نتایج جستجو برای: diagnostic reference level effective dose

تعداد نتایج: 2379398  

2014
Chang Woo Chun Bum-Soo Kim Cheol Hyoun Lee Yon Kwon Ihn Yong-Sam Shin

OBJECTIVE To assess patient radiation doses during cerebral angiography and embolization of intracranial aneurysms in a large sample size from a single center. MATERIALS AND METHODS We studied a sample of 439 diagnostic and 149 therapeutic procedures for intracranial aneurysms in 480 patients (331 females, 149 males; median age, 57 years; range, 21-88 years), which were performed in 2012 with...

2008
Claire-Louise Chapple

Over recent years there has been increasing concern over the level of radiation exposure to the population from diagnostic radiology, and this is particularly the case for paediatric radiology. In addition, many regulatory authorities place particular importance on the optimization of exposures to paediatric patients. This lecture aims to review and summarise the existing guidance for radiation...

ژورنال: سنجش و ایمنی پرتو 2020

Estimation of organ doses in diagnostic and therapeutic nuclear medicine procedures is an area of particular concern for radiation protection, in all over the world. The stylized computational phantoms have contributed significantly to radiation dosimetry in nuclear medicine; however, their simplified treatment of human anatomy is being criticized. Due to the fact that the ICRP adult reference ...

2014
Pavel Ryska Tomas Kvasnicka Jiri Jandura Ludovit Klzo Jakub Grepl Jan Zizka

Aims. To compare the effective and eye lens radiation dose in helical MDCT brain examinations using automatic tube current modulation in conjunction with either standard filtered back projection (FBP) technique or iterative reconstruction in image space (IRIS). Methods. Of 400 adult brain MDCT examinations, 200 were performed using FBP and 200 using IRIS with the following parameters: tube volt...

Journal: :International journal of cardiology 2013
Gianluca Pontone Daniele Andreini Erika Bertella Sarah Cortinovis Saima Mushtaq Claudia Foti Andrea Annoni Alberto Formenti Andrea Baggiano Edoardo Conte Giovanni Ballerini Cesare Fiorentini Antonio L Bartorelli Mauro Pepi

BACKGROUND The aims of this study are to evaluate the accuracy of low dose multidetector computed tomography coronary angiography (MDCT) versus invasive coronary angiography (ICA) in ruling out CAD in patients with mitral valve prolapse and severe mitral regurgitation (MVP) before cardiac surgery and to compare the overall effective radiation dose (ED) and cost of a diagnostic approach in which...

Introduction: In recent years, there has been increasing demand for personalized anatomy modeling for medical applications, because the influence of phantoms on the quality of treatments and precision dosimetry has been specified. Phantoms have many applications on medical such as treatment planning, diagnostic imaging, clinical radiological exposure simulation, and biomechanic...

2016
S. Gharbi S. Labidi M. Chelli F. Ladeb

The purpose of this study is to reduce radiation dose for chest CT examination by including Tube Current Modulation (TCM) to a standard CT protocol. A scan of an anthropomorphic male Alderson phantom was performed on a 128-slice scanner. The estimation of effective dose (ED) in both scans with and without mAs modulation was done via multiplication of Dose Length Product (DLP) to a conversion fa...

2013
Pavel Ryska Tomas Kvasnicka Jiri Jandura Ludovit Klzo Jakub Grepl Jan Zizka

Aims. To compare the effective and eye lens radiation dose in helical MDCT brain examinations using automatic tube current modulation in conjunction with either standard filtered back projection (FBP) technique or iterative reconstruction in image space (IRIS). Methods. Of 400 adult brain MDCT examinations, 200 were performed using FBP and 200 using IRIS with the following parameters: tube volt...

Journal: :iranian journal of medical physics 0
mohammad taghi bahreyni toossi medical physics research center, school of medicine, mashhad university of medical sciences, mashhad, iran department of medical physics, school of medicine, mashhad university of medical sciences, mashhad, iran

introduction computed tomography scans are a very important tool for diagnosis and assessment of response to treatment in the practice of medicine. ionizing radiation in medical imaging is undoubtedly one of the most powerful diagnostic tools in medicine. yet, as with all medical interventions, there are potential risks in addition to the clear potential benefits. materials and methods two refe...

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