نتایج جستجو برای: simplified dynamic phantom
تعداد نتایج: 468909 فیلتر نتایج به سال:
Purpose Landmark registration is the traditional method to convert patient's physical space to image space for neurosurgical navigation. While marker-based registration is prevailing, its shortcomings such as marker shift and missing often cause registration inaccuracy or failure. Now, commercially available markerless registration which uses laser surface scanner or touch sensitive point scann...
Over the last decade, the R-tree has emerged as one of the most robust multidimensional access methods. However, before the R-tree can be integrated as an access method to a commercial strength database management system, eecient techniques to provide transactional access to data via R-trees need to be developed. Concurrent access to data through a multidi-mensional data structure introduces th...
Over the last decade, the R-tree has emerged as one of the most robust multidimensional access methods. However, before the R-tree can be integrated as an access method to a commercial strength database management system, e cient techniques to provide transactional access to data via R-trees need to be developed. Concurrent access to data through a multidimensional data structure introduces the...
Phantom perception refers to the conscious awareness of a percept in the absence of an external stimulus. On the basis of basic neuroscience on perception and clinical research in phantom pain and phantom sound, we propose a working model for their origin. Sensory deafferentation results in high-frequency, gamma band, synchronized neuronal activity in the sensory cortex. This activity becomes a...
a frequency domain dynamic analysis is needed to obtain the response of structures constructed on a system of base isolators on flexible soil when subjected to earthquake ground motion. in such systems, the lateral stiffness of the base isolators is so small, compared to the structural stiffness, that in an earthquake attack the fundamental vibration mode dominates the response. with this in mi...
Phantom types are data types with type constraints associated with different cases. Examples of phantom types include typed type representations and typed higher-order abstract syntax trees. These types can be used to support typed generic functions, dynamic typing, and staged compilation in higher-order, statically typed languages such as Haskell or Standard ML. In our system, type constraints...
A novel design of solid dynamic phantom with tissue-like optical properties is presented, which contains variable regions of contrast which are activated electrically. Reversible changes in absorption are produced by localized heating of targets impregnated with thermochromic pigment. A portable, battery-operated prototype has been constructed, and its optical and temporal characteristics have ...
Introduction A 2D analytical cardiac magnetic resonance imaging (MRI) phantom in the Fourier domain was introduced by Brummer et al. [1] to compare acceleration strategies based on a reduction of the field of view. In related work by our group and others the value of a standardized simulation phantom to test and compare reconstruction methods for cardiac imaging has become evident. In this work...
PURPOSE To develop an anthropomorphic phantom to simulate heart, lung, and blood motion. Magnetic resonance imaging (MRI) is sensitive to image distortion and artifacts caused by motion. Imaging phantoms are used to test new sequences, but generally, these phantoms lack physiological motion. For the validation of new MR-based endovascular interventional and other techniques, we developed a dyna...
Background: The advantages of proton beam in radiation therapy- like small lateral scattering as well as absence of exit dose tail in the organs which are after the tumor- make it capable of delivering more treatment doses to the target and much lesser to the critical tissues near it. Materials and Methods: In this study, the Monte Carlo MCNPX code has been used to simulate a slab head phantom ...
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