Speaker
Vito Gagliardi
(IRCCS Stella Maris)
Description
Power supply of PET detectors is a serious issue for
integrated PET/MRI systems, due to mutual interaction between
power supply electronics and MRI magnetic fields. In this work,
we developed a prototype of a magnetic compatible power supply,
that can be safely placed and used in a MRI magnetic field. The
power supply is a highly compact (5.2x5.2 cm) switching DC-DC
converter iron-core free. The power supply works in the Very
High Frequency (VHF) range, between 24.5 and 26.5 MHz, so
as to avoid RF coupling between power supply signal harmonics
and RF magnetic field of a 1.5 T MRI scanner, that works at 64
MHz. Power supply output parameters (power and voltage) have
been chosen to match those of the PET boards of the PET/MRI
TRIMAGE scanner, in which the power supply could be placed.
In particular, the main goal was to convert 12 V DC input to
3.3 V DC output with 10 W output power. At present, the power
supply is able to convert 12 V input to 5 V and 10 W output
with a measured efficiency of 70.5% without need of a dedicated
cooling system. Magnetic compatibility has been verified in a 1.5
T and 7 T MRI scanners, where no artifacts induced by the
circuit were observed in MRI images and MRI scanners performances
were similar in presence and absence of power supply.
Primary author
Vito Gagliardi
(IRCCS Stella Maris)
Co-authors
Mr
Andrea Puccini
(AGE Sceintific)
Francesco Fidecaro
(PI)
Giancarlo Sportelli
(PI)
Mr
Giovanni Franchi
(AGE scientific)
Maria Evelina Fantacci
(PI)
Maria Giuseppina Bisogni
(PI)
Mr
Niccolo' Camarlinghi
(Universita' di Pisa)
Nicola Belcari
(University of Pisa)
