نتایج جستجو برای: atlas based dosimetry

تعداد نتایج: 2959937  

2002
Vadim CHUMAK

The paper is devoted to review of development and application of EPR dosimetry with teeth in Ukraine. It deals with specific features of the EPR dosimetry protocol, which was developed and is practically used in SCRM for retrospective dosimetry of clean-up workers (liquidators). Extensive methodological research was conducted in SCRM in order to develop an original version of EPR dosimetric pro...

Journal: :Proceedings of SPIE--the International Society for Optical Engineering 2009
Feng Shi Yong Fan Songyuan Tang John Gilmore Weili Lin Dinggang Shen

Brain tissue segmentation of neonate MR images is a challenging task in study of early brain development, due to low signal contrast among brain tissues and high intensity variability especially in white matter. Among various brain tissue segmentation algorithms, the atlas-based segmentation techniques can potentially produce reasonable segmentation results on neonatal brain images. However, th...

2017
Mona Rosenke Kevin S. Weiner Michael A. Barnett Karl Zilles Katrin Amunts Rainer Goebel Kalanit Grill-Spector

The data presented here are related to the research article: "A cross-validated cytoarchitectonic atlas of the human ventral visual stream" in which we developed a cytoarchitectonic atlas of ventral visual cortex. Here, we provide two additional quantifications of this cytoarchitectonic atlas: First, we quantify the effect of brain template on cross-validation performance. The data show a compa...

Journal: :European Physical Journal Plus 2021

Abstract Ionizing radiation is ubiquitous in the environment. Its source can be natural, such as radioactive materials present soil and cosmic rays, or artificial, fuel for nuclear power plants. Overexposure to ionizing may damage living tissue could cause severe health problems (i.e., mutations, sickness, cancer, death). Cytogenetic bio-dosimetry has great advantage take into account inter-ind...

Journal: :journal of biomedical physics and engineering 0
f seif arak university of medical sciences m r bayatiani arak university of medical sciences

background: megavoltage beams used in radiotherapy are contaminated with secondary electrons. different parts of linac head and air above patient act as a source of this contamination. this contamination can increase damage to skin and subcutaneous tissue during radiotherapy.  monte carlo simulation is an accurate method for dose calculation in medical dosimetry and has an important role in opt...

Journal: :iranian journal of radiation research 0
w. parwaie department of radiology, faculty of para-medicine, hormozgan university of medical sciences, bandar abbas, iran m. yarahmadi department of medical physics, faculty of medicine, kurdistan university of medical sciences, sanandaj, iran h.a. nedaie department of radiotherapy, cancer institute, tehran university of medical sciences, tehran, iran m.h. zahmatkesh shahid beheshti university of medical sciences, tehran, iran a.h. barati department of medical physics, faculty of medicine, kurdistan university of medical sciences, sanandaj, iran m. afkhami department of radiology, faculty of para-medicine, hormozgan university of medical sciences, bandar abbas, iran

background: accurate small radiation field dosimetry is essential in modern radiotherapy techniques such as stereotactic radiosurgery (srs) and intensity modulated radiotherapy (imrt). precise measurement of dosimetric parameters such as beam profile, percentage depth doses and output factor of these beams are complicated due to the electron disequilibrium and the steep dose gradients. in the p...

2008
X. Zhuang D. J. Hawkes W. R. Crum R. Boubertakh S. Uribe D. Atkinson P. Batchelor T. Schaeffter R. Razavi D. L. G. Hill

We propose a new framework to propagate the labels in a heart atlas to the cardiac MRI images for ventricle segmentations based on image registrations. The method employs the anatomical information from the atlas as priors to constrain the initialisation between the atlas and the MRI images using region based registrations. After the initialisation which minimises the possibility of local misal...

2011
R. D. Datteri A. J. Asman B. A. Landman B. M. Dawant

Multi-atlas registration-based segmentation has recently become a popular technique in medical imaging. Since the quality of individual atlas segmentations affect the quality of the results, atlas selection and atlas fusion have become important areas of research for multi-atlas segmentation. In this paper, we present an automatic technique that approximately calculates the quality of registrat...

Journal: :Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology 2008
Olivier Commowick Vincent Grégoire Grégoire Malandain

PURPOSE Radiotherapy planning requires accurate delineations of the tumor and of the critical structures. Atlas-based segmentation has been shown to be very efficient to automatically delineate brain critical structures. We therefore propose to construct an anatomical atlas of the head and neck region. METHODS AND MATERIALS Due to the high anatomical variability of this region, an atlas built...

Journal: :Journal of Radiotherapy in Practice 2023

Abstract Introduction: This is the second of two papers giving an overview use Monte-Carlo techniques for radiotherapy applications. Methods: The first paper gave introduction and introduced some codes that are available to user wishing model different aspects treatment. It also aims serve as a useful companion curated collection on have been published in this journal. Results Conclusions: focu...

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