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24 results on '"Pani R"'

4. Innovative LuYAP:Ce array for PET imaging

Author

Cinti, M.N., primary, Scafe, R., additional, Bennati, P., additional, Meo, S. Lo, additional, Frantellizzi, V., additional, Pellegrini, R., additional, Vincentis, G. De, additional, Sacco, D., additional, Fabbri, A., additional, and Pani, R., additional

Published
2017
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23. Position algorithm for monolithic scintillation crystals based on charge projection readout

Author

Rosanna Pellegrini, Andrea Fabbri, Enrico Preziosi, Marco Bettiol, E. Di Castro, Cristian Borrazzo, Roberto Pani, M.N. Cinti, Pani, R., Bettiol, M., Preziosi, E., Cinti, M. N., Borrazzo, C., Pellegrini, R., Di Castro, E., and Fabbri, A.

Subjects
Physics, Medicalimage reconstruction methods and algorithms, computer-aided software, 010308 nuclear & particles physics, business.industry, Detector, Linearity, Row and column spaces, 01 natural sciences, Signal, 030218 nuclear medicine & medical imaging, Reduction (complexity), 03 medical and health sciences, 0302 clinical medicine, Optics, Position (vector), 0103 physical sciences, Gamma camera, SPECT, PET PET/CT, coronary CT angiography (CTA), business, Projection (set theory), Instrumentation, Image resolution, Algorithm, Mathematical Physics
Abstract

Nuclear medicine imaging devices commonly use multi-element photo detection systems, composed of an array of N × N elements, each one providing an individual signal. Many strategies have been developed to reduce the number of readout channels, one of the main approaches is the Rows and Columns (R/C) projection logic. In this paper we proposed a modified version of Raised To the Power (RTP) algorithm adapted to R/C logic. In order to validate its efficiency a linear scanning irradiation on two 49× 49 mm2 LaBr3:Ce (0.5%) crystals with different thickness (4 mm and 10 mm) was carried out. Imaging performance analysis was made in terms of position linearity, Field-of-View (FoV) enlargement and spatial resolution. Imaging results from Anger Logic, RTP algorithm based on single element readout and RTP algorithm based on R/C readout were compared. A notable advantage of using RTP algorithms instead of Anger Logic was found: the FoV widens from about 30% to more than 70% of the detector area whereas the spatial resolution is highly improved, especially for off-center interactions, both for 4 mm-thick and 10 mm-thick crystals. Furthermore, imaging performance with the R/C readout is just slightly different from the single element one (FoV reduction less than 7% and SR worsening less than 10%). The R/C adapted RTP algorithm opens doors to high imaging performance with a substantial reduction of complexity and cost in the readout electronics.

Published
2016
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24. The use of cadmium telluride detectors for the qualitative analysis of diagnostic x-ray spectra.

Author

Di Castro E, Pani R, Pellegrini R, and Bacci C

Subjects
Cadmium, Germanium, Monte Carlo Method, Technology, Radiologic, Tellurium, Cadmium Compounds, Radiography standards, Radiometry instrumentation
Abstract

A method is introduced for the evaluation of x-ray spectra from x-ray machines operating in the range 50-100 kVp using a cadmium telluride (CdTe) detector with low detection efficiency. The pulse height distribution obtained with this kind of detector does not represent the true photon spectra owing to the presence of K-escape, Compton scattering, etc.; these effects were evaluated using a Monte Carlo method. A stripping procedure is described for implementation on a Univac 1100/82 computer. The validity of our method was finally tested by comparison with experimental results obtained with a Ge detector and with data from the literature; the results are in good agreement with published data.

Published
1984
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