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Papers by nauman usmani

Computational Condensed Matter, 2021

Journal of Materials Engineering and Performance, 2021

Technology in Cancer Research & Treatment, 2006

The use of intensity modulated radiation therapy (IMRT) has been rapidly growing in the United St... more The use of intensity modulated radiation therapy (IMRT) has been rapidly growing in the United States. This technology is now being used in a multitude of academic and community centers throughout the country and is being incorporated into the treatment of cancers in almost every anatomical site, most commonly head and neck cancer, central nervous system tumors, and prostate cancer. In addition, current protocols are investigating the use of IMRT for the treatment of breast cancer, lung cancer, abdominal/retroperitoneal malignancies, and gynecological diseases. This article presents a brief technical review of IMRT and addresses specific clinical concerns and caveats that radiation oncologists should be aware of when utilizing this technology.

Journal of radiation research, 2014

Technical developments in radiotherapy (RT) have created a need for systematic quality assurance ... more Technical developments in radiotherapy (RT) have created a need for systematic quality assurance (QA) to ensure that clinical institutions deliver prescribed radiation doses consistent with the requirements of clinical protocols. For QA, an ideal dose verification system should be independent of the treatment-planning system (TPS). This paper describes the development and reproducibility evaluation of a Monte Carlo (MC)-based standard LINAC model as a preliminary requirement for independent verification of dose distributions. The BEAMnrc MC code is used for characterization of the 6-, 10- and 15-MV photon beams for a wide range of field sizes. The modeling of the LINAC head components is based on the specifications provided by the manufacturer. MC dose distributions are tuned to match Varian Golden Beam Data (GBD). For reproducibility evaluation, calculated beam data is compared with beam data measured at individual institutions. For all energies and field sizes, the MC and GBD agre...

International Journal of Medical Physics, Clinical Engineering and Radiation Oncology, 2014

standard LINAC model for quality assurance of multi-institutional

Journal of Materials Engineering and Performance

International Journal of Modern Physics B

Current research is a computational study in which we focus on calculating optical properties of ... more Current research is a computational study in which we focus on calculating optical properties of Eu-doped Cadmium Sulfide (CdS) system. We employ Perdew–Burke–Ernzerhof (PBE)–generalized gradient approximation (GGA) for accomplishment of our study and we assume various Eu concentrations (3.12%, 6.25% and 9.37%) for doping into host CdS lattice. We substitute Cd atoms with Eu atoms while supercell size is kept fixed ([Formula: see text]. We present a detailed comparison among optical properties of pure CdS and various Eu concentrations. Partial density of states (PDOS) plots reveal hybridization among Cd [Formula: see text]-states, S [Formula: see text]-states and Eu [Formula: see text]-states and because of it, material (CdS:Eu) shows exceptional energy transfer which influences optical spectra and electronic properties. A considerable change in absorption spectra is noted, where in comparison to pure CdS, absorption shows blueshift with increasing Eu concentrations. Our DFT results...

Materials Research Express