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Papers by Om Prakash Gurjar

Research paper thumbnail of Dosimetric Study of an Indigenous and Heterogeneous Pelvic Phantom for Radiotherapy Quality Assurance

Iranian Journal of Medical Physics, 2020

Introduction: In vitro dosimetric verification prior to patient treatment plays a key role in acc... more Introduction: In vitro dosimetric verification prior to patient treatment plays a key role in accurate and precision radiotherapy treatment delivery. Since the human body is a heterogeneous medium, the aim of this study was to design a heterogeneous pelvic phantom for radiotherapy quality assurance. Material and Methods: A pelvic phantom was designed using wax, pelvic bone, borax powder, and water mimicking different biological tissues. Hounsfield units and relative electron densities were measured. Various intensity-modulated radiotherapy (IMRT) plans were imported to the pelvic phantom for verification and implemented on the Delta 4 phantom. The quantitative evaluation was performed in terms of dose deviation, distance to agreement, and gamma index passing rate. Results: According to the results of the CT images of an actual patient, relative electron densities for bone, fat, air cavity, bladder, and rectum were 1.335, 0.955, 0.158, 1.039, and 1.054, respectively. Moreover, the CT...

Research paper thumbnail of Point Dose Measurement for Verification of Treatment Planning System using an Indigenous Heterogeneous Pelvis Phantom for Clarkson, Convolution, Superposition, and Fast Superposition Algorithms

Journal of Biomedical Physics and Engineering, 2019

Background: Nowadays, advanced radiotherapy equipment includes algorithms to calculate dose. The ... more Background: Nowadays, advanced radiotherapy equipment includes algorithms to calculate dose. The verification of the calculated doses is important to achieve accurate results. Mostly homogeneous dosimetric phantoms are available commercially which do not mimic the actual patient anatomy; therefore, an indigenous heterogeneous pelvic phantom mimicking actual human pelvic region has been used to verify the doses calculated by different algorithms.Objective: This study aims to compare the planed dose using different algorithms with measured dose using an indigenous heterogeneous pelvic phantom.Material and Methods: Various three dimensional conformal radiotherapy (3D-CRT) plans were made using different dose calculated by algorithms. The plans were delivered by medical linear accelerator and doses were measured by ion chamber placed in the indigenous pelvic phantom. Planned and measured doses were compared with together and analyzed.Results: The relative electron densities of different...

Research paper thumbnail of Effects of sewage wastewater irrigation compare to ground water irrigation on soil physico-chemical properties

International Journal of Chemical Studies, 2017

Today, due to the constraint in availability of the freshwater for irrigation, waste water especi... more Today, due to the constraint in availability of the freshwater for irrigation, waste water especially sewage water is being used for irrigation of agriculture fields. Experiment was conducted form crop cultivation field by using sewage water. These fields were irrigated with sewage waste water. Use of the domestic waste water with fertilizers has shown the improvement in the physico-chemical properties of the soil. The domestic wastewater irrigation applied for a season had no significant effects apart from, slight changes in salt solubility and alkalinity on soil with sewage wastewater irrigation. The sewage waste water irrigated field soil was analyzed to study the soil physico-chemical properties. Soil samples were collected from four different locations in Bhilwara region and various parameters were analyzed viz., pH, EC, BD, PD, WHC, OC, Nitrogen, Phosphorus, Potassium, Calcium, Magnesium and Sulphur. The samples were found to contain mean of pH 7.49, EC 0.84 dSm, OC 0.79 %, N ...

Research paper thumbnail of Dosimetric Study of an Indigenous and Heterogeneous Pelvic Phantom for Radiotherapy Quality Assurance

Iranian Journal of Medical Physics, 2020

Introduction: In vitro dosimetric verification prior to patient treatment plays a key role in acc... more Introduction: In vitro dosimetric verification prior to patient treatment plays a key role in accurate and precision radiotherapy treatment delivery. Since the human body is a heterogeneous medium, the aim of this study was to design a heterogeneous pelvic phantom for radiotherapy quality assurance. Material and Methods: A pelvic phantom was designed using wax, pelvic bone, borax powder, and water mimicking different biological tissues. Hounsfield units and relative electron densities were measured. Various intensity-modulated radiotherapy (IMRT) plans were imported to the pelvic phantom for verification and implemented on the Delta 4 phantom. The quantitative evaluation was performed in terms of dose deviation, distance to agreement, and gamma index passing rate. Results: According to the results of the CT images of an actual patient, relative electron densities for bone, fat, air cavity, bladder, and rectum were 1.335, 0.955, 0.158, 1.039, and 1.054, respectively. Moreover, the CT...

Research paper thumbnail of Point Dose Measurement for Verification of Treatment Planning System using an Indigenous Heterogeneous Pelvis Phantom for Clarkson, Convolution, Superposition, and Fast Superposition Algorithms

Journal of Biomedical Physics and Engineering, 2019

Background: Nowadays, advanced radiotherapy equipment includes algorithms to calculate dose. The ... more Background: Nowadays, advanced radiotherapy equipment includes algorithms to calculate dose. The verification of the calculated doses is important to achieve accurate results. Mostly homogeneous dosimetric phantoms are available commercially which do not mimic the actual patient anatomy; therefore, an indigenous heterogeneous pelvic phantom mimicking actual human pelvic region has been used to verify the doses calculated by different algorithms.Objective: This study aims to compare the planed dose using different algorithms with measured dose using an indigenous heterogeneous pelvic phantom.Material and Methods: Various three dimensional conformal radiotherapy (3D-CRT) plans were made using different dose calculated by algorithms. The plans were delivered by medical linear accelerator and doses were measured by ion chamber placed in the indigenous pelvic phantom. Planned and measured doses were compared with together and analyzed.Results: The relative electron densities of different...

Research paper thumbnail of Effects of sewage wastewater irrigation compare to ground water irrigation on soil physico-chemical properties

International Journal of Chemical Studies, 2017

Today, due to the constraint in availability of the freshwater for irrigation, waste water especi... more Today, due to the constraint in availability of the freshwater for irrigation, waste water especially sewage water is being used for irrigation of agriculture fields. Experiment was conducted form crop cultivation field by using sewage water. These fields were irrigated with sewage waste water. Use of the domestic waste water with fertilizers has shown the improvement in the physico-chemical properties of the soil. The domestic wastewater irrigation applied for a season had no significant effects apart from, slight changes in salt solubility and alkalinity on soil with sewage wastewater irrigation. The sewage waste water irrigated field soil was analyzed to study the soil physico-chemical properties. Soil samples were collected from four different locations in Bhilwara region and various parameters were analyzed viz., pH, EC, BD, PD, WHC, OC, Nitrogen, Phosphorus, Potassium, Calcium, Magnesium and Sulphur. The samples were found to contain mean of pH 7.49, EC 0.84 dSm, OC 0.79 %, N ...