Results 121 to 130 of about 401,077 (355)

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

Noncommutative Projective Geometry

, 2001
This article describes recent applications of algebraic geometry to noncommutative algebra. These techniques have been particularly successful in describing graded algebras of small dimension.
openaire   +2 more sources

Projective geometries as projective modular lattices [PDF]

Transactions of the American Mathematical Society, 1979
It is shown that the lattice of subspaces of a finite dimensional vector space over a finite prime field is projective in the class of modular lattices provided the dimension is at least 4.
openaire   +2 more sources

Frege on intuition and objecthood in projective geometry. [PDF]

Synthese, 2021
Eder G.
europepmc   +1 more source

Quantitative beam optimization for radiotherapy of peripheral lung lesions: A pilot study in stereotactic body radiotherapy

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Background To quantify beam optimization for stereotactic body radiotherapy (SBRT) of peripheral lung lesions. Method The new beam optimization approach was based on maximizing the therapeutic gain (TG) of the beam set by minimizing the average physical depth of the lesion with respect to the beam's eye view (BEV).
Hamed Hooshangnejad, Jina Lee, Leslie Bell, Russell K. Hales, Khinh Ranh Voong, Sarah Han‐Oh, Kai Ding, Reza Farjam   +7 more
wiley   +1 more source

Improving the Reliability of Scale-Free Image Morphometrics in Applications with Minimally Restrained Livestock Using Projective Geometry and Unsupervised Machine Learning. [PDF]

Sensors (Basel), 2022
McVey C, Egger D, Pinedo P.
europepmc   +1 more source

Elementary Surprises in Projective Geometry [PDF]

arXiv, 2009
We discuss eight new(?) configuration theorems of classical projective geometry in the spirit of the Pappus and Pascal theorems.
arxiv  

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

A Dual of the Chow Transformation

Complex Manifolds, 2018
We define a dual of the Chow transformation of currents on the complex projective space. This transformation factorizes a left inverse of the Chow transformation and its composition with the Chow transformation is a right inverse of a linear diferential ...
Méo Michel
doaj   +1 more source

Rationality in Differential Algebraic Geometry [PDF]

arXiv, 2014
Parametric Cartan theory of exterior differential systems, and explicit cohomology of projective manifolds reveal united rationality features of differential algebraic geometry.
arxiv