نتایج جستجو برای: intensity method

تعداد نتایج: 1778753  

Journal: :Physics in medicine and biology 2002
Jeffrey V Siebers Paul J Keall Jong Oh Kim Radhe Mohan

Monte Carlo (MC) algorithms are recognized as the most accurate methodology for patient dose assessment. For intensity-modulated radiation therapy (IMRT) delivered with dynamic multileaf collimators (DMLCs), accurate dose calculation, even with MC, is challenging. Accurate IMRT MC dose calculations require inclusion of the moving MLC in the MC simulation. Due to its complex geometry, full trans...

2014
Hanne R. Johnsen Kirsten Krause

Reliable, rapid and inexpensive detection of cellulolytic enzymes that can be used for a wide variety of biological and environmental samples are currently in high demand. Here, a new cellulase detection protocol is described that circumvents problems observed with popular agar-based methods by exploiting the ability of carboxymethylcellulose (CMC) to form gel-like surfaces on its own. These pu...

Journal: :American journal of dentistry 2010
Jeong-Kil Park Tae-Hyong Kim Ching-Chang Ko Franklin García-Godoy Hyung-Il Kim Yong Hoon Kwon

PURPOSE To examine the effect of staining solutions on the discoloration of resin nanocomposites. METHODS Three resin nanocomposites (Ceram X, Grandio, and Filtek Z350) were light cured for 40 seconds at a light intensity of 1000 mW/cm2. The color of the specimens was measured in %R (reflectance) mode before and after immersing the specimens in four different test solutions [distilled water (...

Journal: :Medical physics 2006
Laure Parent Joao Seco Phil M Evans Andrew Fielding David R Dance

This study focused on predicting the electronic portal imaging device (EPID) image of intensity modulated radiation treatment (IMRT) fields in the absence of attenuation material in the beam with Monte Carlo methods. As IMRT treatments consist of a series of segments of various sizes that are not always delivered on the central axis, large spectral variations may be observed between the segment...

Journal: :Japanese Journal of Radiological Technology 1992

Journal: :Energies 2022

To accurately and reliably predict the occurrence of rockburst disasters, a intensity level prediction model based on FA-SSA-PNN is proposed. Crding to internal external factors occurrence, six influencing (σθ, σt, σc, σc/σt, σθ/σc, Wet) were selected build index system. Seventy-five sets typical case data at home abroad collected, original preprocessed factor analysis (FA), comprehensive index...

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