Results 101 to 110 of about 1,044,520 (358)

Exploring the application of dual‐energy CT to discriminate sediment facies in a varved sequence

The Depositional Record
Dual‐energy X‐ray computed tomography consists of imaging objects using two incident X‐ray beams of different energy to distinguish the different compounds within a sample based on their density (electron density, ρe) and elemental composition (effective
M. Martini, P. Francus, L. Di Schiavi Trotta, P. Letellier, M. Des Roches, P. Després   +5 more
doaj   +1 more source

Dark-field chest x-ray imaging: first experience in patients with alpha1-antitrypsin deficiency

European Radiology Experimental, 2022
Background Spirometry and conventional chest x-ray have limitations in investigating early emphysema, while computed tomography, the reference imaging method in this context, is not part of routine patient care due to its higher radiation dose.
Gregor S. Zimmermann, Alexander A. Fingerle, Bernhard Renger, Karl-Ludwig Laugwitz, Hubert Hautmann, Andreas Sauter, Felix Meurer, Florian Tilman Gassert, Jannis Bodden, Christina Müller-Leisse, Martin Renz, Ernst J. Rummeny, Marcus R. Makowski, Konstantin Willer, Wolfgang Noichl, Fabio De Marco, Manuela Frank, Theresa Urban, Rafael C. Schick, Julia Herzen, Thomas Koehler, Bernhard Haller, Daniela Pfeiffer, Franz Pfeiffer   +23 more
doaj   +1 more source

Measurement of CT radiation beam width with a pencil ionization chamber and radiopaque mask

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Purpose This study compares fan beam CT scanner radiation beam widths measured with a pencil ionization chamber‐radiopaque mask technique with commonly used film and computed radiography (CR) measurements. Methods For a given fan beam CT scanner x‐ray beam, the ionization chamber‐mask technique determines the radiation beam width by exposing a
Rani Al‐Senan, David M. Gauntt, Gary T. Barnes   +2 more
wiley   +1 more source

X-Ray Computed Tomography In Situ: An Opportunity for Museums and Restoration Laboratories

The Heritage, 2019
X-ray Computed Tomography (X-ray CT) is a sophisticated non-destructive imaging technique to investigate structures and materials of complex objects, and its application can answer many conservation and restoration questions.
F. Albertin, M. Bettuzzi, R. Brancaccio, M. Morigi, F. Casali   +4 more
semanticscholar   +1 more source

Modelling of a double‐scattering proton therapy nozzle using the FLUKA Monte Carlo code and analysis of linear energy transfer in patients treated for prostate cancer

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Background The dose‐averaged linear energy transfer (LETD) in proton therapy (PT) has in pre‐clinical studies been linked to the relative biological effectiveness (RBE) of protons. Until recently, the most common PT delivery method in prostate cancer has been double‐scattered PT, with LETD only available through dedicated Monte Carlo (MC ...
Rasmus Klitgaard, Lars Fredrik Fjæra, Camilla Hanquist Stokkevåg, Perry Johnson, Mark Artz, Nancy Price Mendenhall, Curtis Bryant, Ludvig Paul Muren   +7 more
wiley   +1 more source

An Investigation of Hydrate Formation in Unsaturated Sediments Using X‐Ray Computed Tomography

Journal of Geophysical Research: Solid Earth, 2019
Physical properties of hydrate‐bearing sediments are often correlated with hydrate saturation with little or no information on hydrate distribution uniformity in the specimens.
L. Lei, Zhichao Liu, Y. Seol, R. Boswell, S. Dai   +4 more
semanticscholar   +1 more source

X-ray ghost tomography: denoising, dose fractionation and mask considerations [PDF]

IEEE Transactions on Computational Imaging 5, 136-149 (2019), 2018
Ghost imaging has recently been successfully achieved in the X-ray regime; due to the penetrating power of X-rays this immediately opens up the possibility of X-ray ghost tomography. No research into this topic currently exists in the literature. Here we present adaptations of conventional tomography techniques to this new ghost imaging scheme. Several
arxiv  

Feasibility study of skin dosimetry with TLD sheets for measuring the effect of 3D printed bolus in radiotherapy

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract The thermoluminescence dosimeter (TLD) sheet is a measurement device coated with manganese‐doped LiB3O5 in sheet form. The sheet is 0.2‐mm thick and flexible. Hence, it can fit and be installed on irregular surfaces. The current study aimed to evaluate the feasibility of measuring patient surface doses during radiation therapy using TLD sheets.
Yuya Miyasaka, Mayumi Ichikawa, Takagi Akira, Yoshifumi Yamazawa, Hongbo Chai, Hikaru Souda, Miyu Ishizawa, Hiraku Sato, Takeo Iwai   +8 more
wiley   +1 more source

The Theory of Diffraction Tomography [PDF]

arXiv, 2015
Tomography is the three-dimensional reconstruction of an object from images taken at different angles. The term classical tomography is used, when the imaging beam travels in straight lines through the object. This assumption is valid for light with short wavelengths, for example in x-ray tomography.
arxiv  

Automatic skin flash optimization in breast and chestwall VMAT with static angle modulated ports: Effect of HU and flash margin size on plan quality and robustness

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Skin flash is typically added to breast and chestwall plans to ensure robust target coverage in the presence of respiratory motion, anatomic changes, and small setup uncertainties. Adding skin flash in volumetric modulated arc therapy (VMAT) plans is an iterative and manual process.
Emily Hubley, Brandon Koger, Taoran Li, Michael Salerno, Ryan M. Scheuermann, Lei Dong, Boon‐Keng Kevin Teo   +6 more
wiley   +1 more source