background: prediction of the absorbed dose in irradiated volume plays an important role in the outcome of radiotherapy. application of small fields for radiotherapy of thorax makes the dose calculation process inaccurate due to the existence of electronic disequilibrium and intrinsic deficiencies in dose calculation algorithms. to study the lung absorbed dose in radiotherapy with small fields,...

Background: Prediction of the absorbed dose in irradiated volume plays an important role in the outcome of radiotherapy. Application of small fields for radiotherapy of thorax makes the dose calculation process inaccurate due to the existence of electronic disequilibrium and intrinsic deficiencies in dose calculation algorithms. To study the lung absorbed dose in radiotherapy with smal...

In high energy photon dose calculations, electron transport is an important process especially in low density regions such as lung. Electron transport is captured in time consuming algorithms such as Monte Carlo, scaling of the primary kernels, etc., but not in the eecient FFT convolution dose calculation. We do not want to scale the kernels in order to take advantage of the FFT-we continue to ...

the objective of this paper is econometric analysis of iranian agricultural products markets (case study ofpotatoes) by using equilibrium and disequilibrium techniques. sections i and ii proceeds by classification of disequilibrium econometric literature and supply and demand analysis for agriculural products, respectively. in the other parts ofpaper potato market lif iran was hypothesized and ...

this paper tries to survey irans regional labor market disequilibrium within 1996-2000. according to the results there has been an increase in the amount of disequilibrium of irans national as well as regional labor markets. incomplete labor market information on vacant job opportunities in different regions of the country along with high costs of migration have been the major causes of unemplo...