Image quality and dose assessment of collimator slit width effect in SLOT-SCAN X-ray imaging system.

The effect of collimator slit width on patient absorbed dose and image quality is evaluated in the SLOT-SCAN imaging system. For this purpose, GATE Monte-Carlo code was used for simulation. To determine contrast to noise ratio (CNR), copper filters with different thicknesses were used and a 2mm lead filter was applied for the determination of the Modulation Transfer Function (MTF) and Detective Quantum Efficiency (DQE).

Evaluation of gamma and electron radiations impact on vitamins for onion preservation.

Food irradiation is a process in which food and other consumer products are exposed to gamma rays, X-rays or electron beams after extraction. This method is particularly important in order to reduce infectious agents and to extend the shelf life of the product. The target radiation is done with different devices, so self-sufficient radiation and panoramic radiation -including product and source overlap, planar and categorical radiation- is the major characteristics.

Design of band-pass filters in fluoroscopy by experimental and simulation methods for the 40 keV energy X-ray.

This study was carried out empirical computational and to design filters that while eliminating low-energy radiations according to the conventional methods attenuate high-energy beams that do not fundamentally affect images quality improvement and the absorbed patient dose reduction as well. In this regard, the impacts of thickness and filter material were examined on the contrast, resolution, absorbed patient dose, and image quality. We found that the use of filters increases the resolution, image quality and reduces the output dose intensity greatly, and the 0.

Spectroscopy and Optimizing Semiconductor Detector Data Under X and γ Photons Using Image Processing Technique.

Background: Spectroscopy is the study of the absorption and emission of light or other radiation by material. It is used to measure intensity of radiation by a function of wavelength.

Methods: The spectra of semiconductor detector cadmium tungstate from water, iron, lead, aluminum, and soft tissue targets were experimentally obtained through incident 1E-3 GeV X-ray and Co γ-ray and then optimized.

Development of a Synthetic Adaptive Neuro-Fuzzy Prediction Model for Tumor Motion Tracking in External Radiotherapy by Evaluating Various Data Clustering Algorithms.

In image guided radiotherapy, in order to reach a prescribed uniform dose in dynamic tumors at thorax region while minimizing the amount of additional dose received by the surrounding healthy tissues, tumor motion must be tracked in real-time. Several correlation models have been proposed in recent years to provide tumor position information as a function of time in radiotherapy with external surrogates. However, developing an accurate correlation model is still a challenge.