نتایج جستجو برای: scatter dose

تعداد نتایج: 321996  

2017
Sweet Ping Ng Ethan B Ludmir Manuel A Oyervides Richard Y Wu Steve Frank G Brandon Gunn

Cancers of the nasal cavity and septum are associated with poor prognosis and are usually treated with surgery followed by post-operative radiotherapy with or without concurrent chemotherapy. Definitive radiotherapy is used in cases where the tumor is unresectable, patient is unfit for surgery, and/or the patient declines surgical intervention. Here, we present a case of a patient, who for non-...

Mansour Zabihzadeh Zahra Farzanegan

Introduction: Cone beam computed tomography (CBCT) was introduced and became more common based on its low cost, fast image procedure rate and low radiation dose compared to CT. This imaging modality improved diagnostic and treatment-planning procedures by providing three-dimensional information with greatly reduced level of radiation dose compared to 2D dental imaging modalitie...

Journal: :Radiology 2005
Ehsan Samei Joseph Y Lo Terry T Yoshizumi Jonathan L Jesneck James T Dobbins Carey E Floyd H Page McAdams Carl E Ravin

PURPOSE To evaluate the scatter, dose, and effective detective quantum efficiency (DQE) performance of a slot-scan digital chest radiography system compared with that of a full-field digital radiography system. MATERIALS AND METHODS Scatter fraction of a slot-scan system was measured for an anthropomorphic and a geometric phantom by using a posterior beam-stop technique at 117 and 140 kVp. Me...

2002
D. M. DIMITRIADIS

This study describes the importance of attenuator scatter in the construction of compensators. The attenuator used in this study was Lipowitz metal, commonly referred to as cerrobend. Linear attenuation coefficients of cerrobend were measured in air for different thickness of cerrobend sheets and different field sizes for a 6-MV photon beam. The magnitude of the dose contribution from photons s...

2016
Silvia PANI James Scuffham

The purpose of this study is to investigate the use of hyperspectral X-ray imaging i.e, an imaging modality where spectral information on detected X-rays is available, for the removal of scatter in mammography. Features that suggest the presence of cancer are often low in contrast or small in size and therefore a good image quality is required in order to locate them. Current mammography system...

Journal: :Nihon Hoshasen Gijutsu Gakkai zasshi 2006
Hideki Kato

The anti-scatter grid is generally used as a way of eliminating scattered radiation from X-ray photographs. This does not change even if the detector system changes from an analogue system to a digital system such as the flat-panel detector. We developed a new method that uses software to eliminate scatter components from digital X-ray images taken without the use of an anti-scatter grid. With ...

2010

ID: 14214 Title: A novel scatter reduction and correction method to improve cone-beam CT (CBCT) image quality Purpose: To develop a novel scatter reduction and correction method to improve the CBCT image quality for IGRT applications. Method and Materials: A one-dimensional grid composed of lead with equal interspacing was positioned between the x-ray source and the imaging object during CBCT a...

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