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40. Page 6. pHoenix XL User Guide | 4. A. Description. The Mesa Labs pHoenix XL Meter is designed to help you quickly and easily check the conductivity, pH and ...

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Objective: The aim of this study was to investigate low-dose kilovoltage cone-beam CT (kV-CBCT) for image-guided radiotherapy, with a particular focus on the accuracy of image registration with low-dose protocols. Methods: Imaging doses were measured with a NOMEX semiconductor detector positioned at the front of head, thorax, and pelvis human body phantoms while kV-CBCT scans were acquired at different tube currents. Aspects of image quality (spatial resolution, noise, uniformity, contrast, geometric distortion, and Hounsfield unit sensitivity) and image registration accuracy using bone and soft tissue were evaluated. Results: With preset and the lowest tube currents, the imaging doses were 0.16 and 0.08 mGy, 5.29 and 2.80 mGy, and 18.23 and 2.69 mGy for head, thorax, and pelvis, respectively. Noise was the only quality aspect directly dependent on tube current, being increased by 1.5 times with a tube current half that of the preset in head and thorax, and by 2.2 times with a tube ...

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2010

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ABSTRACT Objective The aim of this work was to quantify the extent of set-up errors to conduct a quality assurance (QA) aspect of treatment delivery, verification of the treatment field’s position on different days using electronic portal. Methods This study was carried out on 12 patients, treated for pelvis tumor; and total of 240 images obtained by electronic portal image device (EPID) were analyzed. The EPIs acquire using EPID attached to the Siemens linear accelerator. The anatomy matching software (Theraview) was used and displacement in two dimensions were noted for each treatment field to study patient setup errors. Results The percentages of mean deviations less than 5 mm in X direction were 65% & 92%, from 5–10 mm were 31% & 19% and more than 10 mm were 11% & 9% for A/P and lateral direction respectively. The percentages of mean deviations less than 5 mm in Y direction were 65% & 63%, from 5–10 mm were 33% & 28% and more than 10 mm were 22% & 29%. The mean deviations in 2D-vector errors were ≤ 5 mm in 47% and 46%, 5–10 mm in 36% and 37% and > 10 mm in 37% and 37% of images in the A/P and lateral direction respectively. Conclusion The results revealed that the ranges of set up errors are immobilization method to improve reproducibility. The observed variations were not within the limits.

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Reports of practical oncology and radiotherapy : journal of Greatpoland Cancer Center in Poznan and Polish Society of Radiation Oncology