Understanding and predicting the energy loss of swift ions in metals is important for many applications charged particle beams, such as analysis modification materials, recently modelling metal nanoparticle radiosensitisation ion beam cancer therapy. We have calculated stopping power transition Pt Au protons alpha particles a wide range, using dielectric formalism, which realistically accounts ...

A theoretical method is presented that allows identification of optimal x-ray imaging geometry, considering the effects of x-ray source distribution, imaging task, x-ray scatter, and imager detective quantum efficiency (DQE). Each of these factors is incorporated into the ICRU-recommended figure of merit for image quality, the detectability index, which is maximized to determine the optimal sys...

The electronic stopping power of liquid water for protons over the 50 keV to 10 MeV energy range is studied using an improved dielectric response model which is in good agreement with the best available experimental data. The mean excitation energy (I) of stopping power theory is calculated to be 77.8 eV. Shell corrections are accounted for in a self-consistent manner through analytic dispersio...

We propose and analyze in detail a method to measure the in-air spatial spread parameter of clinical electron beams. Measurements are performed at the center of the beam and below the adjustable collimators sited in asymmetrical configuration in order to avoid distortions due to the presence of the applicator. The main advantage of our procedure lies in the fact that the dose profiles are fitte...

The purpose was to study correlations amongst IMRT DVH evaluation points and how their relaxation impacts the overall plan. 100 head-and-neck cancer cases, using the Eclipse treatment planning system with the same protocol, are statisti-cally analyzed for PTV, brainstem, and spinal cord. To measure variations amongst the plans, we use (i) interquartile range (IQR) of volume as a function of dos...

The Soft and Lung tissue equivalent substitute (STES LTES) were developed from urethane PMC121/30 Dry (A B) of Smooth-On, USA. part A B mixed in the ratio 1:1 further with calcium carbonate (CaCO3) at a 2:1 by mass. Air moisture was extracted mixture for 10minutes. This is STES density after air extraction 1.04gcm-3. LTES mixing polystyrene beads 10:1 0.25gcm-3 extraction. subjected to compress...

A readout of an appropriately calibrated individual dosemeter placed on the surface of the anthropomorphic phantom could be considered as a good approximation of the personal dose equivalent Hp(10) that is recommended by ICRP and ICRU as a conservative estimation of effective dose in radiation protection. The response of such a dosemeter as well as the effective dose are modelled by Monte Carlo...

Background: Cervical carcinoma is the fourth most common cancer and leading cause of related deaths in women worldwide. Brachytherapy an important part treatment cervical cancer. Delivering HDR Intracavitary Covid-19 era challenging. Objective: To compare dosimetry outcomes between two fractionation schedules 9Gy 2 fractions v/s 7Gy 3 high dose rate patients with locally advanced cervix. Method...