Table of Contents
Advertisement
Overview
The Air Heater System controls the temperature of small animals undergoing imaging
procedures. Animal temperature is measured using the rectal probe. The software
continuously processes temperature measurements and sends a control signal to the
Heater Module. The control signal depends upon the measured temperature, the user
selected set point and the control method. Mouse temperature variations of less than
±0.1 ºC can typically be obtained during MR examination.
Heater components
The SAII Air Heater System consists of a Fan Module located in the low fringe field of
the magnet and a Heater Module with "smart circuitry" located near the bore of the
magnet. The Heater Module is RF shielded and non-magnetic. It is powered from 100,
115 or 230 VAC, 50 – 60 Hz. The Heater Module should be placed as close to the
magnet bore as practical. It can be on the floor on a ladder or table or mounted in any
convenient orientation. The optimum location will allow the 2 m air tube to supply warm
air in the bore near the imaging volume. The Heater Module is controlled by the
Control/Gating Module using a fiber optic cable connected to "Heater Control". The fan
and heater are connected to each other with a 7 m air hose.
If required, the Fan Module can be located inside the magnet room. In which case, the
7 m air hose can be shortened. To shorten the air hose, unscrew the cuff from one end
and cut the hose with a knife.
Caution: The Fan Module contains small amounts of
If power is not available in the magnet room, the Heater Module can be located outside
the room with a longer air tube (up to 5 m) providing warm air to the bore. The longer
tube will, however, somewhat degrade heater performance
It is important not to restrict the air flow coming from the Heater Module. Restricting the
air flow by for example adapting smaller tubing can degrade system performance.
Caution: Do not restrict air flow from the Heater Module.
A Higher Output Fan Module is available as an option to increase the delivery of energy
in cases where the setup necessarily restricts air flow. In that case contact SAII's
Customer Service.
ferromagnetic components. It should be fix
mounted if used in the RF shielded room or if
it could inadvertently be moved into a region
of large fringe magnetic field.
Restricting air flow can reduce the amount of
energy delivered into the bore and degrades
performance.
Revision C, August 2013
Chapter 6
Air Heater System
6-1
Advertisement
Table of Contents
