Wyniki wyszukiwania - BazTech

1

Integration of EEG and SPECT data acquired from simultaneous examinations

Kowalczyk M., Bajera A., Goszczynska H., Zalewska E., Krolicki L.

Biocybernetics and Biomedical Engineering

|

2013

|

Vol. 33, no. 4

196--203

EN

The aim of this study was to develop a convenient method for superimposing SPECT images and EEG maps. This work was performed as part of research concerning feasibility of improving the localization of epileptic foci comparing to the standard SPECT examination by applying the technique of EEG mapping. The described method relies on making five EEG electrodes visible in SPECT images, calculating the coordinates of these electrodes in SPECT image space, approximating the coordinates of the remaining electrodes used in EEG recording and then computing a sequence of 3D EEG maps spanning on all the electrodes. An example of visualization of EEG and SPECT data integration was presented. The maximum error of the five base electrodes location was assessed below 10 mm. Assuming the exact placement of the base electrodes the accuracy of the proposed method was estimated below 5.5 mm.

2

Obrazowanie struktury i czynności narządów wewnętrznych metodą PET : podstawy fizyczne

Królicki L., Bajera A., Kunikowska J.

Inżynier i Fizyk Medyczny

|

2012

|

Vol. 1, nr 2

39--43

PL

Technika PET jest obecnie podstawową metodą obrazowania molekularnego. Jest stosowana w diagnostyce, określeniu stopnia zaawansowania choroby oraz w monitorowaniu leczenia. Do podstawowych rozwiązań, które jednoznacznie przyczyniły się do rozwoju techniki PET należą wprowadzenie iteracyjnych metod rekonstrukcji obrazów, zastosowanie nowych typów kryształów scyntylacyjnych, wprowadzenie metody PET-CT, opracowanie metody time of flight, a obecnie zastosowanie metody PET-MRI. Zrozumienie zasad techniki PET, jej zalet, a przede wszystkim ograniczeń, jest niezbędne nie tylko dla właściwej interpretacji ostatecznego wyniku przez lekarza, ale również dla optymalizacji parametrów skanowania i oceny źródeł artefaktów przez fizyka/ inżyniera medycznego.

EN

At present, PET is a basic method of molecular imaging. It is applied in diagnostics, for determining the degree of the progress of illness and in monitoring the treatment. To basic answers which explicitly contributed to the development of PET belong introduction of iterative methods for reconstruction of images, applying new types of scintillators, implementing the hybrid PET-CT scanners, developing the method time of flight, and at present, application of PETMRI. Understanding principles of the technique, its limitations and advantages, is essential not only for appropriate interpretation of the final result by the doctor, but especially for the optimization parameters of scanning and the evaluation of sources of artifacts by the medical physics/engineer.

3

Comparison of different SPECT images analysis methods for inter-hemispheric asymmetry detection in patients with epileptic symptoms

Olejarczyk E., Przytulska M., Bajera A., Królicki L.

Biocybernetics and Biomedical Engineering

|

2008

|

Vol. 28, no. 4

33-41

EN

The aim of this work was examination of asymmetries in activity of the left and right cerebral hemispheres as well as localization and contouring of the regions of reduced or increased activity on the basis of single photon emission computed tomography (SPECT) images. The mean and standard deviation of normalized intensities inside the contoured areas of images, entropy based on intensity histograms and Chen's fractal dimension were calculated.