نتایج جستجو برای: thorax phantom

تعداد نتایج: 24331  

2016
Andrew P. Santoso Kwang H. Song Yujiao Qin Stephen J. Gardner Chang Liu Indrin J. Chetty Benjamin Movsas Munther Ajlouni Ning Wen

BACKGROUND This study investigates the effect of gantry speed on 4DCBCT image quality and dose for the Varian On-Board Imager®. METHODS A thoracic 4DCBCT protocol was designed using a 125 kVp spectrum. Image quality parameters were evaluated for 4DCBCT acquisition using Catphan® phantom with real-time position management™ system for gantry speeds varying between 1.0 to 6.0°/s. Superior-inferi...

Journal: :Acta oncologica 2015
Patrik Sibolt Wiviann Ottosson David Sjöström Christina Larsen Claus F Behrens

BACKGROUND Radiotherapy of lung cancer patients is subject to uncertainties related to heterogeneities, anatomical changes and breathing motion. Use of deep-inspiration breath-hold (DIBH) can reduce the treated volume, potentially enabling dose-escalated (DE) treatments. This study was designed to investigate the need for adaptation due to anatomical changes, for both standard (ST) and DE plans...

Journal: :Notfallmedizin up2date 2015

Journal: :Thorax 2003

Journal: :Thorax 2006

Journal: :Indian Journal of Radiology and Imaging 2006

Journal: :Thorax 2006

Journal: :Medical image analysis 2017
Yubing Tong Jayaram K. Udupa Krzysztof Ciesielski Caiyun Wu Joseph M. McDonough David A. Mong Robert M. Campbell

PURPOSE Dynamic or 4D imaging of the thorax has many applications. Both prospective and retrospective respiratory gating and tracking techniques have been developed for 4D imaging via CT and MRI. For pediatric imaging, due to radiation concerns, MRI becomes the de facto modality of choice. In thoracic insufficiency syndrome (TIS), patients often suffer from extreme malformations of the chest wa...

Journal: :iranian journal of radiation research 0
m. zehtabian medical radiation department and medical imaging research center, school of engineering, shiraz university, shiraz, iran r. faghihi medical radiation department and medical imaging research center, school of engineering, shiraz university, shiraz, iran m.a. mosleh-shirazi center for research in medical physics and biomedical engineering and physics unit, radiotherapy department, namazi hospital, shiraz university of medical sciences, shiraz, iran a.r. shakibafard radiology department, shiraz university of medical sciences, shiraz, iran m. mohammadi medical physics department, royal adelaide hospital, adelaide, australia m. baradaran-ghahfarokhi medical physics and medical engineering department, school of medicine, isfahan university of medical sciences, isfahan, iran

background: the aim of this work was to study the feasibility of constructing a fast thorax model suitable for simulating lung motion due to respiration using only one ct dataset. materials and methods: for each of six patients with different thorax sizes, two sets of ct images were obtained in single-breath-hold inhale and exhale stages in the supine position. the ct images were then analyzed ...

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