vahid karami - Academia.edu (original) (raw)

Papers by vahid karami

Research paper thumbnail of Gonad Shielding for Patients Undergoing Conventional Radiological Examinations: Is There Cause for Concern?

Jentashapir Journal of Health Research, 2016

Research paper thumbnail of Quality control of diagnostic radiology devices in the selected hospitals of Ahvaz city

Jentashapir Journal of Health Research, Nov 1, 2014

Background: X-ray, is one of the oldest, and yet the most widely used form of medical photographi... more Background: X-ray, is one of the oldest, and yet the most widely used form of medical photographing. X-ray is a valuable tool to diagnose and examine many diseases such as arthritis, spinal injuries, pneumonia, bronchitis and even cancer. Running a quality control program of the radiology devices can reduce the absorbed dose in the patients. The aim of this study is to take the quality control test on the diagnostic radiology devices in the selected hospitals of Ahvaz city. Materials and Methods: In this study various parameters of quality control programs were measured by the researchers, including voltage accuracy, accuracy of irradiation time, voltage repeatability, repeatability of irradiation time, output repeatability of X-ray tube, conformity of the optical field with radiation field, being the radiation field perpendicular to the film, the maximum leakage of tube and the light intensity of collimator. Results: Evaluating the voltage accuracy revealed that the radiology devices in the hospitals (A) and (C) fell below an acceptable standard. An Assessment of the maximum leakage of the tube showed that all selected radiology devices were of a good standard. Assessing the conformity of optical field with radiation field also showed that radiology devices fell below acceptable standard in the hospitals (D) and (C). Conclusion: In this study, all radiology devices in the selected educational hospitals of Ahvaz city made errors in some quality control tests except the radiology devices of hospital (B). The devices are required to be calibrated and their defects to be repaired.

Research paper thumbnail of Algorithm of Estimating Agricultural Water Consumption In Great River Basins Using Remote Sensing (Case Study: Karkheh River Basin, Iran)

Research paper thumbnail of The evaluation of conventional X- ray exposure parameters including tube voltage and exposure time in private and governmental hospitals of Lorestan province, Iran

In radiography, dose and image quality are dependent on radiographic parameters. The problem is c... more In radiography, dose and image quality are dependent on radiographic parameters. The problem is caused from incorrect use of radiography equipment and from the radiation exposure to patients much more than required. Therefore, the aim of this study was to implement a quality-control program to detect changes in exposure parameters, which may affect diagnosis or patient radiation dose.

Research paper thumbnail of Algorithm of Estimating Agricultural Water Consumption In Great River Basins Using Remote Sensing (Case Study: Karkheh River Basin, Iran)

Research paper thumbnail of Effects of different mycorrhiza species on grain yield, nutrient uptake and oil content of sunflower under water stress

Journal of the Saudi Society of Agricultural Sciences, 2014

Research paper thumbnail of Numerical performance analysis of oscillating water column device using sea waves

International Journal of Environmental Studies, 2014

ABSTRACT This study investigates the efficiency of an oscillating water column (OWC) wave energy ... more ABSTRACT This study investigates the efficiency of an oscillating water column (OWC) wave energy convertor using numerical simulation. For the OWC device, it was assumed that inertial water free-surface of the OWC acts as a floating rigid body. Hence, the radiation potential term is considered in the model. Analysis is performed in frequency domain based on linear wave theory and potential flow. The model was validated against experimental data based on output pressure. This comparison revealed that the model is accurate enough for this kind of simulation. Further investigations showed that outgoing air pressure increases with increase in the wave period. Furthermore, the output power of device reduces with increasing the submerged depth.

Research paper thumbnail of Gonad Shielding for Patients Undergoing Conventional Radiological Examinations: Is There Cause for Concern?

Jentashapir Journal of Health Research, 2016

Research paper thumbnail of Quality control of diagnostic radiology devices in the selected hospitals of Ahvaz city

Jentashapir Journal of Health Research, Nov 1, 2014

Background: X-ray, is one of the oldest, and yet the most widely used form of medical photographi... more Background: X-ray, is one of the oldest, and yet the most widely used form of medical photographing. X-ray is a valuable tool to diagnose and examine many diseases such as arthritis, spinal injuries, pneumonia, bronchitis and even cancer. Running a quality control program of the radiology devices can reduce the absorbed dose in the patients. The aim of this study is to take the quality control test on the diagnostic radiology devices in the selected hospitals of Ahvaz city. Materials and Methods: In this study various parameters of quality control programs were measured by the researchers, including voltage accuracy, accuracy of irradiation time, voltage repeatability, repeatability of irradiation time, output repeatability of X-ray tube, conformity of the optical field with radiation field, being the radiation field perpendicular to the film, the maximum leakage of tube and the light intensity of collimator. Results: Evaluating the voltage accuracy revealed that the radiology devices in the hospitals (A) and (C) fell below an acceptable standard. An Assessment of the maximum leakage of the tube showed that all selected radiology devices were of a good standard. Assessing the conformity of optical field with radiation field also showed that radiology devices fell below acceptable standard in the hospitals (D) and (C). Conclusion: In this study, all radiology devices in the selected educational hospitals of Ahvaz city made errors in some quality control tests except the radiology devices of hospital (B). The devices are required to be calibrated and their defects to be repaired.

Research paper thumbnail of Algorithm of Estimating Agricultural Water Consumption In Great River Basins Using Remote Sensing (Case Study: Karkheh River Basin, Iran)

Research paper thumbnail of The evaluation of conventional X- ray exposure parameters including tube voltage and exposure time in private and governmental hospitals of Lorestan province, Iran

In radiography, dose and image quality are dependent on radiographic parameters. The problem is c... more In radiography, dose and image quality are dependent on radiographic parameters. The problem is caused from incorrect use of radiography equipment and from the radiation exposure to patients much more than required. Therefore, the aim of this study was to implement a quality-control program to detect changes in exposure parameters, which may affect diagnosis or patient radiation dose.

Research paper thumbnail of Algorithm of Estimating Agricultural Water Consumption In Great River Basins Using Remote Sensing (Case Study: Karkheh River Basin, Iran)

Research paper thumbnail of Effects of different mycorrhiza species on grain yield, nutrient uptake and oil content of sunflower under water stress

Journal of the Saudi Society of Agricultural Sciences, 2014

Research paper thumbnail of Numerical performance analysis of oscillating water column device using sea waves

International Journal of Environmental Studies, 2014

ABSTRACT This study investigates the efficiency of an oscillating water column (OWC) wave energy ... more ABSTRACT This study investigates the efficiency of an oscillating water column (OWC) wave energy convertor using numerical simulation. For the OWC device, it was assumed that inertial water free-surface of the OWC acts as a floating rigid body. Hence, the radiation potential term is considered in the model. Analysis is performed in frequency domain based on linear wave theory and potential flow. The model was validated against experimental data based on output pressure. This comparison revealed that the model is accurate enough for this kind of simulation. Further investigations showed that outgoing air pressure increases with increase in the wave period. Furthermore, the output power of device reduces with increasing the submerged depth.