Results 51 to 60 of about 277,928 (400)
Analysis of a Flexible Dual-Channel Octagonal Coil System for UHF MRI
IEEE Access, 2022 Nowadays, MRI is focused on using ultra-high static magnetic fields (>7 T) to increase the signal-to-noise ratio. The use of high fields, on the other hand, requires novel technical solutions as well as more stringent design criteria for specific ...
Nicola Curreli +8 more
doaj +1 more source
Wormholes supported by a phantom energy [PDF]
Phys.Rev. D71 (2005) 043520, 2005 We extend the notion of phantom energy--which is generally accepted for homogeneously distributed matter with $w<-1$ in the universe--on inhomogeneous spherically symmetric spacetime configurations. A spherically symmetric distribution of phantom energy is shown to be able to support the existence of static wormholes.
arxiv +1 more source
A Monte Carlo study of organ and effective doses of cone beam computed tomography (CBCT) scans in radiotherapy [PDF]
, 2017 Cone-beam CT (CBCT) scans utilized for image guided radiation therapy (IGRT) procedures have become an essential part of radiotherapy. The aim of this study was to assess organ and effective doses resulting from new CBCT scan protocols (head, thorax, and
Abuhaimed, Abdullah +2 more
core +1 more source
Can universe exit from phantom inflation due to gravitational back reaction? [PDF]
JCAP 0605 (2006) 008, 2006 The effects of the gravitational back reaction of cosmological perturbations are investigated in a phantom inflation model. The effective energy-momentum tensor of the gravitational back reaction of cosmological perturbations whose wavelengths are larger than the Hubble radius is calculated.
arxiv +1 more source
Optical phantoms for biomedical polarimetry: a review
Journal of Biomedical Optics, 2019 . Calibration, quantification, and standardization of the polarimetric instrumentation, as well as interpretation and understanding of the obtained data, require the development and use of well-calibrated phantoms and standards. We reviewed the status of
J. Chue-Sang +6 more
semanticscholar +1 more source
Healthcare Technology Letters, 2019 Accurate medical Augmented Reality (AR) rendering requires two calibrations, a camera intrinsic matrix estimation and a hand-eye transformation. We present a unified, practical, marker-less, real-time system to estimate both these transformations during ...
Megha Kalia +4 more
doaj +1 more source
Utilizing Additive Manufacturing to Produce Organ Mimics and Imaging Phantoms
Surgeries, 2023 The complex geometries and material properties necessary for generating accurate organ mimics require new procedures and methods to fully utilize current technologies.
Dmitri Karaman, Stephanie M. Willerth
doaj +1 more source
Phantom Black Holes and Sigma Models [PDF]
Phys.Rev.D83:124001,2011, 2011 We construct static multicenter solutions of phantom Einstein-Maxwell-dilaton theory from null geodesics of the target space, leading to regular black holes without spatial symmetry for certain discrete values of the dilaton coupling constant. We also discuss the three-dimensional gravitating sigma models obtained by reduction of phantom Einstein ...
arxiv +1 more source
3D microwave tomography with huber regularization applied to realistic numerical breast phantoms [PDF]
, 2016 Quantitative active microwave imaging for breast cancer screening and therapy monitoring applications requires adequate reconstruction algorithms, in particular with regard to the nonlinearity and ill-posedness of the inverse problem.
Bai, Funing +2 more
core +2 more sources
Suitability of low density materials for 3D printing of physical breast phantoms
Physics in Medicine and Biology, 2018 Breast physical phantoms are a basic tool for the assessment and verification of performance standards in daily clinical practice of x-ray breast imaging modalities.
D. Ivanov +11 more
semanticscholar +1 more source