نتایج جستجو برای: 3d chamber

تعداد نتایج: 228933  

Arass Rasaei, Raheleh Rooshenas

Introduction: Electronic portal imaging devices (EPIDs) could potentially be useful for intensity-modulated radiation therapy (IMRT) and VMAT QA. The data density, high resolution, large active area, and efficiency of the MV EPID make it an attractive option. However, EPIDs were designed as imaging devices, not dosimeters, and as a result they do not inherently measure dose in ...

Journal: :Journal of visualized experiments : JoVE 2015
David A Stout Jennet Toyjanova Christian Franck

The importance of cell migration can be seen through the development of human life. When cells migrate, they generate forces and transfer these forces to their surrounding area, leading to cell movement and migration. In order to understand the mechanisms that can alter and/or affect cell migration, one can study these forces. In theory, understanding the fundamental mechanisms and forces under...

Journal: :iranian journal of radiation research 0
t. siji cyriac department of physics, noorul islam centre for higher education, kumaracoil, thuckalay, kanyakumari district, 629 180, tamilnadu, india m.m. musthafa department of physics, university of calicut, thenhipalam, malappuram, 673 635, kerala, india r. ganapathi raman department of physics, noorul islam centre for higher education, kumaracoil, thuckalay, kanyakumari district, 629 180, tamilnadu, india k. abdul haneefa infn and department of physics, university of torino, via p. giuria, 10125, torino, italy saju bhasi department of radiation physics, regional cancer center, trivandrum, 695 011 , kerala, india

background: the present work aims to study the out-of-field photon calculation accuracy of a commercial treatment planning system (tps), oncentra, for three-dimensional conformal radiotherapy (3d-crt) and intensity modulated radiation therapy (imrt) treatment techniques from elekta synergy medical linear accelerator. materials and methods: accuracy of individual out-of-field dose components was...

Journal: :Europace 2008
Christopher Piorkowski Simon Kircher Arash Arya Thomas Gaspar Masahiro Esato Sam Riahi Andreas Bollmann Daniela Husser Charlotte Staab Philipp Sommer Gerhard Hindricks

AIMS Accurate orientation within true three-dimensional (3D) anatomies is essential for the successful radiofrequency (RF) catheter ablation of atrial fibrillation (AF) and atrial macro-re-entrant tachycardia (MRT). In this prospective study, ablation of AF and MRT was performed exclusively using a pre-acquired and integrated computed tomography (CT) image for anatomical 3D orientation without ...

2016
Yang Yang Tianyu Liu Xun Zhu Feng Zhang Dingding Ye Qiang Liao Yat Li

A 3D nitrogen-doped graphene aerogel (N-GA) as an anode material for microbial fuel cells (MFCs) is reported. Electron microscopy images reveal that the N-GA possesses hierarchical porous structure that allows efficient diffusion of both bacterial cells and electron mediators in the interior space of 3D electrode, and thus, the colonization of bacterial communities. Electrochemical impedance sp...

2009
H. Müller D. Shah

Background: Left atrial size is a determinant of atrial fibrillation ablation efficacy and embolic risk. The recent advent of real-time full-volume 3DE allows now rapid measurement of chamber volume more accurately than with standard two-dimensional echocardiography as volume is reconstructed from endocardial contours of the entire chamber without making geometric assumptions. Electro-anatomic ...

H.A. Nedaie, M. Aghili, M. Allahverdi, M. Esfehani, S.A. Vaezzadeh,

Background: To evaluate the dosimetric difference between conventional and three-dimensional conformal Radiotherapy (3D-CRT) using 6 and 18 MV X-ray photons. Materials and Methods: Computed tomography scans of 26 pelvic patients were acquired and transferred to the 3D treatment planning system. For each patient, 8 Conventional plans (3, 4, 5 and 6 Fields) and one 3D-CRT plan were prep...

Journal: :iranian journal of radiation research 0
s.a. vaezzadeh department of medical physics and biomedical engineering, tehran university of medical sciences, tehran, iran m. allahverdi department of medical physics and biomedical engineering, tehran university of medical sciences, tehran, iran h.a. nedaie department of radiotherapy – oncology, tehran university of medical sciences, tehran, iran m. aghili department of radiotherapy – oncology, tehran university of medical sciences, tehran, iran m. esfehani department of radiotherapy – oncology, tehran university of medical sciences, tehran, iran

background: to evaluate the dosimetric difference between conventional and three-dimensional conformal radiotherapy (3d-crt) using 6 and 18 mv x-ray photons. materials and methods: computed tomography scans of 26 pelvic patients were acquired and transferred to the 3d treatment planning system. for each patient, 8 conventional plans (3, 4, 5 and 6 fields) and one 3d-crt plan were prepared using...

Journal: :Analytical chemistry 2014
Jiyeon Kim Jodi L Connell Marvin Whiteley Allen J Bard

We report a novel strategy for studying a broad range of cellular behaviors in real time by combining two powerful analytical techniques, micro-3D printing and scanning electrochemical microscopy (SECM). This allows one, in microbiological studies, to isolate a known number of cells in a micrometer-sized chamber with a roof and walls that are permeable to small molecules and observe metabolic p...

2017
Masataka NAKAYA Hideyuki TANABE Shingo TAKAMATSU Misaki HOSOKAWA Tasuku MITANI

The fertilized oocyte begins cleavage, leading to zygotic gene activation (ZGA), which re-activates the resting genome to acquire totipotency. In this process, genomic function is regulated by the dynamic structural conversion in the nucleus. Indeed, a considerable number of genes that are essential for embryonic development are located near the pericentromeric regions, wherein the heterochroma...

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