نتایج جستجو برای: pwi
تعداد نتایج: 545 فیلتر نتایج به سال:
Purpose: Smoking is a way of coping with anxiety and stress. This study aimed to identify the effects forest-thermal combined therapy on depression in smokers who desire quit smoking. Methods: Thirty participants were included study, 15 experimental group control group. Those participated three-day program. The program includes forest walks, meditation thermal charcoal kiln. Results: Before aft...
BACKGROUND AND PURPOSE The purpose of this study was to show that the computer segmentation algorithm Iterative Self-Organizing Data Analysis Technique (ISODATA), which integrates multiple MRI parameters (diffusion-weighted imaging [DWI], T2-weighted imaging [T2WI], and T1-weighted imaging [T1WI]) into a single composite image, is capable of defining the ischemic lesion in a time-independent ma...
The Bookend technique is a magnetic resonance imaging (MRI) dynamic susceptibility contrast method that provides reliable quantitative measurement of cerebral blood flow (CBF) and cerebral blood volume (CBV). The quantification is patient specific, is derived from a steady-state measurement of CBV, and is obtained from T(1) changes in the white matter and the blood pool after contrast agent inj...
BACKGROUND AND PURPOSE The perfusion-weighted imaging (PWI)/diffusion-weighted imaging (DWI) mismatch may identify patients who benefit from thrombolysis. However, some patients exhibit a "total mismatch," ie, negative DWI but extensive PWI defect. We aimed to assess clinical and MRI data of these patients. METHODS From June 2007 to December 2008, patients with anterior circulation ischemic s...
Much of the research on African American college students at predominantly White institutions (PWIs) indicates that African American students encounter difficulty in social and academic integration. In much of this research, it is assumed, explicitly or implicitly, that African American students experience lower adjustment and performance in these settings due to fewer socioeconomic resources i...
Diffusion-weighted imaging (DWI) and perfusion-weighted imaging (PWI) can rapidly detect lesions in acute ischemic stroke patients. The PWI volume is typically substantially larger than the DWI volume shortly after onset, that is, a diffusion/ perfusion mismatch. The aims of this study were to follow the evolution of the diffusion/ perfusion mismatch in permanent and 60- minute temporary focal ...
BACKGROUND AND PURPOSE Cerebral hyperperfusion syndrome is a rare but serious complication of carotid revascularization, including carotid endarterectomy (CEA) and carotid stent placement, which can occur in patients with preoperative impairments in cerebral hemodynamics. The purpose of this study was to determine whether preoperative cerebral blood volume (CBV) measured by perfusion-weighted M...
Previous dual-task studies examining the locus of semantic interference of distractor words in picture naming have obtained diverging results. In these studies, participants manually responded to tones and named pictures while ignoring distractor words (picture-word interference, PWI) with varying stimulus onset asynchrony (SOA) between tone and PWI stimulus. Whereas some studies observed no se...
Hemiplegic migraine (HM) is an unusual subset of migraine with aura, in which headache is associated with unilateral motor deficits, thought to be attributable to an underlying calcium channelopathy. In some cases the neurological dysfunction may outlast the headache and persist for many days. In the initial stages, hemiplegic migraine may mimic cerebral infarction. Within the first few hours a...
Background and Purpose: Diffusionand perfusion-weighted imaging (DWI/PWI) of acute ischemic stroke can be used to identify the ischemic core (DWI) and to estimate the penumbral tissue (PWI-DWI mismatch) which is at risk of infarction but is potentially salvageable. MRI of sodium, a marker of ionic homeostasis that is disrupted after ischemia, within the lesion may be complementary by indicating...
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