• For the assessment of knowledge, meetings will be organized between the teacher and the group of students who perform the laboratory experiences and draw up the reports of the experimental activities
• The knowledge assessment will be based on the evaluation of the reports
fondamenti di interazione radiazione-materia
fundamentals of radiation-matter interaction
Programma:
Sorgenti e rivelatori di radiazione ionizzante
Principi e Tecniche di Imaging
Program:
Lab I: Ionizing radiation sources and detectors
1.Gamma spectroscopy with NaI (Tl) detectors
Acquisition and analysis of spectra of radioactive sources with NaI (Tl) detector
Measurement of the geometric acceptance of the detector
Measurement of the attenuation coefficients of copper and aluminum at various gamma radiation energies
Estimate of the activity of radioactive sources and efficiency of the detector
2.General properties of Si detectors for the detection of ionizing radiation and characteristics of the electronics associated with them
Measurement of the noise of an electronic chain
Measurement of efficiency of a detector
Acquisition and analysis of source spectra with Si detectors
3.Determination of the quality of X-ray beams produced by x-ray machines for medical use
Reproducibility of the output of an X-ray tube
Measurement of the dose measured by an ionization chamber as a function of anodic current, exposure time and kVp
Measurement of geometric acceptance
Measurement of HVL at different kVp values
Observation and quantification of the "heel" effect
4.Silicon photomultipliers (SiPM)
Current-voltage characteristic curve
Gain measurement
Dark count rate measurement
Cross talk measurement
Charging and discharging time
Spectra with scintillators and radioactive sources
lab II: Imaging principles and techniques
1.Characterization of x-ray imaging systems
Image formation, contrast and signal / noise ratio
Transfer functions
Detector features
Equalization of images
Spatial resolution of the detector: measurement of PSF and MTF
Detector noise characterization
Measurement of the efficiency and measurement of the detective quantum efficiency of a detector
Characterization of the X-ray source: measurement of the spot size
2.Characterization of a PET system based on pixelated LYSO crystals read by position-sensitive phototubes and FPGA-based data acquisition electronics
Image formation, electronic collimation and noise
Acquisition systems, architectures and hybrid systems
Tomographic reconstruction methods
PET detectors
Temporal resolution
Count rate and types of downtime
3.Characterization of an optical imaging system based on a CCD detector
CCD noise measurement
Measurement of the spatial resolution of the imaging system
Measurement of the amount of light collected as a function of the lens f / number
Examples of photoluminescence of common materials
Cerenkov Luminescence Imaging Image Analysis (CLI)
G.F. Knoll, Radiation detection and measurement, J.Wiley & Sons, New York; H. E. Jhons, J.R. Cunningham, The Physics of radiology, C.C. Thomas, Springfield; S. Webb, The Physics of Medical Imaging, Institute of Physics Publishing, Bristol and Philadelphia; J. Beutel, H.L. Kundel, R.L. Van Metter, Handbook of Medical Imaging, SPIE Press, Bellingham, Whashington, USA; Materiale didattico fornito dai docenti.
G.F. Knoll, Radiation detection and measurement, J.Wiley & Sons, New York; H. E. Jhons, J.R. Cunningham, The Physics of radiology, C.C. Thomas, Springfield; S. Webb, The Physics of Medical Imaging, Institute of Physics Publishing, Bristol and Philadelphia; J. Beutel, H.L. Kundel, R.L. Van Metter, Handbook of Medical Imaging, SPIE Press, Bellingham, Whashington, USA; Tutorials and support material provided by the teacher.
E' fortemente consigliata la frequenza
attendance is strongly suggested