نتایج جستجو برای: ctac

تعداد نتایج: 135  

2013
Hsin-Hui Lee Jyh-Cheng Chen

The quantitative accuracy of SPECT is limited by photon attenuation and scatter effect when photons interact with atoms. In this study, we developed a new attenuation correction (AC) method, CT-based mean attenuation correction (CTMAC) method, and compared it with various methods that were often used currently to assess the AC phenomenon by using the small-animal SPECT/CT data that were acquire...

2007

The physical properties of ionic surfactants are very sensitive to the nature of the counterions. In particular, counterions that have a tendency to adsorb on the surfactant micelle are known to dramatically modify the viscoelastic properties of these solutions through the formation of long wormlike micelles [1, 2, 3, 4]. One extreme limit of an adsorbed counterion is an oppositely charged surf...

Journal: :Nanoscale 2015
C Y Song N Zhou B Y Yang Y J Yang L H Wang

The physicochemical properties of noble metal nanocrystals depend strongly on their size and shape, and it is becoming clear that the design and facile synthesis of particular nanostructures with tailored shape and size is especially important. Herein a novel class of hydrangea flower-like hierarchical gold nanostructures with tunable surface topographies and optical properties are prepared for...

Journal: :Organic & biomolecular chemistry 2012
Anand Natrajan David Sharpe David Wen

Chemiluminescent acridinium dimethylphenyl ester labels are used in automated immunoassays for clinical diagnostics. Light emission from these labels is triggered by alkaline peroxide in the presence of the cationic surfactant cetyltrimethylammonium chloride (CTAC). The surfactant plays a critical role in the chemiluminescence process of these labels by both accelerating their emission kinetics...

Journal: :Nanoscale 2016
Lei Zhang Qiaoli Chen Xue Wang Zhiyuan Jiang

The Au-Pd alloy has been proved to be an excellent catalyst in many applications, such as the electro-oxidation of formic acid, CO oxidation and oxidation of alcohols to aldehydes. However, most of the research has been focused on the shape-controlled Au-Pd alloy NCs with a single-crystal structure. Due to the existence of high-energy atoms on the twin defects, twinned structures usually will f...

Journal: :Journal of bacteriology 2011
Jessica R McCann Justin A McDonough Jonathan Tabb Sullivan Meghan E Feltcher Miriam Braunstein

The exported proteins of Mycobacterium tuberculosis that are localized at the bacterial cell surface or secreted into the environment are ideally situated to interact with host factors and to function in virulence. In this study, we constructed a novel β-lactamase reporter transposon and used it directly in M. tuberculosis for genome-wide identification of exported proteins. From 177 β-lactam-r...

Journal: :BMC Nephrology 2003
Niki Malliaraki Dimitris Mpliamplias Marilena Kampa Kostas Perakis Andrew N Margioris Elias Castanas

BACKGROUND Oxidative stress may play a critical role in the vascular disease of end stage renal failure and hemodialysis patients. Studies, analyzing either discrete analytes and antioxidant substances, or the integrated total antioxidant activity of human plasma during hemodialysis, give contradictory results. METHODS Recently, we have introduced a new automated method for the determination ...

Mohammad Reza Ay Saeed Sarkar

  The advent of dual-modality PET/CT imaging has revolutionized the practice of clinical oncology, cardiology and neurology by improving lesions localization and the possibility of accurate quantitative analysis. In addition, the use of CT images for CT-based attenuation correction (CTAC) allows to decrease the overall scanning time and to create a noise-free attenuat...

2016
Nobuhiro Yada Hideo Onishi

OBJECTIVES In this study, we aimed to validate the accuracy of computed tomography-based attenuation correction (CTAC), using the bilinear scaling method. METHODS The measured attenuation coefficient (μm) was compared to the theoretical attenuation coefficient (μt), using four different CT scanners and an RMI 467 phantom. The effective energy of CT beam X-rays was calculated, using the alumin...

2006
C Pettinato C Nanni M Farsad P Castellucci A Sarnelli S Civollani R Franchi S Fanti M Marengo C Bergamini

Positron emission tomography (PET) is a non-invasive imaging modality, which is clinically widely used both for diagnosis and accessing therapy response in oncology, cardiology and neurology.Fusing PET and CT images in a single dataset would be useful for physicians who could read the functional and the anatomical aspects of a disease in a single shot.The use of fusion software has been replace...

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