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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:21 |
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Conference: Bucharest University Faculty of Physics 2013 Meeting
Section: Nuclear and Elementary Particles Physics
Title:
Tomography and digital radiography with X-ray. Simulation and experiment (II)
Authors:
Mihai Iovea(1), Mihai Grosoşiu(1,2), Florin Necula(2), Alexandru Jipa(2), Marian Neagu(1)
Affiliation:
(1) Research & Development Company - Accent Pro 2000
(2) Faculty of Physics, University of Bucharest
E-mail
mihai.grososiu@gmail.com
neculaflorin90@gmail.com
office@accent.ro
Keywords:
tomography, radiography, back-projection, simulation, experiment
Abstract:
The X-ray Tomography and digital radiography are some of the non-destructive and non-invasive methods widely used in the field of industrial and medical applications of the Nuclear Physics. In order to understand and exemplify how could be applied the principles of tomography, three applications have been developed, first explaining the basics of radiation interaction with matter, second the principles of mathematical reconstruction and third is explaining the tomography device design requirements. The project includes an apparatus designed for applications of computer tomography and digital radiography, with the possibility of evaluating new algorithms for reconstruction, filtering and acquired data correction. Because of the need to understand and verify various algorithms for filtering and reconstruction, a simulation application was created with programmable geometry of the device and the object scanned, which could be composed from maximum three different attenuation coefficients materials. The tomographic reconstruction is accomplished through filtered back-projection algorithm, where the attenuation coefficient of a pixel is obtained by back projections of the rays that passes through the pixel point.
The control of device is made via USB port using motion and acquisition predefined commands written in C language. The applications were developed in LabVIEW© virtual instrumentation environment. Data acquisition is made from a 256 scintillation detectors in a row, covering an energy range between 20 and 140 keV. The device uses ATmega328P microprocessor, which equips Arduino development board, for recording and converting the analogue signal from the detectors block into a digital signal and for controlling two stepper motor drivers. Laboratory experiments were performed using an X-ray source and due to the good images finally obtained our development solutions regarding the control and data acquisition program and the reconstruction and data analysis algorithms has been successfully verified.
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