Results 21 to 30 of about 87,568 (329)

Standard MRI-based attenuation correction for PET/MRI phantoms: a novel concept using MRI-visible polymer

EJNMMI Physics, 2021
Background PET/MRI phantom studies are challenged by the need of phantom-specific attenuation templates to account for attenuation properties of the phantom material.
Ivo Rausch, Alejandra Valladares, Lalith Kumar Shiyam Sundar, Thomas Beyer, Marcus Hacker, Martin Meyerspeer, Ewald Unger   +6 more
doaj   +1 more source

Equivariant Phantom Maps

Publications of the Research Institute for Mathematical Sciences, 1988
This paper contains a study of the characterization of the equivariant phantom maps by means of the equivariant localization and the equivariant completion. The equivariant integral approximation and the equivariant Miller-Zabrodsky theorem will be used to describe the homotopy set of the equivariant phantom maps by the equivariant cohomology groups.
Nobuyuki Oda, Yoshimi Shitanda
openalex   +4 more sources

Panorama mapping of the colon – a phantom study with robotic endoscopy

Current Directions in Biomedical Engineering, 2022
When documenting colonoscopic examinations, the challenge arises, that the exact location of the detected lesions (such as polyps) can usually only be determined with low precision.
Hackner Ralf, Eixelberger Thomas, Wittenberg Thomas   +2 more
doaj   +1 more source

Phantom maps and purity in modular representation theory, I [PDF]

Algebras and Representation Theory, 1999
[For part I see Fundam. Math. 161, No. 1-2, 37-91 (1999; Zbl 0944.20004).] The authors produce examples of filtered systems in the stable module category of \(kG\) which do not lift to filtered systems in the module category of \(kG\); here \(kG\) denotes the group algebra of a finite group \(G\) over a field of characteristic \(p>0\).
David J. Benson, Gilles Gnacadja
openalex   +4 more sources

A multi-purpose phantom kit for magnetic particle imaging

Current Directions in Biomedical Engineering, 2021
Phantoms are essential tools for the development and characterization of Magnetic Particle Imaging (MPI), an imaging technique that can quantitatively map the spatial distribution of magnetic nanoparticles (MNP).
Löwa Norbert, Hoffmann Rebecca, Gutkelch Dirk, Kosch Olaf, Dutz Silvio, Wiekhorst Frank   +5 more
doaj   +1 more source

Pixel-wise reconstruction of tissue absorption coefficients in photoacoustic tomography using a non-segmentation iterative method

Photoacoustics, 2022
In Photoacoustic Tomography (PAT), the acquired image represents a light energy deposition map of the imaging object. For quantitative imaging, the PAT image is converted into an absorption coefficient (μa) map by dividing the light fluence (LF ...
Shuangyang Zhang, Jiaming Liu, Zhichao Liang, Jia Ge, Yanqiu Feng, Wufan Chen, Li Qi   +6 more
doaj   +1 more source

Sensory Feedback in Hand Prostheses: A Prospective Study of Everyday Use

Frontiers in Neuroscience, 2020
IntroductionSensory feedback in hand prostheses is lacking but wished for. Many amputees experience a phantom hand map on their residual forearm. When the phantom hand map is touched, it is experienced as touch on the amputated hand.
Ulrika Wijk, Ulrika Wijk, Ingela K. Carlsson, Ingela K. Carlsson, Christian Antfolk, Anders Björkman, Anders Björkman, Birgitta Rosén, Birgitta Rosén   +8 more
doaj   +1 more source

Deep Learning-Based Internal Target Volume (ITV) Prediction Using Cone-Beam CT Images in Lung Stereotactic Body Radiotherapy

Technology in Cancer Research & Treatment, 2022
Purpose: This study aims to develop a deep learning (DL)-based (Mask R-CNN) method to predict the internal target volume (ITV) in cone beam computed tomography (CBCT) images for lung stereotactic body radiotherapy (SBRT) patients and to evaluate the ...
Zhen Li MS, Shujun Zhang MS, Libo Zhang BS, Ya Li MS, Xiangpeng Zheng MD, PhD, Jie Fu MD, PhD, Jianjian Qiu PhD   +6 more
doaj   +1 more source

Rigid real-time prospective motion-corrected three-dimensional multiparametric mapping of the human brain

NeuroImage, 2022
Purpose: To develop a rigid real-time prospective motion-corrected multiparametric mapping technique and to test the performance of quantitative estimates.
Shohei Fujita, Akifumi Hagiwara, Naoyuki Takei, Issei Fukunaga, Yasuhiro Hagiwara, Takashi Ogawa, Taku Hatano, Dan Rettmann, Suchandrima Banerjee, Ken-Pin Hwang, Shiori Amemiya, Koji Kamagata, Nobutaka Hattori, Osamu Abe, Shigeki Aoki   +14 more
doaj   +1 more source

Automatic delineation and quantification of pulmonary vascular obstruction index in patients with pulmonary embolism using Perfusion SPECT-CT: a simulation study

EJNMMI Physics, 2021
Background In patients with pulmonary embolism (PE), there is a growing interest in quantifying the pulmonary vascular obtruction index (PVOI), which may be an independent risk factor for PE recurrence.
David Bourhis, Laura Wagner, Julien Rioult, Philippe Robin, Romain Le Pennec, Cécile Tromeur, Pierre Yves Salaün, Pierre Yves Le Roux   +7 more
doaj   +1 more source