Search results for "medical physics"
showing 10 items of 579 documents
Integration of multifunctions with closed convex values in arbitrary Banach spaces
2018
Integral properties of multifunctions with closed convex values are studied. In this more general framework not all the tools and the technique used for weakly compact convex valued multifunctions work. We pay particular attention to the "positive multifunctions". Among them an investigation of multifunctions determined by vector-valued functions is presented. Finally, decomposition results are obtained for scalarly and gauge-defined integrals of multifunctions and a full description of McShane integrability in terms of Henstock and Pettis integrability is given.
Evaluation und interne Qualitätssicherung in der Allgemein- und Abdominalchirurgie
1997
The measuring of perioperative risk, the finding of intraoperative influences and the objective rating of quality of treatment were achieved by our program of quality assurance. With our system it is possible to measure differences between several surgeons and also differences in comparison to national and international results. Through optimised therapy the program can lead to an improvement of quality.
Data for: External photon radiation treatment for prostate cancer: uncomplicated and cancer-free control probability assessment of 36 plans
2019
Tables list neutron and photon dose to peripheral organs in a prostate cancer treatment as well as second primary cancer risk (per 100 patients for age at exposure of 60 y) at each organ for all studied plans. The code is a matlab routine to compute photon peripheral doses.
Experimental study of vergence response and fixation disparity
2013
Anotācija. Darba mērķis ir izpētīt verģences atbildes dinamiskās īpašības un pārbaudīt, cik lielā mērā šīs īpašības kopā ar citiem fizioloģiskiem mehānismiem ir saistītas ar fiksācijas disparitātes izveidošanos. Mērījumi veikti subjektīvi, izmantojot nonius metodi, un objektīvi, izmantojot videookulogrāfu EyeLink II. Verģences atbildes asimetrijas individuālās atšķirības spēj izskaidrot ne vairāk kā 50 % no fiksācijas disparitātēm. Fiksācijas disparitātes izveides process ir saistīts arī ar tumsas verģenci un metodes kļūdu, kā arī ar akomodācijas darbību. Līdz ar to var secināt, ka klīniski nozīmīga fiksācijas disparitāte, kas noteikta, izmantojot subjektīvas metodes, parādās atšķirīgu fizi…
IN VIVO ādas autofluoriscences kinētika nepārtrauktās un impulsveida lāzeru ierosmē
2017
Darbā izstrādātas un eksperimentāli/klīniski aprobētas divas mērījumu iekārtas pigmentētu ādas jaunveidojumu fluorescentai diagnostikai un četras iekārtas autofluorescences (AF) fotoizbalēšanas ietekmes pētīšanai uz cilvēka ādas spektrālajiem parametriem. Mērījumu iekārtas ar nepārtrauktu 532 nm ierosmi ādas pigmentēto jaunveidojumu punktveida mērījumiem un ar 405 nm ierosmi attēlošanas mērījumiem. Piedāvāts jauns diagnostiskais kritērijs, kas ļauj atšķirt bazālo šūnu karcinomas no citām ādas patoloģijām. Ādas AF mērījumi 405 nm un 470 nm lāzeru pikosekunžu impulsu ierosmē veikti ar ~10−10s laika izšķirtspēju. Atrasta korelācija starp ādas un intradermāla nēvusa AF fotoizbalēšanas ātrumu un…
Anomalous water dynamics in brain: a combined diffusion magnetic resonance imaging and neutron scattering investigation
2019
International audience; Water diffusion is an optimal tool for investigating the architecture of brain tissue on which modern medical diagnostic imaging techniques rely. However, intrinsic tissue heterogeneity causes systematic deviations from pure free-water diffusion behaviour. To date, numerous theoretical and empirical approaches have been proposed to explain the non-Gaussian profile of this process. The aim of this work is to shed light on the physics piloting water diffusion in brain tissue at the micrometre-to-atomic scale. Combined diffusion magnetic resonance imaging and first pioneering neutron scattering experiments on bovine brain tissue have been performed in order to probe dif…
Interpretation of Diagnostic Imaging for Medicolegal Issues
2019
Forensic radiology is a relative recently emergent part of forensic medicine characterized by the application of radiological methods in criminal investigations, such as the forensic M.E’s radiological reports in civil or penal matters for judicial technical advice. The various imaging modalities like X-rays, Computed Tomography (CT), Magnetic Resonance Imaging (MRI), and ultrasonography can be used depending on various forms of cases and their requirements in routine investigations.
Hyperpolarized 1H long lived states originating from parahydrogen accessed by rf irradiation
2013
Hyperpolarization has found many applications in Nuclear Magnetic Resonance (NMR) and Magnetic Resonance Imaging (MRI). However, its usage is still limited to the observation of relatively fast processes because of its short lifetimes. This issue can be circumvented by storing the hyperpolarization in a slowly relaxing singlet state. Symmetrical molecules hyperpolarized by Parahydrogen Induced Hyperpolarization (PHIP) provide a straightforward access to hyperpolarized singlet states because the initial parahydrogen singlet state is preserved at almost any magnetic field strength. In these systems, which show a remarkably long 1H singlet state lifetime of several minutes, the conversion of t…
Evidence for Water-Tuned Structural Differences in Proteins: An Approach Emphasizing Variations in Local Hydrophilicity
2012
We present experimental evidence for the significant effect that water can have on the functional structure of proteins in solution. Human (HSA) and Bovine Serum Albumin (BSA) have an amino acid sequence identity of 75.52% and are chosen as model proteins. We employ EPR-based nanoscale distance measurements using double electron-electron resonance (DEER) spectroscopy and both albumins loaded with long chain fatty acids (FAs) in solution to globally (yet indirectly) characterize the tertiary protein structures from the bound ligands' points of view. The complete primary structures and crystal structures of HSA and as of recently also BSA are available. We complement the picture as we have re…
Trends in Patient Generated Data – An Initial Review
2019
In recent years, patient-centered care has gained significant momentum in healthcare and the patient is more involved as an active participant in data generation. In this state of the art review we ...