Speaker
Dr
David Guez
(IPHC)
Description
A new Multi Modality Imaging System for Small Animal (AMISSA) is under development,
at the Hubert-Curien Multidisciplinary Institute (IPHC, France). Within this
framework, a new PET design is under study[1].
This system is aimed to achieve a spatial resolution of 1 µl in the entire field of
view (FOV), along with a high detection efficiency, close to the geometrical
efficiency in the center of the FOV.
To fulfill this requirement, the scanner is designed to give access to the "depth of
interaction" information. It is organized into several modules of LYSO crystals. Each
module is oriented along the scanner axis, and it is read, at both ends, by a
multianode PMT. This layout gives a direct access to the depth of interaction from
the crystal address, while the axial position is measured from the light sharing
between both crystal ends. The modules are layered into several concentric rings to
reach the required detection efficiency.
Results of the Monte-Carlo simulations used to define the design of the detector are
presented in this paper. Investigations are made on the geometrical layout and on the
acquisition system. The expected spatial resolution and counting rate are evaluated
and used as criteria for this design process.
One major interest of measuring the depth of interaction is to avoid the degradation
of the spatial resolution for the points source located at the edge of the field of
view. The evolution of the spatial resolution according to the position of the source
will then be evaluated with an usual reconstruction algorithm.
On the other hand, the impact of the high counting rate, expected from the high
detection efficiency will be explored. In particular, the consequences on the timing
performances required for the crystal response, the electronic readout and the
acquisition elements will be evaluated. The amount of disk space and the minimal data
transfer bandwidth necessary to record all the single events will be evaluated.
Author
Dr
David Guez
(IPHC)
Co-authors
Dr
David Brasse
(IPHC)
Denis Staub
(IPHC)
Jean-Louis Guyonnet
(IPHC)
