نتایج جستجو برای: CT number Linearity

تعداد نتایج: 1306030  

Introduction: One of the most valuable goals of phantoms, replacing with human goals in the field of research and quality control of diagnostic X-ray systems. There are various algorithms and methods for obtaining Homogeneity and CT number linearity for CT scan device. One of the most famous of these methods, the method is to use a uniform and homogeneous environment to comput...

C.H. Xie, D.Z. Jiang, H. Liu, J. Zhang, X.T. Huang, Y.F. Zhou, Z.R. Bao,

Background: Cone-beam computed tomography (CBCT) scanners for image-guided radiotherapy are in clinical use today, but there has been no consensus on uniform acceptance to verify the CBCT image quality yet. The present work proposed new methods to fully evaluate the performance of CBCT in its three-dimensional (3D) reconstruction space. Materials and Methods: Compared to the traditional methods...

Journal: :Medical physics 2012
J Fredriksson D Goodenough A Healy A Kristbjornsson S Kristinsson J Levy H Olafsdottir

PURPOSE With the development of RT treatment planning systems that use the relationship between CT number and Electron Density (ED), rather than the Linear Attenuation Coefficient (LAC) of a given material, a number of authors have pointed out the divergence between the linearity of CT numbers vs. LAC in the diagnostic range compared to the relationship between the CT number and ED. This paper ...

Journal: :Journal of biomedical physics & engineering 2023

Background: Methods for segmentation, i.e., Full-segmentation (FS) and Segmentation-rotation (SR), are proposed maintaining Computed Tomography (CT) number linearity. However, their effectiveness has not yet been tested against noise.Objective: This study aimed to evaluate the influence of noise on accuracy CT linearity FS SR methods American College Radiology (ACR) computational phantoms.Mater...

2018
Yvonne M C Henskens Anouk J W Gulpen René van Oerle Rick Wetzels Paul Verhezen Henri Spronk Simon Schalla Harry J Crijns Hugo Ten Cate Arina Ten Cate-Hoek

Background Traditional coagulation tests are included in emergency guidelines for management of patients on direct oral anticoagulants (DOACs) who experience acute bleeding or require surgery. We determined the ability of traditional coagulation tests and fast whole blood thromboelastography (ROTEM®) to screen for anticoagulation activity of dabigatran and rivaroxaban as low as 30 ng/mL. Meth...

Journal: :journal of biomedical physics and engineering 0
p mehnati ph.d., department of medical physics, school of medicine, tabriz university of medical sciences, tabriz, iran m jafari tirtash m.s. student, department of medical physics, school of medicine, tabriz university of medical sciences, tabriz, iran m ghavami department of radiology, school of medicine, tabriz university of medical sciences, tabriz, iran

normal 0 false false false en-us x-none ar-sa aim: ct number (hu) and linear attenuation coefficient contain useful information which  can be determined during usual ct scanning for the prediction of breast cancerous cells existence based on hemoglobin concentration. methods: this study used breast phantom containing major and minor vessels with diameters of 10 and 5 mm, respectively. the major...

C Anam, H Sutanto I Suyudi P Triadyaksa T Fujibuchi

Background: The HU linearity is an essential parameter in a quantitative imaging and the treatment planning systems of radiotherapy. Objective: This study aims to evaluate the linearity of Hounsfield unit (HU) in applying the adaptive iterative dose reduction (AIDR) on CT scanner and its comparison to the filtered back-projection (FBP).Material and Methods: In this experimental phan...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید