Results 31 to 40 of about 87,568 (329)
Positron-based attenuation correction for Positron Emission Tomography data using MCNP6 code
Journal of Radiation Research and Applied Sciences, 2016 This paper presents the Monte Carlo simulation of the attenuation correction for Positron Emission Tomography (PET) data using MCNP6 code. Two attenuation correction maps have been generated, one for correcting the attenuation effect in a homogeneous ...
M. Saeed +6 more
doaj +1 more source
Computational and Structural Biotechnology Journal, 2023 Background: To fully quantify arterial wall and plaque stiffness, acoustic radiation force impulse (ARFI)-induced wave-tracking along the entire vessel circumference is desired.
Judith T. Pruijssen +4 more
doaj +1 more source
IEEE Access, 2022 In this paper we deal with a simplified anisotropic rat head phantom development and the investigation of the influence of the anisotropic white matter on electroencephalogram source localization.
Jaroslav Lacik +7 more
doaj +1 more source
Patient-specific stopping power calibration for proton therapy planning based on single-detector proton radiography. [PDF]
, 2015 A simple robust optimizer has been developed that can produce patient-specific calibration curves to convert x-ray computed tomography (CT) numbers to relative stopping powers (HU-RSPs) for proton therapy treatment planning.
Bentefour, EH +5 more
core +1 more source
Topology, 1993 Let \(X\) be a connected CW-complex with finite skeletons \(X_ n\). A map on \(X\) is called a phantom map if its restriction to each \(X_ n\) is null-homotopic. The authors construct a phantom map \(\Theta:X\to{\overset\infty\bigvee}\Sigma X_ n\) which is universal, in the sense that every phantom map on \(X\) factors through \(\Theta\) up to homotopy.
Gray, Brayton, McGibbon, C.A.
openaire +1 more source
Frontiers in Cardiovascular Medicine, 2022 The goal of this work is to extend prior work on cardiac MR Fingerprinting (cMRF) using rosette k-space trajectories to enable simultaneous T1, T2, and proton density fat fraction (PDFF) mapping in the heart.
Yuchi Liu +6 more
doaj +1 more source
A Spectral CT Method to Directly Estimate Basis Material Maps From Experimental Photon-Counting Data [PDF]
, 2017 The proposed spectral CT method solves the constrained one-step spectral CT reconstruction (cOSSCIR) optimization problem to estimate basis material maps while modeling the nonlinear X-ray detection process and enforcing convex constraints on the basis ...
Barber, Rina Foygel +2 more
core +2 more sources
Design of a realistic PET-CT-MRI phantom [PDF]
, 2011 The validation of the PET image quality of new PET-MRI systems should be done against the image quality of currently available PET-CT systems. This includes the validation of new attenuation correction methods.
Espana Palomares, Samuel +4 more
core +1 more source
A Convex Reconstruction Model for X-ray Tomographic Imaging with Uncertain Flat-fields [PDF]
, 2017 Classical methods for X-ray computed tomography are based on the assumption that the X-ray source intensity is known, but in practice, the intensity is measured and hence uncertain.
Aggrawal, Hari Om +3 more
core +2 more sources
Deprojection of light distributions of nearby systems: perspective effect and non-uniqueness [PDF]
, 1999 Deriving the 3-dimensional volume density distribution from a 2-dimensional light distribution of a system yields generally non-unique results. The case for nearby dust-free systems is studied, taking into account the extra constraints from the ...
Arendt +17 more
core +2 more sources