TAILIEUCHUNG - Neuromonitoring and intracranial pressure XVI: Part 2

(BQ) Continued part 1, part 2 of the document Neuromonitoring and intracranial pressure XVI has contents: Comparing models of spontaneous variations, maneuvers and indexes to assess dynamic cerebral autoregulation, medical waveform format encoding rules representation of neurointensive care waveform data, room air readings of brain tissue oxygenation probes,. and other contents. Invite you to refer. | Increasing the Contrast-to-Noise Ratio of MRI Signals for Regional Assessment of Dynamic Cerebral Autoregulation sag José L. Jara Nazia P. Saeed Ronney B. Panerai and Thompson G. Robinson Abstract Objective To devise an appropriate measure of the quality of a magnetic resonance imaging MRI signal for the assessment of dynamic cerebral autoregulation and propose simple strategies to improve its quality. Materials and methods Magnetic resonance images of 11 healthy subjects were scanned during a transient decrease in arterial blood pressure BP . Mean signals were extracted from non-overlapping brain regions for each image. An ad-hoc contrast-to-noise ratio CNR was used to evaluate the quality of these regional signals. Global mean signals were obtained by averaging the set of regional signals resulting after applying a Hampel filter and discarding a proportion of the lower quality component signals. Results Significant improvements in CNR values of global mean signals were obtained whilst maintaining significant correlation with the original ones. A Hampel filter with a small moving window and a low rejection threshold combined with a selection of the 50 component signals seems a recommendable option. Conclusions This work has demonstrated the possibility of improving the quality of MRI signals acquired during transient drops in BP. This approach needs validation at a voxel level which could help to consolidate MRI as a technological alternative to the standard techniques for the study of cerebral autoregulation. . Jara Departamento de Ingeniería Informática Universidad de Santiago de Chile USACH Santiago Chile e-mail . Saeed Ageing and Stroke Medicine Department of Cardiovascular Sciences University of Leicester Leicester UK . Panerai . Robinson Ageing and Stroke Medicine Department of Cardiovascular Sciences University of Leicester Leicester UK NIHR Biomedical Research Unit for Cardiovascular Sciences University of Leicester .

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• Intracranial pressure
• Brain monitoring technology
• Neurocritical care informatics
• Comparing models
• Spontaneous variations
• Brain tissue oxygenation probes
• BMC Anesthesiology
• Intracranial pressure monitoring
• Elevated intracranial pressure
• Cerebral hemisphere
• Traumatic brain injury
• Cerebral perfusion pressure variability
• Severe traumatic brain injury outcomes
• The cerebrovascular resistance
• Abdominal surgery
• Epidural anesthesia
• Cerebral perfusion pressure
• Postoperative analgesia
• Bài giảng Tăng áp lực nội sọ
• Tăng áp lực nội sọ
• Raise intracranial pressure
• Điều trị Talns
• Triệu chứng tăng áp lực nội sọ
• biến chứng tăng áp lực nội sọ
• Hypertonic saline
• Acute elevated intracranial pressure
• Stroke patient
• Osmotic therapy
• Hemodynamic status
• Intraventricular intracranial pressure monitoring
• Severe traumatic brain injury
• Older adults
• Intraventricular ICP monitoring
• Hematoma enlargement
• Brain herniation
• Hemorrhagic stroke
• Optic nerve sheath diameter
• Trendelenburg position
• Non neurologic patients
• Optic nerve
• Mouth gag
• Intraorbital pressure
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• Major obstetric haemorrhage
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• The short cases
• The clinical anaesthesia vivabook
• Textbook of neurointensive care
• Neurointensive care
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