Amaç: Bu çalışmanın amacı, Yoğunluk Ayarlı Radyoterapi (YART) planlarının hastaya özel kalite kontrolü için kullanılan film, in-vivo elektronik portal görüntüleme cihazları (Electronically Portal Imaging Devices-EPID) ve iki boyutlu (2B) detektörlerin hata tespit yeteneklerini karşılaştırmaktır. Yöntem: çalışmada, Alderson Rando fantom kullanılmıştır. İlk olarak, fantomun bilgisayarlı tomografi...

Introduction: Radiation therapy is one of the methods of cancer treatment. In this method, it is necessary to avoid harming the healthy tissues of the patient which is in the vicinity of the target, as much as possible. Treatment verification is one of the most important steps of radiation therapy which has two usual methods, using Port film and EPID. The accuracy and precision of treatment in ...

This study aimed to investigate direct and indirect correlations of methodologies bone quality analysis from brown egg layers, at final the production cycle. Twelve femurs Dekalb Brown laying hens, euthanized 85-week-old, were assessed evaluate breaking strength (BS), Seedor index (SI), mineral matter (MM), calcium (Ca) phosphorus (P) contents, besides cortical (CorD), medullar (MedD) epiphysis...

Download creatic cancer (PC) is a highly lethal disease with complex etiology involving both environmental netic factors. Although cigarette smoking is known to explain 25% of cases, data from recent studies sugat obesity and long-term type II diabetes are twomajor modifiable risk factors for PC. Furthermore, obed diabetes seem to affect the clinical outcome of patients with PC. Understanding t...

background: to correct patient positioning errors (setup errors) during prostate cancer treatment using epid and fiducial gold markers, to improve the accuracy of the dose delivery in these patients. materials and methods: fifteen patients with localized prostate carcinoma after implantation of fiducial gold markers in their prostate gland underwent the five-field imrt planning technique. the p...

OBJECTIVES AND AIM The objective of this study was to determine the origin of an arched back in cows during vaginal examination. Moreover, we tested whether the duration of an arched back and avoidance reactions during vaginal examination can be decreased by epidural anaesthesia or analgesic treatment. MATERIAL AND METHODS Behaviour during cleaning of the perivaginal region and during vaginal...

PURPOSE To investigate various issues for clinical implementation of aSi EPID panels for IMRT/VMAT QA. METHODS Six linacs are used in our clinic for EPID-based plan QA; two Varian Truebeams, two Varian 2100 series, two Elekta Infiniti series. Multiple corrections must be accounted for in the calibration of each panel for dosimetric use. Varian aSi panels are calibrated with standard dark fiel...

The problem of determining the in vivo dosimetry for patients undergoing radiation treatment has been an area of interest since the development of the field. More recent methods of measurement employ Electronic Portal Image Devices (EPID), or dosimeter arrays, for entrance or exit fluence determination. The more recent methods of in vivo dosimetry make use of detector arrays and reconstruction ...

Varian introduced (in 2010) the option of removing the flattening filter (FF) in their C-Arm linacs for intensity-modulated treatments. This mode, called flattening filter-free (FFF), offers the advantage of a greater dose rate. Varian's "Portal Dosimetry" is an electronic portal imager device (EPID)-based tool for IMRT verification. This tool lacks the capability of verifying flattening filter...

Introduction: The use of electronic portal imaging devices (EPIDs) is a method for the dosimetric verification of radiotherapy plans both pretreatment and in-vivo. The aim of this study was to test a 2D EPID-based dosimetry algorithm for dose verification of some plans inside a homogenous and anthropomorphic phantom and in-vivo, as well. Materials and Methods: </strong...