نتایج جستجو برای: heterogeneity correction

تعداد نتایج: 259444  

2011
Blake C. Stacey Andreas Gros Yaneer Bar-Yam

Spatial extent—the possibility that what happens at point A cannot immediately affect what happens at point B—is a complicating factor in mathematical biology, as it creates the opportunity for spatial non-uniformity. This non-uniformity must change our understanding of evolutionary dynamics, as the same organism in different places can have different expected evolutionary outcomes. Since organ...

2006
Iván Fernández-Val Francis Vella

This paper introduces bias-corrected estimators for nonlinear panel data models with both time invariant and time varying heterogeneity. These models include systems of equations with limited dependent variables and unobserved individual effects, and sample selection models with unobserved individual effects. Our two-step approach first estimates the reduced form by fixed effects procedures to ...

2015
Débora M. Trombetta Simone C. Cardoso Victor G. L. Alves Alessandro Facure Delano V. S. Batista Ademir X. da Silva

The combination of radiotherapy treatments and breast reconstruction, using temporary tissue expanders, generates several concerns due to the presence of a magnetic valve inside the radiation field. The objective of this work is to evaluate a radiotherapy treatment planning for a patient using a tissue expander. Isodose curve maps, obtained using radiochromic films, were compared to the ones ca...

Journal: :iranian journal of radiation research 0
s. senthilkumar department of radiotherapy, govt. rajaji hospital and madurai medical college, maduari-625 020, india v. ramakrishnan deptartment of laser studies, madurai kamaraj university, madurai, tamil nadu, india

background: the heterogeneous composition of the human body presents numerous tissue types and cavities with widely differing radiologic properties. the aim of the present work was to develop a low cost homogeneous and heterogeneous phantom and the absorbed dose were measured by ionization chamber for different radiotherapy treatment techniques and compared with treatment planning system absorb...

Journal: :iranian journal of basic medical sciences 0
abbas alimoradian department of pharmacology, school of medicine, shiraz university of medical sciences, shiraz, iran faegheh baha-aldini beigy department of pharmacology, school of medicine, shiraz university of medical sciences, shiraz, iran javad sajedianfard department of physiology, school of veterinary medicine, shiraz university, shiraz, iran mohammad reza panjehshahin department of pharmacology, school of medicine, shiraz university of medical sciences, shiraz, iran

objective(s) while the nucleus accumbens and the striatum have received much attention regarding their roles in stereotyped behaviors, the role of the medial prefrontal cortex (mpfc) has not been investigated to the same degree. few studies have reported the role of the mpfc in dopaminergic induction of locomotor hyperactivity. the mpfc is a heterogeneous area (the anterior cingulated, prelimbi...

Journal: :iranian journal of radiation research 0
a. mostaar medical physics department, tehran university of medical sciences, tehran, iran m. allahverdi department of radiotherapy physics, cancer institute, tehran, iran m. shahriari gamma irradiation center, atomic energy organization of iran, tehran, iran

background: in treating patients with radiation, the degree of accuracy for the delivery of tumor dose is recommended to be within ± 5% by icru in report 24. the experimental studies have shown that the presence of low-density inhomogeneity in areas such as the lung can lead to a greater than 30% change in the water dose data. therefore, inhomogeneity corrections should be used in treatment pla...

Journal: :health scope 0
iman tahamtan health information mangement research center, hormozgan university of medical sciences, bandar abbas, ir iran; health information mangement research center, hormozgan university of medical sciences, bandar abbas, ir iran. tel: +98-7613337192 farah moayedi department of psychiatry, behavioral and neurosciences research center, hormozgan university of medical sciences, bandar abbas, ir iran

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