نتایج جستجو برای: four dimensional computed tomography
تعداد نتایج: 1227323 فیلتر نتایج به سال:
The major problem with ventilation distribution calculations using DIR and 4DCT is the motion artifacts in 4DCT. Quite often not all phases would exhibit mushroom motion artifacts. If the ventilation series similarity is sufficiently robust, the ventilation distribution can be calculated using only the artifact-free phases. This study investigated the ventilation similarity among the data deriv...
The advent of three-dimensional printing (3DP) technology has enabled the creation of a tangible and complex 3D object that goes beyond a simple 3D-shaded visualization on a flat monitor. Since the early 2000s, 3DP machines have been used only in hard tissue applications. Recently developed multi-materials for 3DP have been used extensively for a variety of medical applications, such as persona...
Motivated by a motion detection system the application of a new category of Kohonen‘s Self-Organizing Map (SOM) [8] is presented in this paper. Based on earlier work of Seiffert and Michaelis on three-dimensional SOMs [10], [11] a new implementation of growing multi-dimensional SOMs, the Quasi-Four-Dimensional Neuroncube (QFDN), has already been introduced in [12]. This paper focuses on the app...
PURPOSE To assess the temporal and spatial accuracy of the GateCT™ system (VisionRT, London, UK), a recently released respiratory tracking system for 4DCT, under both ideal and nonideal respiratory conditions. METHODS Three experiments were performed by benchmarking and comparing its results with the ground-truth input data and those generated by the widely used Varian RPM™ system (Real-time ...
How structure relates to function--across spatial scales, from the single molecule to the whole organism--is a central theme in biology. Bioengineers, however, wrestle with the converse question: will function follow form? That is, we struggle to approximate the architecture of living tissues experimentally, hoping that the structure we create will lead to the function we desire. A new means to...
Affiliations: From the Department of Surgery and Cancer, 2 Radiology/ Nuclear medicine, Cellular Pathology, Imperial College London and Imperial College Healthcare NHS Trust, Hammersmith and Charing Cross Hospitals, London, United Kingdom, 4 Cellular Pathology, Northwest London Hospitals NHS Trust. Running Title: [C]Choline PET-CT for nodal evaluation in prostate cancer
Our goal was to develop a system that would allow us to recreate live patient arterial pathology by using an industrial technique known as stereolithography (or rapid prototyping). In industry, drawings rendered into dicom files can be exported to a computer programmed to drive various industrial tools. Those tools then make a 3D structure shown by the original drawings. We manipulated CT scan ...
Nowadays many MRI scans can give 3D volume data with different contrasts, but the observers may want to view various contrasts in the same 3D volume. The conventional 2D medical fusion methods can only fuse the 3D volume data layer by layer, which may lead to the loss of interframe correlative information. In this paper, a novel 3D medical volume fusion method based on 3D band limited shearlet ...
Within an effective field theory framework we compute the most general structure of the one-loop corrections to the 4D gauge couplings in one-and two-dimensional orbifold compacti-fications with non-vanishing constant gauge background (Wilson lines). Although such models are non-renormalisable, we keep the analysis general by considering the one-loop corrections in three regularisation schemes:...
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