scholarly journals Corrections of photon beam profiles of small fields measured with ionization chambers using a three‐layer neural network

2021 ◽  
Author(s):  
Ann‐Britt Schönfeld ◽  
Karl Mund ◽  
Guanghua Yan ◽  
Andreas Alexander Schönfeld ◽  
Hui Khee Looe ◽  
...  
Keyword(s):  
Neural Network ◽  
Photon Beam ◽  
Ionization Chambers ◽  
Small Fields

scholarly journals Study of output difference of two different ionization chambers for large fields used in radiotherapy

2017 ◽  
Vol 13 (4) ◽  
pp. 4901-4907
Author(s):  
Ehab A. Hegazy
Keyword(s):  
Quality Control ◽  
Data Entry ◽  
Whole Body ◽  
Large Field ◽  
Photon Beams ◽  
Ionization Chambers ◽  
Output Factor ◽  
Small Fields ◽  
Important Field

Many radiotherapy centers don’t pay attention to effect of ionization champers type on accuracy of quality control measurements. They use any available ionization champers in all quality control and data entry measurements (1,2) . Many studies were carried out in this field to compare different ionization champers in small fields but large fields were not completely compared before (3.4).  The aim of this work is to compare   output factor in large field using two different sizes ionization champers connected to electrometer. Final out put were obtained from the farmer and smidflex dosimeter irradiated with 6 MV photon beams. Important field side ranging from 20 cm to 70 cm side field is measured in whole body radiation (5, 6). For all examined large  field sizes a difference ranging from 1% to 5 % was found when added to other calibration errors it will exceeds the acceptable margin. The largest difference was found in field side 70 cm this may be due to large scattering radiation

scholarly journals Evaluation of a neural network‐based photon beam profile deconvolution method

2020 ◽  
Vol 21 (6) ◽  
pp. 53-62
Author(s):  
Karl Mund ◽  
Jian Wu ◽  
Chihray Liu ◽  
Guanghua Yan
Keyword(s):  
Neural Network ◽  
Beam Profile ◽  
Photon Beam ◽  
Deconvolution Method

Determinations of the correction factors for small fields in cylindrical ionization chambers based on measurement and numerical calculation

2015 ◽  
Vol 67 (1) ◽  
pp. 57-62 ◽  
Author(s):  
Kwangwoo Park ◽  
Wonhoon Choi ◽  
Sungho Park ◽  
Jin Hwa Choi ◽  
Suk Won Park ◽  
...  
Keyword(s):  
Numerical Calculation ◽  
Correction Factors ◽  
Ionization Chambers ◽  
Small Fields

Polarity effect in commercial ionization chambers used in photon beams with small fields

2009 ◽  
Vol 2 (1) ◽  
pp. 97-103 ◽  
Author(s):  
Tetsunori Shimono ◽  
Kichiro Koshida ◽  
Hidekazu Nambu ◽  
Kosuke Matsubara ◽  
Hiroshi Takahashi ◽  
...  
Keyword(s):  
Photon Beams ◽  
Ionization Chambers ◽  
Polarity Effect ◽  
Small Fields
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