نتایج جستجو برای: partial volume effects
تعداد نتایج: 2012014 فیلتر نتایج به سال:
Objectives of this study were to explore the untoward effects of cottonseed meal (CSM) on male reproductive performance of broiler breeders and ameliorating effects of lysine addition in rations. A total of 80 broiler breeder males of 40 weeks of age were divided in to 8 groups. The four groups were fed diets containing CSM @ of 0, 10, 20 and 30%, respectively. The remaining four groups were gi...
Technological advances over recent decades now allow for in vivo observation of human brain tissue through the use of neuroimaging methods. While this field originated with techniques capable of capturing macrostructural details of brain anatomy, modern methods such as diffusion tensor imaging (DTI) that are now regularly implemented in research protocols have the ability to characterize brain ...
INTRODUCTION: Tracer kinetic analysis of DCE-MRI data requires concentration of contrast agent (intravenously injected) in the plasma (as an input function). Both standard (8) and individually measured plasma concentration curves are being used. The use of individually measured plasma curve (if accurately measured) has advantages over standard plasma curve as it improves accuracy of measurement...
BACKGROUND T1-mapping using the Shortened Modified Look-Locker Inversion Recovery (ShMOLLI) technique enables non-invasive assessment of important myocardial tissue characteristics. However, tachyarrhythmia may cause mistriggering and inaccurate T1 estimation. We set out to test whether systolic T1-mapping might overcome this, and whether T1 values or data quality would be significantly differe...
In the present paper simulation of tidal currents on three-dimensional geometry of the Persian Gulf is performed by the solution of the depth averaged hydrodynamics equations. The numerical solution was applied on two types of discritized simulation domain (Persian Gulf); with and without major islands. The hydrodynamic model utilized in this work is formed by equations of continuity and motion...
AIMS AND METHODS To determine whether volume loading may be beneficial for the performance of ischaemic heart, myocardial ischaemia was created by partial occlusion of the left anterior descending coronary artery (LAD) to reduce the blood flow to 30 approximately 40% of basal level in 11 open chest anaesthetised dogs. Global left ventricular function as well as regional performance were studied...
pure GM CBF (2 row), and net CBF image (3rd row) are shown for AD (left panel) and HC (right panel). Note the overall lower intensity of CBF in AD patients as compared to the age-matched HC. Also, note that pure GM CBF maps are independent of GM fractional volume at a given voxel thus reflecting voxel’s GM flow density. Fig2: ROI-wise average CBF values for HC, MCI, and AD are shown in bleu, ye...
PURPOSE To demonstrate the degree of the cerebral blood flow (CBF) estimation bias that could arise from distortion of the arterial input function (AIF) as a result of partial-volume effects (PVEs) in dynamic susceptibility contrast (DSC) magnetic resonance imaging (MRI). MATERIALS AND METHODS A model of the volume fraction an artery occupies in a voxel was devised, and a mathematical relatio...
PURPOSE We used what is to our knowledge a new method to estimate volume loss after partial nephrectomy to assess the relative contributions of ischemic injury and volume loss on functional outcomes. MATERIALS AND METHODS We analyzed the records of 301 consecutive patients who underwent conventional partial nephrectomy between 2007 and 2010 with available data to meet inclusion criteria. Perc...
A. Gass Departments of Neurology/Neuroradiology, Universitätskliniken, Kantonsspital Basel, Petersgraben 4, 4031 Basel, Switzerland Abstract There are currently four problems in characterising small nonuniform lesions or other objects in Magnetic Resonance images where partial volume effects are significant. Object size is overor under-estimated; boundaries are often not reproducible; mean obje...
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