Összesen 4 találat.


001-es BibID:BIBFORM061303
Első szerző:Krizsán Áron Krisztián (fizikus)
Cím:A Promising Future : comparable Imaging Capability of MRI-Compatible Silicon Photomultiplier and Conventional Photosensor Preclinical PET Systems / Aron K. Krizsan, Imre Lajtos, Magnus Dahlbom, Freddie Daver, Miklos Emri, Sandor A. Kis, Gabor Opposits, Laszlo Pohubi, Norbert Potari, Gyula Hegyesi, Gabor Kalinka, Janos Gal, Jozsef Imrek, Ferenc Nagy, Ivan Valastyan, Beata Kiraly, Jozsef Molnar, Delfo Sanfilippo, Laszlo Balkay
Megjegyzések:We recently completed construction of a small-animal PET system- the MiniPET-3-that uses state-of-the-art silicon photomultiplier (SiPM) photosensors, making possible dual-modality imaging with MRI. In this article, we compare the MiniPET-3 with the MiniPET-2, a system with the same crystal geometry but conventional photomultiplier tubes (PMTs). Methods: The standard measurements proposed by the National Electrical Manufacturers Association NU 4 protocols were performed on both systems. These measurements included spatial resolution, system sensitivity, energy resolution, counting rate performance, scatter fraction, spillover ratio for air and water, recovery coefficient, and image uniformity. The energy windows were set to 350-650 keV on the MiniPET-2 and 360-662 keV on the MiniPET-3. Results: Spatial resolution was approximately 17% better on average for the MiniPET-3 than the MiniPET-2. The systems performed similarly in terms of peak absolute sensitivity (~1.37%), spillover ratio for air (~0.15), spillover ratio for water (~0.25), and recovery coefficient (~0.33, 0.59, 0.81, 0.89, and 0.94). Uniformity was 5.59% for the MiniPET-2 and 6.49% for the MiniPET-3. Minor differences were found in scatter fraction. With the ratlike phantom, the peak noise-equivalent counting rate was 14 kcps on the MiniPET-2 but 24 kcps on the MiniPET-3. However, with the mouselike phantom, these values were 55 and 91 kcps, respectively. The optimal coincidence time window was 6 ns for the MiniPET-2 and 8 ns for the MiniPET-3. Conclusion: Images obtained with the SiPM-based MiniPET-3 small-animal PET system are similar in quality to those obtained with the conventional PMT-based MiniPET-2.
Tárgyszavak:Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
small-animal PET scanner
performance evaluation
molecular imaging
Megjelenés:Journal Of Nuclear Medicine 56 : 12 (2015), p. 1948-1953. -
További szerzők:Lajtos Imre (1986-) (fizikus) Dahlbom, Magnus Daver, Freddie Emri Miklós (1962-) (fizikus) Kis Sándor Attila (1973-) (fizikus) Opposits Gábor (1974-) (fizikus, szoftver fejlesztő) Pohubi László (1959-) (fizikus) Pótári Norbert (1980-) (vegyész) Hegyesi Gyula (1963-) (villamosmérnök) Kalinka Gábor Gál János Imrek József (1980-) Nagy Ferenc (1984-) (fizikus) Valastyán Iván (1979-) (fizikus, informatikus) Király Beáta (fizikus) Molnár József Sanfilippo, Delfo Balkay László (1963-) (biofizikus)
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001-es BibID:BIBFORM024809
Első szerző:Opposits Gábor (fizikus, szoftver fejlesztő)
Cím:Automated region analysis of brain PET examinations / G. Opposits, T. Spisak, I. Lajtos, L. Pohubi, L. Galuska, A. Jakab, E. Berenyi, M. Emri
Tárgyszavak:Orvostudományok Klinikai orvostudományok idézhető absztrakt
Megjelenés:European Journal of Nuclear Medicine And Molecular Imaging 38 : Suppl. 2 (2011), S333. p. -
További szerzők:Spisák Tamás (1986-) (programtervező matematikus, informatikus) Lajtos Imre (1986-) (fizikus) Pohubi László (1959-) (fizikus) Galuska László (1946-) (belgyógyász, izotópdiagnoszta) Jakab András (1985-) Berényi Ervin (1964-) (radiológus) Emri Miklós (1962-) (fizikus)
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001-es BibID:BIBFORM052812
Első szerző:Spisák Tamás (programtervező matematikus, informatikus)
Cím:Surfaces, atlases, and other advanced imaging techniques in the ervice of nuclear medicine / T. Spisák, S. A. Kis, G. Opposits, I. Lajtos, L. Pohubi, L. Balkay, M. Emri
ISSN:1506-9680 1644-4345
Tárgyszavak:Orvostudományok Klinikai orvostudományok idézhető absztrakt
Megjelenés:Nuclear Medicine Review. Central and Eastern Europe. - 16 : Suppl. A (2013), p. A16-A16. -
További szerzők:Kis Sándor Attila (1973-) (fizikus) Opposits Gábor (1974-) (fizikus, szoftver fejlesztő) Lajtos Imre (1986-) (fizikus) Pohubi László (1959-) (fizikus) Balkay László (1963-) (biofizikus) Emri Miklós (1962-) (fizikus)
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001-es BibID:BIBFORM046010
Első szerző:Spisák Tamás (programtervező matematikus, informatikus)
Cím:BrainMOD : 4-dimensional multimodal medical image analysis software / Spisák Tamás, Opposits Gábor, Kis Sándor Attila, Lajtos Imre, Krizsán Áron, Pohubi László, Balkay László, Emri Miklós
Megjegyzések:PurposeWithin the Central Nervous System Imaging project ( of the ENIAC consortium, the need has emerged for a general multimodal visualization platform which facilitates the evaluation of data produced by new enhanced devices developed in the project. Taking advantage of multi-source post-processed data, this software aims to help interpreting complex intramodal relationships. The modalities involved are PET, MRI, EEG, EIT.According to the project proposal, our purpose was to develop a software for interactive user-friendly 2D and 3D visualization of post-processed multimodal medical imaging data. Important requirements were to manage dynamic image data and explicitly support the use of various enhanced brain imaging techniques.MethodsThe input of the software are MR structural data, fMRI and PET dynamic data and activation maps (GLM, ICA), EEG/EIT based static functional maps and dynamic data, other EEG and fMRI related time series (eg. hemodynamic response functions, independent component analysis time courses), volumes-of-interests of segmentation data and EEG/EIT marker positions. Besides conventional 2D image fusion features, the software provides numerous ways to reveal intramodal dynamic relationships. Volumes-of-interests can be delineated manually or automatically aided by various segmentation algorithms or brain atlases [1]. Time series curves can be generated from the image data and on these various operations can be performed (eg. resampling, filters, correlation, convolution, wavelet, multiresolution analysis). Three dimensional surfaces can be reconstructed, visualized and colored by multiple parameters (eg. dynamic functional information).The software system was implemented in C++.Results and conclusionThe program is built upon the MultiModal Medical Imaging software library system ( and runs on Windows 7 and Windows Xp operation systems and various Linux distributions. The hardware requirements of the application match the current average PC configurations. Due to the advanced VOI and time-series analysis features, the comprehensive file IO component and the compatibility with third party software tools, BrainMOD provides a useful user friendly alternative among software tools in medical image processing.
Tárgyszavak:Orvostudományok Klinikai orvostudományok előadáskivonat
medical imaging
Megjelenés:Electronic presentation online system : ECR Congress 2013 / [ed. ESR]. - p. C-2586.
További szerzők:Opposits Gábor (1974-) (fizikus, szoftver fejlesztő) Kis Sándor Attila (1973-) (fizikus) Lajtos Imre (1986-) (fizikus) Krizsán Áron Krisztián (1986-) (fizikus) Pohubi László (1959-) (fizikus) Balkay László (1963-) (biofizikus) Emri Miklós (1962-) (fizikus)
Pályázati támogatás:TÁMOP-4.2.2.C-11/1/KONV-2012-0001
ENIAC CSI (No.120209)
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