نتایج جستجو برای: ct number linearity

تعداد نتایج: 1306030  

Journal: :journal of biomedical physics and engineering 0
s. sina radiation research center, shiraz university, shiraz, iran. r. faghihi radiation research center, shiraz university, shiraz, iran a. s. meigooni nuclear engineering department, school of mechanical engineering, shiraz university, shiraz, iran.

background: the artificial neural networks (anns) are useful in solving nonlinear processes, without the need for mathematical models of the parameters. since the relationship between the ct numbers and material compositions is not linear, ann can be used for obtaining tissue density and composition. objective: the aim of this study is to utilize ann for determination of the composition and mas...

Journal: :Journal of nuclear medicine technology 2015
Akira Maebatake Maho Sato Ruriko Kagami Yasuo Yamashita Isao Komiya Kazuhiko Himuro Shingo Baba Masayuki Sasaki

UNLABELLED The aim of this study was to evaluate differences in dopamine transporter SPECT images among different SPECT/CT devices and to determine the most appropriate region of interest (ROI) for semiquantitative evaluation. METHODS An anthropomorphic striatal phantom was filled with (123)I solutions of different striatum-to-background radioactivity ratios. Data were acquired using 2 SPECT/...

Journal: :Japanese Journal of Radiological Technology 1997

2013
Caterina Ghetti Francesca Palleri Giulio Serreli Ornella Ortenzia Livia Ruffini

Recently a new iterative reconstruction algorithm named Iterative Reconstruction (SAFIRE) has been released by Siemens. This algorithm works in the raw data domain with noise reduction as main purpose, providing five different strengths. In this study, the effect of SAFIRE on image quality has been investigated using selected phantoms and a comparison with standard filtered back projection (FBP...

2011
MF Chan J Yang Y Song C Burman P Chan S Li

PURPOSE The imaging characteristics of two popular kV cone-beam CT (CBCT) and two MVCT systems utilised in image-guided radiation therapy (IGRT) were evaluated. MATERIALS AND METHODS The study was performed on Varian Clinac iX, Elekta Synergy S, Siemens Oncor, and Tomotherapy. A CT phantom (Catphan-504, Phantom Laboratory, Salem, NY) was scanned for measurements of image quality including ima...

Journal: :IEEE J. Emerg. Sel. Topics Circuits Syst. 2015
Arindam Sanyal Nan Sun

This paper presents techniques to address static and dynamic errors in high performance continuous-time (CT), modulators. The inter-symbol interference (ISI)model is presented and existing ISI reduction techniques are reviewed. A novel technique has been presented which can high-pass shape both static mismatch and ISI error of each element of a multi-bit DAC while decorrelating the instantaneou...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید