نتایج جستجو برای: entrance dose

تعداد نتایج: 319618  

2015
Evlyn Pless Jovel Queirolo Noa Pinter-Wollman Sam Crow Kelsey Allen Maya B. Mathur Deborah M. Gordon Nicolas Chaline

Social insect colonies use interactions among workers to regulate collective behavior. Harvester ant foragers interact in a chamber just inside the nest entrance, here called the 'entrance chamber'. Previous studies of the activation of foragers in red harvester ants show that an outgoing forager inside the nest experiences an increase in brief antennal contacts before it leaves the nest to for...

2015
Nicholas N. Sperling E. Ishmael Parsai

The problem of determining the in vivo dosimetry for patients undergoing radiation treatment has been an area of interest since the development of the field. More recent methods of measurement employ Electronic Portal Image Devices (EPID), or dosimeter arrays, for entrance or exit fluence determination. The more recent methods of in vivo dosimetry make use of detector arrays and reconstruction ...

Journal: :acta medica iranica 0
mohammad taghi bahreyni toossi medical physics research center, school of medicine, mashhad university of medical sciences, mashhad, iran. fateme akbari medical physics research center, school of medicine, mashhad university of medical sciences, mashhad, iran shahram bayani roodi medical physics research center, school of medicine, mashhad university of medical sciences, mashhad, iran.

nowadays, radiography is a necessary procedure in diagnosis and treatment of patients with dental problems. according to the alara (as low as reasonably achievable) principle, dentists must take radiographs of sufficient quality at the lowest possible radiation dose to the patients. the assessment of patient dose on panoramic radiography is difficult because of dynamic nature of the imaging pro...

ژورنال: سنجش و ایمنی پرتو 2020

Given the extensive use of common mammography tests for screening and diagnosis of breast cancer, there are concerns over the increased dose absorbed by the patient due to the sensitivity of the breast tissue. Thus, knowing the Mean Glandular Dose (MGD) before radiation to the patient through its estimation can be helpful. For this reason, the MultiLayer Perceptron (MLP) neural network model wa...

2017
Kristina Hellén-Halme Mats Nilsson

Objectives: Efforts are made in radiographic examinations to obtain the best image quality with the lowest possible absorbed dose to the patient. In dental radiography, the absorbed dose to patients is very low, but exposures are relatively frequent. It has been suggested that frequent low-dose exposures can pose a risk for development of future cancer. It has previously been reported that ther...

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