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'Brain perfusion'

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https://www.readbyqxmd.com/read/28198576/a-constrained-slice-dependent-background-suppression-scheme-for-simultaneous-multislice-pseudo-continuous-arterial-spin-labeling
#1
Xingfeng Shao, Yi Wang, Steen Moeller, Danny J J Wang
PURPOSE: To present a constrained slice-dependent (CSD) background-suppression (BS) scheme in 2D arterial spin labeling (ASL) using simultaneous multislice acquisition with blipped-CAIPIRINHA (controlled aliasing in parallel imaging results in higher acceleration). METHODS: Background suppression for 2D acquisition is challenging because of the multiple nulling points required for sequential slice readout. Constrained slice-dependent BS exploits the simultaneous multislice technique to reduce the readout duration, and uses slice-dependent premodulation pulses to achieve BS across slice groups...
February 15, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28190492/regional-cerebral-blood-flow-assessed-by-single-photon-emission-computed-tomography-spect-in-dogs-with-congenital-portosystemic-shunt-and-hepatic-encephalopathy
#2
Matan Or, Kathelijne Peremans, Valentine Martlé, Eva Vandermeulen, Tim Bosmans, Nausikaa Devriendt, Hilde de Rooster
Regional cerebral blood flow (rCBF) in eight dogs with congenital portosystemic shunt (PSS) and hepatic encephalopathy (HE) was compared with rCBF in eight healthy control dogs using single photon emission computed tomography (SPECT) with a (99m)technetium-hexamethylpropylene amine oxime ((99m)Tc-HMPAO) tracer. SPECT scans were abnormal in all PSS dogs. Compared to the control group, rCBF in PSS dogs was significantly decreased in the temporal lobes and increased in the subcortical (thalamic and striatal) area...
February 2017: Veterinary Journal
https://www.readbyqxmd.com/read/28187964/brain-perfusion-and-diffusion-abnormalities-in-children-treated-for-posterior-fossa-brain-tumors
#3
Matthew D Li, Nils D Forkert, Palak Kundu, Cheryl Ambler, Robert M Lober, Terry C Burns, Patrick D Barnes, Iris C Gibbs, Gerald A Grant, Paul G Fisher, Samuel H Cheshier, Cynthia J Campen, Michelle Monje, Kristen W Yeom
OBJECTIVE: To compare cerebral perfusion and diffusion in survivors of childhood posterior fossa brain tumor with neurologically normal controls and correlate differences with cognitive dysfunction. STUDY DESIGN: We analyzed retrospectively arterial spin-labeled cerebral blood flow (CBF) and apparent diffusion coefficient (ADC) in 21 patients with medulloblastoma (MB), 18 patients with pilocytic astrocytoma (PA), and 64 neurologically normal children. We generated ANCOVA models to evaluate treatment effects on the cerebral cortex, thalamus, caudate, putamen, globus pallidus, hippocampus, amygdala, nucleus accumbens, and cerebral white matter at time points an average of 5...
February 7, 2017: Journal of Pediatrics
https://www.readbyqxmd.com/read/28187797/airway-management-and-mechanical-ventilation-in-acute-brain-injury
#4
D B Seder, J Bösel
Patients with acute neurologic disease often develop respiratory failure, the management of which profoundly affects brain physiology and long-term functional outcomes. This chapter reviews airway management and mechanical ventilation of patients with acute brain injury, offering practical strategies to optimize treatment of respiratory failure and minimize secondary brain injury. Specific concerns that are addressed include physiologic changes during intubation and ventilation such as the effects on intracranial pressure and brain perfusion; cervical spine management during endotracheal intubation; the role of tracheostomy; and how ventilation and oxygenation are utilized to minimize ischemia-reperfusion injury and cerebral metabolic distress...
2017: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/28183839/mr-imaging-of-individual-perfusion-reorganization-using-superselective-pseudocontinuous-arterial-spin-labeling-in-patients-with-complex-extracranial-steno-occlusive-disease
#5
V Richter, M Helle, M J P van Osch, T Lindner, A S Gersing, P Tsantilas, H-H Eckstein, C Preibisch, C Zimmer
BACKGROUND AND PURPOSE: Patients with multiple stenoses or occlusions of the extracranial arteries require an individualized diagnostic approach. We evaluated the feasibility and clinical utility of a novel MR imaging technique for regional perfusion imaging in this patient group. MATERIALS AND METHODS: Superselective pseudocontinuous arterial spin-labeling with a circular labeling spot enabling selective vessel labeling was added to routine imaging in a prospective pilot study in 50 patients (10 women, 70...
February 9, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28177301/tracking-short-term-biodistribution-and-long-term-clearance-of-spio-tracers-in-magnetic-particle-imaging
#6
Paul Keselman, Elaine Yu, Xinyi Zhou, Patrick Goodwill, Prashant Chandrasekharan, R Matthew Ferguson, Amit Khandhar, Scott Kemp, Kannan Krishnan, Bo Zheng, Steven Conolly
Magnetic Particle Imaging (MPI) is an emerging tracer-based medical imaging modality that images non-radioactive, kidney-safe superparamagnetic iron oxide (SPIO) tracers. MPI offers quantitative, high-contrast and high-SNR images, so MPI has exceptional promise for applications such as cell tracking, angiography, brain perfusion, cancer detection, traumatic brain injury and pulmonary imaging. In assessing MPI's utility for applications mentioned above, it is important to be able to assess tracer short-term biodistribution as well as long-term clearance from the body...
February 8, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28159217/macro-and-microelements-in-the-rat-liver-kidneys-and-brain-tissues-sex-differences-and-effect-of-blood-removal-by-perfusion-in-vivo
#7
Tatjana Orct, Jasna Jurasović, Vedran Micek, Dean Karaica, Ivan Sabolić
Concentrations of macro- and microelements in animal organs indicate the animal health status and represent reference data for animal experiments. Their levels in blood and tissues could be different between sexes, and could be different with and without blood in tissues. To test these hypotheses, in adult female and male rats the concentrations of various elements were measured in whole blood, blood plasma, and tissues from blood-containing (nonperfused) and blood-free liver, kidneys, and brain (perfused in vivo with an elements-free buffer)...
March 2017: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/28154905/changes-in-dorsolateral-prefrontal-connectivity-after-rtms-in-treatment-resistant-depression-a-brain-perfusion-spect-study
#8
Raphaëlle Richieri, Damien Jouvenoz, Antoine Verger, Patrick Fiat, Laurent Boyer, Christophe Lançon, Eric Guedj
PURPOSE: Repetitive transcranial magnetic stimulation (rTMS) is a non-invasive and safe alternative to electroconvulsive therapy for treatment-resistant depression (TRD). After rTMS, changes in brain SPECT perfusion have been remotely identified within medial temporal limbic areas, while no local effects have been found within the left dorsolateral prefrontal cortex (DLPFC)-i.e. under the coil. Functional changes in connectivity may underlie these remote effects. Interestingly, functional connectivity has been recently investigated using perfusion SPECT, and abnormalities identified in TRD patients...
February 3, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28130808/the-usefulness-of-combined-brain-perfusion-single-photon-emission-computed-tomography-dopamine-transporter-single-photon-emission-computed-tomography-and-123-i-metaiodobenzylguanidine-myocardial-scintigraphy-for-the-diagnosis-of-dementia-with-lewy-bodies
#9
Seiju Kobayashi, Kanae Makino, Shigeki Hatakeyama, Takao Ishii, Masaru Tateno, Tomo Iwamoto, Hanako Tsujino, Kazuhito Kawasaki, Kouhei Mikuni, Wataru Ukai, Tomonori Murayama, Eri Hashimoto, Kumiko Utsumi, Chiaki Kawanishi
BACKGROUND: Current diagnostic criteria recommend neuroimaging as a diagnostic support tool for the clinical diagnosis of dementia with Lewy bodies (DLB). Because DLB causes characteristic impairments and disabilities, such as neuroleptic hypersensitivity, which may significantly increase morbidity and mortality, its prompt and correct diagnosis is very important. The aim of this study was to evaluate the extent to which diagnostic accuracy can be increased by using different combinations of brain perfusion single-photon emission computed tomography (bp-SPECT), (123) I-metaiodobenzylguanidine myocardial scintigraphy (MIBG scintigraphy), and DAT-SPECT...
January 28, 2017: Psychogeriatrics: the Official Journal of the Japanese Psychogeriatric Society
https://www.readbyqxmd.com/read/28108645/whole-body-hyperthermia-but-not-skin-hyperthermia-accelerates-brain-and-locomotor-limb-circulatory-strain-and-impairs-exercise-capacity-in-humans
#10
Steven J Trangmar, Scott T Chiesa, Kameljit K Kalsi, Niels H Secher, José González-Alonso
Cardiovascular strain and hyperthermia are thought to be important factors limiting exercise capacity in heat-stressed humans, however, the contribution of elevations in skin (Tsk) versus whole body temperatures on exercise capacity has not been characterized. To ascertain their relationships with exercise capacity, blood temperature (TB), oxygen uptake (V̇O2), brain perfusion (MCA Vmean), locomotor limb hemodynamics, and hematological parameters were assessed during incremental cycling exercise with elevated skin (mild hyperthermia; HYPmild), combined core and skin temperatures (moderate hyperthermia; HYPmod), and under control conditions...
January 2017: Physiological Reports
https://www.readbyqxmd.com/read/28108567/role-of-the-frozen-elephant-trunk-procedure-for-chronic-aortic-dissection
#11
Eric E Roselli, Faisal G Bakaeen, Douglas R Johnston, Edward G Soltesz, Michael Z Tong
OBJECTIVES: Considering the chronic and progressive nature of aortic dissection, operative planning must anticipate the need for later interventions. We have increasingly used a modified version of the frozen elephant trunk repair operation to treat these patients. We review the indications, considerations for planning, and important operative details for performing frozen elephant trunk repair for chronic aortic dissection. METHODS: Frozen elephant trunk repair is performed using selective antegrade brain perfusion, direct placement of commercially available stent grafts with suture fixation in the aortic arch, and proximal aortic replacement...
January 2017: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/28050719/sudden-benzodiazepine-induced-resolution-of-post-operative-pediatric-cerebellar-mutism-syndrome-a-clinical-spect-study
#12
Francesco Nicita, Milena Paiano, Mauro Liberatore, Alberto Spalice, Paola Papoff, Mariacristina Ullo, Manolo Piccirilli, Anna Clerico, Amalia Schiavetti
Post-operative pediatric cerebellar mutism syndrome (PPCMS) is a clinical syndrome arising from cerebellar injury and characterized by absence of speech and other possible symptoms and signs. Rare reports described some benefit after administration of dopamine agonist therapy, but no treatment has proven efficacy. In this paper, we report on the dramatic, sudden resolution of PPCMS induced by midazolam administration in a boy who underwent posterior fossa surgery for choroid plexus papilloma of the fourth ventricle...
March 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28048545/we-de-207a-04-advances-in-radiological-neuro-endovascular-interventional-imaging
#13
S Rudin
: 1. Parallels in the evolution of x-ray angiographic systems and devices used for minimally invasive endovascular therapy Charles Strother - DSA, invented by Dr. Charles Mistretta at UW-Madison, was the technology which enabled the development of minimally invasive endovascular procedures. As DSA became widely available and the potential benefits for accessing the cerebral vasculature from an endovascular approach began to be apparent, industry began efforts to develop tools for use in these procedures...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048454/we-de-207a-00-advances-in-image-guided-neurointerventions-clinical-pull-and-technology-push
#14
Jeffrey Siewerdsen, Rebecca Fahrig
: 1. Parallels in the evolution of x-ray angiographic systems and devices used for minimally invasive endovascular therapy Charles Strother - DSA, invented by Dr. Charles Mistretta at UW-Madison, was the technology which enabled the development of minimally invasive endovascular procedures. As DSA became widely available and the potential benefits for accessing the cerebral vasculature from an endovascular approach began to be apparent, industry began efforts to develop tools for use in these procedures...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047800/we-de-207a-01-parallels-in-the-evolution-of-x-ray-angiographic-systems-and-devices-used-for-minimally-invasive-endovascular-therapy
#15
C Strother
: 1. Parallels in the evolution of x-ray angiographic systems and devices used for minimally invasive endovascular therapy Charles Strother - DSA, invented by Dr. Charles Mistretta at UW-Madison, was the technology which enabled the development of minimally invasive endovascular procedures. As DSA became widely available and the potential benefits for accessing the cerebral vasculature from an endovascular approach began to be apparent, industry began efforts to develop tools for use in these procedures...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047144/we-de-207a-02-advances-in-cone-beam-ct-anatomical-and-functional-imaging-in-angio-suite-to-enable-one-stop-shop-stroke-imaging-workflow
#16
G Chen
: 1. Parallels in the evolution of x-ray angiographic systems and devices used for minimally invasive endovascular therapy Charles Strother - DSA, invented by Dr. Charles Mistretta at UW-Madison, was the technology which enabled the development of minimally invasive endovascular procedures. As DSA became widely available and the potential benefits for accessing the cerebral vasculature from an endovascular approach began to be apparent, industry began efforts to develop tools for use in these procedures...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046482/we-de-207a-03-recent-advances-in-devices-used-in-neuro-interventions
#17
M Gounis
: 1. Parallels in the evolution of x-ray angiographic systems and devices used for minimally invasive endovascular therapy Charles Strother - DSA, invented by Dr. Charles Mistretta at UW-Madison, was the technology which enabled the development of minimally invasive endovascular procedures. As DSA became widely available and the potential benefits for accessing the cerebral vasculature from an endovascular approach began to be apparent, industry began efforts to develop tools for use in these procedures...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28006941/early-changes-of-brain-perfusion-after-subarachnoid-hemorrhage-the-effect-of-sodium-nitroprusside
#18
M Kolar, K Nohejlova, J Mares, J Pachl
Causes of early hypoperfusion after subarachnoid hemorrhage (SAH) include intracranial hypertension as well as vasoconstriction. The aim of the study was to assess the effect of intracerebroventricular (ICV) administration of sodium nitroprusside (SNP) on early hypoperfusion after SAH. Male Wistar rats (220-240 g) were used, SAH group received 250 microl of fresh autologous arterial blood into the prechiasmatic cistern; sham-operated animals received 250 microl of isotonic solution. Therapeutic intervention: ICV administration of 10 microg SNP; 5 microl 5 % glucose (SNP vehicle) and untreated control...
December 22, 2016: Physiological Research
https://www.readbyqxmd.com/read/27927702/bedside-cerebral-microdialysis-monitoring-of-delayed-cerebral-hypoperfusion-in-comatose-patients-with-poor-grade-aneurysmal-subarachnoid-haemorrhage
#19
Camille Patet, Hervé Quintard, Jean-Baptiste Zerlauth, Thomas Maibach, Laurent Carteron, Tamarah Suys, Pierre Bouzat, David Bervini, Marc Levivier, Roy T Daniel, Philippe Eckert, Reto Meuli, Mauro Oddo
BACKGROUND: Delayed cerebral ischaemia (DCI) is frequent after poor grade aneurysmal subarachnoid haemorrhage (SAH). Owing to the limited accuracy of clinical examination, DCI diagnosis is often based on multimodal monitoring. We examined the value of cerebral microdialysis (CMD) in this setting. METHODS: 20 comatose SAH participants underwent CMD monitoring-for hourly sampling of cerebral extracellular lactate/pyruvate ratio (LPR) and glucose-and brain perfusion CT (PCT)...
December 7, 2016: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/27923636/the-impact-of-early-aerobic-exercise-on-brain-microvascular-alterations-induced-by-cerebral-hypoperfusion
#20
Marina Leardini-Tristão, Juliana Pereira Borges, Felipe Freitas, Raquel Rangel, Anissa Daliry, Eduardo Tibiriçá, Vanessa Estato
The therapeutic potential of early exercise training following cerebral hypoperfusion was investigated on brain perfusion and inflammation in rats with permanent bilateral occlusion of the common carotid arteries (2VO). Wistar rats were subjected to 2VO or sham surgery and each group was then subdivided randomly into sedentary orexercisegroups. Early exercise training was initiated after three days of 2VO or sham surgery and consisted of seven days of treadmill training (30 min/day at ∼60% of maximal exercise test), composing four groups: 1) Sham sedentary (Sham-Sed), 2) Sham exercised (Sham-Ex), 3) 2VO sedentary (2VO-Sed) and 4) 2VO exercised (2VO-Ex)...
December 3, 2016: Brain Research
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