نتایج جستجو برای: energy ct

تعداد نتایج: 796208  

Journal: :Nutricion hospitalaria 2014
Raquel Duarte Moreira Alves Ana Paula Boroni Moreira Viviane Silva Macedo Neuza Maria Brunoro Costa Rita de Cássia Gonçalves Alfenas Josefina Bressan

BACKGROUND Evidences suggest that nuts consumption can improve energy metabolism. PURPOSE This study aimed to compare the effects of acute ingestion of high-oleic and conventional peanuts on appetite, food intake, and energy metabolism in overweight and obese men. METHODS Seventy one subjects (29.8 ± 2.4 kg/m2) were assigned to the groups: control (CT, n = 24); conventional peanuts (CVP, n ...

2016
Reza Mahmoudi Nasrollah Jabbari Mehdi aghdasi Hamid Reza Khalkhali

INTRODUCTION For accurate dose calculations, it is necessary to provide a correct relationship between the CT numbers and electron density in radiotherapy treatment planning systems (TPSs). The purpose of this study was to investigate the energy dependence of measured CT numbers on substituted materials used for CT number calibration of radiotherapy TPSs and the resulting errors in the treatmen...

Journal: :Journal of the American Chemical Society 2017
Koen Vandewal Johannes Benduhn Karl Sebastian Schellhammer Tim Vangerven Janna E Rückert Fortunato Piersimoni Reinhard Scholz Olaf Zeika Yeli Fan Stephen Barlow Dieter Neher Seth R Marder Jean Manca Donato Spoltore Gianaurelio Cuniberti Frank Ortmann

In disordered organic semiconductors, the transfer of a rather localized charge carrier from one site to another triggers a deformation of the molecular structure quantified by the intramolecular relaxation energy. A similar structural relaxation occurs upon population of intermolecular charge-transfer (CT) states formed at organic electron donor (D)-acceptor (A) interfaces. Weak CT absorption ...

Alireza Karimian, Arman Rahmim Mehdi Nasri Nasrabadi, Nematollah Ahmadi

Introduction: The CT machine utilizes a bowtie filter to shape the X-ray beam and remove lower energy photons. Configuration of this bowtie filter is complex and its geometry is often not available in detail. It causes the CT dose index (CTDI) be with the different values in measurement versus Monte Carlo simulation studies and other analytical calculations. It is important esp...

Journal: :Journal of radiological protection : official journal of the Society for Radiological Protection 2014
David John Platten

Existing data used to calculate the barrier transmission of scattered radiation from computed tomography (CT) are based on primary beam CT energy spectra. This study uses the EGSnrc Monte Carlo system and Epp user code to determine the energy spectra of CT scatter from four different primary CT beams passing through an ICRP 110 male reference phantom. Each scatter spectrum was used as a broad-b...

Journal: :Radiology 2016
Paul I Mallinson Tyler M Coupal Patrick D McLaughlin Savvas Nicolaou Peter L Munk Hugue A Ouellette

The principal advantages of dual-energy computed tomography (CT) over conventional CT in the musculoskeletal setting relate to the additional information provided regarding tissue composition, artifact reduction, and image optimization. This article discusses the manifestations of these in clinical practice-urate and bone marrow edema detection, metal artifact reduction, and tendon analysis, wi...

2006
Zhengrong Ying Ram Naidu Carl R. Crawford

Single energy computed tomography (CT) scanners use measurements of densities to detect explosives in luggage. It is desirable to apply dual energy techniques to these CT scanners to obtain atomic number measurements to reduce false alarm rates. However, the direct application of existing dual energy techniques has practical problems, such as, approximation errors and lack of boundary constrain...

Journal: :journal of dental research, dental clinics, dental prospects 0
farzaneh kaviani assistant professor, department of oral and maxillofacial radiology, faculty of dentistry tabriz university of medical science, tabriz, iran reza javadrashid assistant professor, department of radiology, faculty of medicine, tabriz university of medical science, tabriz, iran zahra shahmoradi post graduate student, department of oral and maxillofacial radiology, faculty of medical, tabriz university of medical science, tabriz, iran masoud gholamian post graduate student, department of radiology, faculty of medicine, tabriz university of medical science, tabriz, iran

background and aims. the imaging techniques commonly used for foreign body detection include plain radiography, xeroradiography, computed tomography (ct) scans, magnetic resonance imaging (mri) and ultrasonography. the aim of the present study was to compare cone-beam computed tomography (cbct) with conventional ct scan in determination of the exact location of a foreign body in the maxillofaci...

Journal: :asia oceania journal of nuclear medicine and biology 0
shigeru kosuda department of radiology, national defense medical college tsuneo saga molecular imaging center, national institute of radiological sciences diana paez nuclear medicine and diagnostic imaging, division of human health, department of nuclear sciences and applications, iaea

the c7-ras 6/061-004 training course by the international atomic energy agency/regional cooperative agreement (iaea/rca) was held in chiba in 2014. the syllabus, pre- and post-course evaluations, and survey questionnaire results were assembled in this course. the post-course evaluation, including 32 questions similar to the pre-course evaluation, was performed right after the end of the final e...

Journal: :The Cochrane database of systematic reviews 2013
Raoul Van Vugt Frederik Keus Digna Kool Jaap Deunk Michael Edwards

BACKGROUND Trauma is the fifth leading cause of death worldwide, and in people younger than 40 years of age, it is the leading cause of death. During the resuscitation of trauma patients at the emergency department, there are two different commonly used diagnostic strategies. Conventionally, there is the use of physical examination and conventional diagnostic imaging, potentially followed by se...

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