Results 21 to 30 of about 1,442,765 (346)

Joint application of hybrid iterative reconstruction and adaptive filters on neck‐and‐shoulder CT imaging: A clinical evaluation

Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022
Abstract Purpose To assess whether the joint application of hybrid iterative reconstruction (HIR) and an adaptive filter (AF) could reduce streak artifacts and improve image quality of neck‐and‐shoulder computed tomography (CT). Methods This study included 96 patients with suspicious neck lesions who underwent a routine nonenhanced scan on a 64‐slice ...
Wenfeng Jin, Yifei Ma, Dan Han, Xiaojie Xie, Weiyuan Zhang, Yan Wu, Guozhi Zhang   +6 more
wiley   +1 more source

Treatment planning with a 2.5 MV photon beam for radiation therapy

Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022
Abstract Purpose The shallow depth of maximum dose and higher dose fall‐off gradient of a 2.5 MV beam along the central axis that is available for imaging on linear accelerators is investigated for treatment of shallow tumors and sparing the organs at risk (OARs) beyond it.
Navid Khaledi, Chris Hayes, Louise Belshaw, Mark Grattan, Rao Khan, James L. Gräfe   +5 more
wiley   +1 more source

Qubit decoherence by Gaussian low-frequency noise [PDF]

Journal of Experimental and Theoretical Physics Letters, 2004
4 pages, 2 ...
Dmitri V. Averin, Viktor Sverdlov, Viktor Sverdlov, Kristian Rabenstein   +3 more
openaire   +5 more sources

Impact of flexible noise control (FNC) image processing parameters on portable chest radiography

Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022
Abstract There is a lack of understanding in the performance of flexible noise control (FNC) processing, which is used in digital radiography on a scanner vendor and has four parameters each involving multiple options. The aim of this study was to investigate the impact of FNC on portable chest imaging. An anthropomorphic chest phantom was imaged using
Krystal M. Kirby, Liqiang Ren, Timothy R. Daly, Yasmeen K. Tandon, Brian J. Bartholmai, Beth A. Schueler, Zaiyang Long   +6 more
wiley   +1 more source

Effect of different noise reduction techniques and template matching parameters on markerless tumor tracking using dual‐energy imaging

Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022
Abstract Purpose To evaluate the impact of various noise reduction algorithms and template matching parameters on the accuracy of markerless tumor tracking (MTT) using dual‐energy (DE) imaging. Methods A Varian TrueBeam linear accelerator was used to acquire a series of alternating 60 and 120 kVp images (over a 180° arc) using fast kV switching, on ...
Mandeep Kaur, Peter Wagstaff, Hassan Mostafavi, Mathias Lehmann, Daniel Morf, Liangjia Zhu, Hyejoo Kang, Michal Walczak, Matthew M. Harkenrider, John C. Roeske   +9 more
wiley   +1 more source

Digital radiography image quality evaluation using various phantoms and software

Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022
Abstract Purpose To investigate the effect of the exposure parameters on image quality (IQ) metrics of phantom images, obtained automatically using software or from visual evaluation. Methods Three commercial phantoms and a homemade phantom constructed according to the instructions given in the IAEA Human Health Series No.
Ioannis A. Tsalafoutas, Shady AlKhazzam, Virginia Tsapaki, Huda AlNaemi, Mohammed Hassan Kharita   +4 more
wiley   +1 more source

Design of multi-channel low phase noise synchronous frequency source

Dianzi Jishu Yingyong, 2021
In order to meet the requirement of high stability frequency source when DRFM(Digital Radio Frequency Memory) system collects external input signals, a design method of multi-channel, low phase noise synchronous frequency source based on two-stage PLL is
Xu Wei, Pan Minghai, Zhang Yanjing
doaj   +1 more source

Low frequency noise in Josephson junctions [PDF]

IEEE Transactions on Magnetics, 1975
Using a high resolution SQUID voltmeter, we have measured the spectrum of low frequency voltage fluctuations across a thin-film Josephson tunnel junction biased at a constant current I greater than the junction critical current I c . We find that the frequency dependence of the voltage spectrum V^{2}(f) may be accurately represented by the power law V^{
Clarke, J., Hawkins, G.
openaire   +4 more sources

Effect of personality traits on sensitivity, annoyance and loudness perception of low- and high-frequency noise

Journal of Low Frequency Noise, Vibration and Active Control, 2021
This paper presents investigations into a comparative assessment of the effects of low- and high-frequency noise in relation to personality traits. The high- and low-frequency noises used are produced in the research laboratory using CoolEdit software ...
Milad Abbasi, Mohammad Osman Tokhi, Mohsen Falahati, Saeid Yazdanirad, Maryam Ghaljahi, Siavash Etemadinezhad, Roghayeh Jaffari Talaar Poshti   +6 more
doaj   +1 more source

A Proposal for Risk Assessment of Low-Frequency Noise in the Human–Machine–Environment System

Applied Sciences, 2023
Low-frequency noise, the frequency range from approximately 10 Hz to 200 Hz, has been recognized as a special environmental noise problem. The World Health Organization recognizes the special place of low-frequency noise as an environmental problem ...
Michaela Balážiková, Hana Pačaiová, Marianna Tomašková   +2 more
doaj   +1 more source