Riccardo Guzzardi

Learn More
Magnetic resonance imaging (MRI), single photon emission tomography (SPET), and positron emission tomography (PET) using [18F]fluorodeoxyglucose were used in combination with scalp and scalp-video EEGs in a group of 30 pediatric patients with drug resistant epilepsy (DRE) in order to identify patients who could benefit from neurosurgical approach. Seizures(More)
To evaluate scatter fraction and scatter pair spatial distribution, experimental methods are generally used. These methods make use of a line source, placed along the FOV axis, inserted in a cylindrical phantom filled with air or water. The accuracy of these experimental methodologies can be tested by the use of a Monte Carlo method. In fact, the simulation(More)
A scatter correction algorithm, based on the integral transformation of the projections, has been implemented when using the C.N.R. positron tomograph in Pisa. The performance of the method has been evaluated by measurements on ad hoc phantoms. The technique allows a significant average reduction of the reconstructed scatter fraction. The limitations of(More)
A major obstacle to the three dimensional approach in Positron Emission Tomography is the time required to compute the reconstruction. The bulk of computations for no matter which algorithm is chosen is backprojection. This paper describes a possible architecture capable of supporting the scanner data rate while performing backprojection on an event by(More)
This paper describes a procedure proposed for the quantitative evaluation of the influence of the scattering noise on the reconstructed PET images. Applying the same experimental procedure used to evaluate the Scatter Fraction (SF) on the sinograms obtained measuring line sources within a uniform scattering medium, the method here proposed permits the(More)
  • 1