A major factor affecting fresh pork quality is the implementation of management technologies that improve market swine movement during the loading process for transport to the packing plant. An experiment was conducted to evaluate the effect of loading system at the farm (traditional chute with no handling delay vs. prototype loading gantry with handling delay) on the fresh quality pork loin. P...

BACKGROUND Carbon fiber (CF) is now the material of choice for radiation therapy couch tops. Initial designs included side metal bars for rigidity; however, with the advent of IGRT, involving on board imaging, new thicker CF couch tops without metal bars have been developed. The new design allows for excellent imaging at the expense of potentially unacceptable dose attenuation and perturbation....

PURPOSE The aim of this work was to comprehensively evaluate a new large field ion chamber transmission detector, Integral Quality Monitor (IQM), for online external photon beam verification and quality assurance. The device is designed to be mounted on the linac accessory tray to measure and verify photon energy, field shape, gantry position, and fluence before and during patient treatment. ...

Experimental methods are commonly used for patient-specific IMRT delivery verification. There are a variety of IMRT QA techniques which have been proposed and clinically used with a common understanding that not one single method can detect all possible errors. The aim of this work was to compare the efficiency and effectiveness of independent dose calculation followed by machine log file analy...

Abstract Load swaying is one of the most frequently occurring problems at production sites. The purpose this work to create a control system for movement an overhead crane with anti-sway function. Particle Swarm Optimization method has been used find controller coefficients. function should be implemented using PLC (programmable logic controller) and have high speed operation. frequency convert...

The aim of this study was to assess the performance of a gantry-mounted detector system and a couch set detector system using a systematic multileaf collimator positional error manually introduced for volumetric-modulated arc therapy. Four head and neck and esophagus VMAT plans were evaluated by measurement using an electronic portal imaging device and an ion chamber array. Each plan was copied...

OBJECTIVE This study was designed to optimize the scan protocol of CT angiography to reduce diaphragmatic motion artifacts in pediatric patients with free-breathing. MATERIALS AND METHODS A phantom with twelve tubes with different diameters was constructed. To simulate free-breathing, the phantom was connected to a motor, and the phantom moved along the axis of scan. Scans were performed unde...

Background: This paper aimed to analyze the output constancy of a medical linear accelerator using PTW QUICKCHECKwebline and studied the sensitivity of the PTW QUICKCHECKwebline. Materials and Methods:  The paper statistically analyzed the output doses of 6 MV and 10 MV of photons and 6 MeV, 9 MeV, and 12 MeV of electrons from a medical linear accelerator measured before the daily treatment to ...

minor repositioning errors in connection with sharp density gradients in the beam path or changes in the physical condition of the patient. To quantify such deviations from PET data, improved attenuation, scatter [2] and random [3] correction methods for the measured data as well as refined models (positron range, photon scattering) for predicting the β-activity distribution from the treatment ...