH/NINDS R01 NS049395-01A2; NIH/NIBIB T32 EB005170.  ... 
doi:10.1038/jcbfm.2014.59 pmid:24756077 pmcid:PMC4083374 fatcat:mkw5xxwuwrcljgqkvkyquisssy

Susceptibility-Based Neuroimaging: Standard Methods, Clinical Applications, and Future Directions

Salil Soman, Jose A. Bregni, Berkin Bilgic, Ursula Nemec, Audrey P. Fan, Zhe Liu, Robert L. Barry, Jiang Du, Keith Main, Jerome Yesavage, Maheen M. Adamson, Michael Moseley (+1 others)
2017 Current Radiology Reports  
The evaluation of neuropathologies using MRI methods that leverage tissue susceptibility have become standard practice, especially to detect blood products or mineralization.  ...  Additionally, emerging MRI techniques have the ability to provide new information based on tissue susceptibility properties in a robust and quantitative manner.  ...  The whole brain maps of susceptibility produced, with CSF used as water reference susceptibility, susceptibility shifts and thus OEF can be measured along all vessels to create "quantitative oxygenation  ... 
doi:10.1007/s40134-017-0204-1 pmid:28695062 pmcid:PMC5501163 fatcat:7gswd5n56nfnrmsjqwrtfucf74

Susceptibility-weighted imaging and quantitative susceptibility mapping in the brain

Chunlei Liu, Wei Li, Karen A. Tong, Kristen W. Yeom, Samuel Kuzminski
2014 Journal of Magnetic Resonance Imaging  
This limitation is currently being addressed with the development of quantitative susceptibility mapping (QSM) and susceptibility tensor imaging (STI).  ...  This limitation is being addressed with the recent development of quantitative susceptibility mapping (QSM) (4-34) and susceptibility tensor imaging (STI) (18, (35) (36) (37) (38) (39) (40) (41) (42) (  ...  Applications of Susceptibility Mapping Although the diagnostic value of QSM still needs to be fully investigated, the quantitative information has already shed additional light on brain development, aging  ... 
doi:10.1002/jmri.24768 pmid:25270052 pmcid:PMC4406874 fatcat:gyq5hcecdrf4dnujswgqtgmicm

Functional evaluation of arteriovenous malformations

Nicholas C. Bambakidis, Jeffrey L. Sunshine, Peter F. Faulhaber, Rober W. Tarr, Warren R. Selman, Robert A. Ratcheson
2001 Neurosurgical Focus  
The oxygenated blood in turn is seen as increased signal change on MR imaging sequences with appropriate sensitivity to susceptibility effects of the free electrons on oxyhemoglobin.  ...  Cerebral blood flow estimations rely on water labeled with radioactive oxygen, and it is the combination of CBF and regional CMRglu metabolism data that provide the best quantitation of cortical neuronal  ... 
doi:10.3171/foc.2001.11.5.3 pmid:16466234 fatcat:uowflmevszddbgl7jflgcxauqa

Clinical Challenges of fMRI [chapter]

Nader Pouratian, Susan Y. Bookheimer
2010 BOLD fMRI  
These disruption-based techniques of mapping the brain have emerged as the gold standard of clinical brain mapping, especially in the neurosurgical arena.  ...  NIRS), 6 our understanding of the functional organization of the brain largely stemmed from studying the effects of brain lesions.  ...  Human interpretation of mapping signals, when not quantitative, is always susceptible to bias.  ... 
doi:10.1007/978-1-4419-1329-6_5 fatcat:ntij6r7q5jge5k7uokh233jlke

Longitudinal advanced MRI case report of white matter radiation necrosis

Vanessa Wiggermann, Emmanuelle Lapointe, Ludmila Litvin, Carina Graf, Enedino Hernández‐Torres, Michael McKenzie, Irene M. Vavasour, Cornelia Laule, Erin L. MacMillan, David K. B. Li, Shannon H. Kolind, Alexander Rauscher (+1 others)
2018 Annals of Clinical and Translational Neurology  
We used magnetic resonance imaging to study radiation-induced necrosis of atypical onset, severity, and extent following stereotactic radiosurgery for a symptomatic arteriovenous malformation.  ...  An autoimmune response to brain antigens could underlie white matter changes outside the initial radiation field.  ...  Introduction Arteriovenous malformations (AVMs) are infrequent but can lead to severe neurological deficits if bleeding occurs.  ... 
doi:10.1002/acn3.704 pmid:30847370 pmcid:PMC6389755 fatcat:bhvgpi7omrh4jdhxlx5ffnzwzi

A neuroradiologist's guide to arterial spin labeling MRI in clinical practice

M. Grade, J. A. Hernandez Tamames, F. B. Pizzini, E. Achten, X. Golay, M. Smits
2015 Neuroradiology  
ASL has potential for the detection and follow-up of arteriovenous malformations. In the workup of dementia patients, ASL is proposed as a diagnostic alternative to PET.  ...  Major advantages of ASL for brain tumour imaging are the fact that CBF measurements are not influenced by breakdown of the blood-brain barrier, as well as its quantitative nature, facilitating multicentre  ...  Acknowledgments This study is supported by the EU COST Action  ... 
doi:10.1007/s00234-015-1571-z pmid:26351201 pmcid:PMC4648972 fatcat:wbmxvor3pzdpjgs2jwh3z5c2ru

Diagnostic value of alternative techniques to gadolinium-based contrast agents in MR neuroimaging—a comprehensive overview

Anna Falk Delgado, Danielle Van Westen, Markus Nilsson, Linda Knutsson, Pia C. Sundgren, Elna-Marie Larsson, Alberto Falk Delgado
2019 Insights into Imaging  
These specific diseases include primary brain tumors, metastases, abscess, multiple sclerosis, and vascular conditions such as aneurysm, arteriovenous malformation, arteriovenous fistula, intracranial  ...  Some linear GBCAs were restricted from use by the European Medicines Agency (EMA) in 2017.This review focuses on non-contrast-enhanced MRI techniques that can serve as alternatives for the use of GBCAs  ...  Although it may be feasible to exclude the use of GBCA without limiting the ability to detect primary ASL arterial spin labeling, AUC area under curve, AV arteriovenous, AVM arteriovenous malformation,  ... 
doi:10.1186/s13244-019-0771-1 pmid:31444580 pmcid:PMC6708018 fatcat:tfepauojlba65eb46y34e2idz4

Toward normal perfusion after radiosurgery: perfusion MR Imaging with independent component analysis of brain arteriovenous malformations

Wan-Yuo Guo, Yu-Te Wu, Hsiu-Mei Wu, Wen-Yuh Chung, Yi-Hsuan Kao, Tzu-Chen Yeh, Cheng-Ying Shiau, D Hung-Chi Pan, Yue-Cune Chang, Jen-Chuen Hsieh
2004 American Journal of Neuroradiology  
Brain perfusion is disturbed by cerebral arteriovenous malformations (AVMs). Our study was conducted to determine the radiosurgical effects on this disturbed perfusion.  ...  Regions of interest (ROIs) on AVM target sections were defined as follows: N, AVM nidus; H, the rest of the ipsilateral hemisphere; P, immediately posterior to the nidus; A, immediately anterior to the  ...  The in-plane arterial input function was used for perfusion mapping of the brain tissues from DSC-MR imaging on a voxel-by-voxel basis (9) .  ... 
pmid:15569724 pmcid:PMC8148722 fatcat:l7wrmtnscvfpxpbz6luaxidzn4

Arterial Spin-Labeling in Routine Clinical Practice, Part 2: Hypoperfusion Patterns

A.R. Deibler, J.M. Pollock, R.A. Kraft, H. Tan, J.H. Burdette, J.A. Maldjian
2008 American Journal of Neuroradiology  
During a period of 1 year, more than 3000 pulsed ASL procedures were performed as a component of routine clinical brain MR imaging evaluation at both 1.5 and 3T.  ...  The objective of this review article is to illustrate our experience with a heterogeneous collection of ASL perfusion cases and describe patterns of hypoperfusion.  ...  Arteriovenous malformations (AVM) characteristically show marked hyperperfusion on PASL.  ... 
doi:10.3174/ajnr.a1033 pmid:18356467 pmcid:PMC3397388 fatcat:o6agx7pcgrhj3odgsfr3bycnoa

The Imaging of Localization Related Symptomatic Epilepsies: The Value of Arterial Spin Labelling Based Magnetic Resonance Perfusion

Chinmay Nagesh, Savith Kumar, Ramshekhar Menon, Bejoy Thomas, Ashalatha Radhakrishnan, Chandrasekharan Kesavadas
2018 Korean Journal of Radiology  
Subtracting a paired set of 'labelled' and unlabelled 'control' images will yield parametric maps of absolute cerebral blood flow (CBF) that may be used for qualitative and quantitative evaluation.  ...  Arterial spin labelling allows characterization of both vascular malformation and its secondary effects on the brain parenchyma.  ... 
doi:10.3348/kjr.2018.19.5.965 pmid:30174487 pmcid:PMC6082755 fatcat:jeoskexa2rbgnpdmnvtaojytcu

Pseudo Continuous Arterial Spin Labeling MR Imaging of Status Epilepticus

Minkyung Yi, Seung Hong Choi, Keun-Hwa Jung, Tae Jin Yoon, Ji-Hoon Kim, Chul-Ho Sohn, Kee-Hyun Chang
2012 Journal of the Korean Society of Magnetic Resonance in Medicine  
Arteriovenous malformation was identified in the left medial temporo-occipital lobe of patient 2 on angiograms (Fig. 3) .  ...  Thus, we believe that the further study using a quantitative analysis based on whole-brain voxel data from case control study is also warranted to validate our results.  ... 
doi:10.13104/jksmrm.2012.16.2.142 fatcat:zusqxluhxneoxor3dlrjx6vpli
« Previous Showing results 1 — 15 out of 507 results