Results 61 to 70 of about 270,948 (219)

Quantifying Cross-scatter Contamination in Biplane Fluoroscopy Motion Analysis Systems [PDF]

open access: yes, 2015
Biplane fluoroscopy is used for dynamic in vivo three-dimensional motion analysis of various joints of the body. Cross-scatter between the two fluoroscopy systems may limit tracking accuracy. This study measured the magnitude and effects of cross-scatter
Cross, Janelle A.   +2 more
core   +2 more sources

Forward model for quantitative pulse-echo speed-of-sound imaging [PDF]

open access: yes, 2019
Computed ultrasound tomography in echo mode (CUTE) allows determining the spatial distribution of speed-of-sound (SoS) inside tissue using handheld pulse-echo ultrasound (US).
Frenz, Martin   +3 more
core   +2 more sources

Gravitational Lensing by Phantom Black holes [PDF]

open access: yes, 2012
In some models dark energy is described by phantom scalar fields (scalar fields with "wrong" sign of the kinetic term in the lagrangian). In the current paper we study the effect of phantom scalar field and/or phantom electromagnetic field on gravitational lensing by black holes in the strong deflection regime.
arxiv   +1 more source

A modular phantom and software to characterize 3D geometric distortion in MRI [PDF]

open access: yes, 2020
MRI offers outstanding soft tissue contrast that may reduce uncertainties in target and organ-at-risk delineation and enable online adaptive image-guided treatment. Spatial distortions resulting from non-linearities in the gradient fields and non-uniformity in the main magnetic field must be accounted for across the imaging field-of-view to prevent ...
arxiv   +1 more source

Digital mouse phantom for optical imaging

open access: yesJournal of Biomedical Optics, 2007
We present a method for design and use of a digital mouse phantom for small animal optical imaging. We map the boundary of a mouse model from magnetic resonance imaging (MRI) data through image processing algorithms and discretize the geometry by a finite element (FE) descriptor.
Shekhar Dwivedi   +2 more
openaire   +3 more sources

Super phantoms: advanced models for testing medical imaging technologies

open access: yesCommunications Engineering
Phantoms are test objects used for initial testing and optimization of medical imaging techniques, but these rarely capture the complex properties of the tissue.
Srirang Manohar   +4 more
doaj   +1 more source

Realistic 3D printed imaging tumor phantoms for validation of image processing algorithms [PDF]

open access: yesarXiv, 2022
Medical imaging phantoms are widely used for validation and verification of imaging systems and algorithms in surgical guidance and radiation oncology procedures. Especially, for the performance evaluation of new algorithms in the field of medical imaging, manufactured phantoms need to replicate specific properties of the human body, e.g., tissue ...
arxiv  

Mechanically Powered Motion Imaging Phantoms: Proof of Concept [PDF]

open access: yes, 2019
Motion imaging phantoms are expensive, bulky and difficult to transport and set-up. The purpose of this paper is to demonstrate a simple approach to the design of multi-modality motion imaging phantoms that use mechanically stored energy to produce motion. We propose two phantom designs that use mainsprings and elastic bands to store energy.
arxiv   +1 more source

Accurate molecular imaging of small animals taking into account animal models, handling, anaesthesia, quality control and imaging system performance [PDF]

open access: yes, 2015
Small-animal imaging has become an important technique for the development of new radiotracers, drugs and therapies. Many laboratories have now a combination of different small-animal imaging systems, which are being used by biologists, pharmacists ...
Bankstahl, Jens   +5 more
core   +1 more source

Silicone phantoms fabricated with multi-material extrusion 3D printing technology mimicking imaging properties of soft tissues in CT [PDF]

open access: yesarXiv, 2022
Recently, 3D printing has been widely used to fabricate medical imaging phantoms. So far, various rigid 3D printable materials have been investigated for their radiological properties and efficiency in imaging phantom fabrication. However, flexible, soft tissue materials are also needed for imaging phantoms, which are used in various scenarios, such as
arxiv  

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