000			03210cam a2200349 a 4500
003			EG-GiCUC
005			20250223032549.0
008			200829s2019 ua dh f m 000 0 eng d
040			_aEG-GiCUC _beng _cEG-GiCUC
041	0		_aeng
049			_aDeposite
097			_aPh.D
099			_aCai01.12.04.Ph.D.2019.Eb.A
100	0		_aEbtesam Mohamed Mohamedy
245	1	0	_aAssessment the photo-neutron contamination of IMRT and 3D-conformal techniques using Experimental measurements and Monte Carlo simulations / _cEbtesam Mohamed Mohamedy ; Supervised Wafaa Mohamed Khalil , Nadia Lotfy Helal , Ehab Marouf Attalla
246	1	5	_aتقييم التلوث النيوترونى لتقنيات العلاج متغير الشده وثلاثى الأبعاد باستخدام نموذج للمحاكاة والتأكد التجريبى
260			_aCairo : _bEbtesam Mohamed Mohamedy , _c2019
300			_a74 , (10) P. : _bcharts , facsimiles ; _c25cm
502			_aThesis (Ph.D.) - Cairo University - Faculty of Science - Department of Biophysics
520			_aThe aim of the study is to evaluate the dependence of photo-neutron production on different variables and different treatment methods (IMRT and 3DCRT techniques) using TLD (600/700) and MC simulation. The equivalent neutron doses were measured at different field sizes, depth in phantom, gantry angles and different distances along patient couch. The equivalent neutron doses were measured for 5 Prostate cancer cases using TLD (600/700).The equivalent neutron doses were measured for selected rectum case using TLD (600/700) and Geant 4 simulation. The results showed that: The measured equivalent neutron doses decreases from0.2 mSv/Gy to0.09 mSv/Gy as increases field sizes from 2x2 cm2 to 20x20 cm2. The measured equivalent neutron doses was maximum (0.15 mSv/Gy) at dmax =5 cm and decreases gradually as increases depth in phantom reaches to 0.07 mSv/Gy at 10 cm. The measured equivalent neutron doses decreases from 1.5mSv/Gy to0.02 mSv/Gy when measured at isocenter and at 100cm along the patient couch. Using 3DCRT for PTV and OARs were ranging from 0.027 to 0.39 mSv per photon Gy and for IMRT were 0.135 to 2.34 mSv per photon Gy. The measured equivalent neutron doses for rectum case were ranging from 0.04 to 0.24mSv per photon Gy, this result nearly the same calculated by MC. In conclusion the photo-neutron production is decreases as increases field size and distance from isocenter along patient couch while increases with depth in phantom up to dmax and decreases gradually as increases depth in phantom. IMRT requires longer beam-on time than 3DCRT leading to worse OARs sparing and increase the production of photo-neutrons than 3DCRT
530			_aIssued also as CD
653		4	_aIntensity Modulated Radiation Therapy (IMRT )
653		4	_aThe equivalent neutron doses
653		4	_aThree-dimensional conformal radio therapy (3DCRT )
700	0		_aEhab Marouf Attalla , _eSupervisor
700	0		_aNadia Lotfy Helal , _eSupervisor
700	0		_aWafaa Mohamed Khalil , _eSupervisor
856			_uhttp://172.23.153.220/th.pdf
905			_aNazla _eRevisor
905			_aShimaa _eCataloger
942			_2ddc _cTH
999			_c77445 _d77445