RaySafe Xi - Manual (Page 20)

Ct MeasureMent
the raysafe Xi Ct detector is an ion chamber with a 10 cm active length and a built-in bias voltage. the center
and the edges (+ 5 cm and - 5 cm) of the active volume are marked on the phantom adapter.
an automatic correction of temperature and pressure will be applied for all dose measurements. the
temperature sensor is positioned inside the active ionization chamber and the measurement is corrected for
the true temperature inside the phantom. the pressure sensor is placed inside the raysafe Xi Ct detector
housing and is calibrated to show the actual pressure at the measurement facility’s altitude. readings of
pressure can therefore vary from announcements in newspapers or web sites, which normally refer to the
pressure at sea level. the measured temperature and pressure for each exposure can be displayed when using
the raysafe Xi view.
how to Measure Ct dose
position the raysafe Xi Ct detector in the phantom adapter and then into the phantom position. turn on the
meter and select Ct dose.
20
raysafe Xi user Manual – Ct Measurement