Introduction; Detector Calibration; Detector Calibrations Overview - Philips CARDIOMD Service Manual

4.1 Introduction

This section describes all calibrations necessary to the CardioMD system.

4.2 Detector Calibration

4.2.1

Detector Calibrations Overview

All detector calibrations are performed electronically and activated by menu selections on the
acquisition PC.
Before starting calibration, make sure that high voltage has been applied for a period of time. If
power has been removed for more than a 15 minute period, the high voltage must be applied for
an equal period before calibration can be started. The maximum warm-up period required is 5
hours. The detector electronics must also have at least 15 minutes with the cover installed, to
reach operating temperature. Fluctuations in temperature (increase or decrease) can cause calibra-
tions to drift as the detectors reach operating temperature.
A complete calibration may be necessary after replacement of following detector parts:
•
EDC board
•
PMT
•
X-E board
•
Y board
•
Crystal.
A complete calibration of a CardioMD detector involves the steps listed in Table 4.1.
Note. The shaded rows indicate the calibrations required at time of installation.
# *)
Calibration
1 HVCal (high voltage calibra-
tion)
2 PMTCal (PMT basic calibra-
tion)
3 Ecal (energy calibration)
4 GeoCal (geometry calibration)
5 PMTCal update
6 ECor (energy correction map
calibration)
7 LinCor (spatial linearity map
calibration)
1MAN0158-H11 04-2005 CSIP Level 1
Equipment Isotopes
(point sources)
N/A N/A
Point source holder Tc-99m or Co-57
~ 40 MBq or 1 mCi
Point source holder Tl-201, Ga-67 or Ba-
133 and Tc-99m
~ 40 MBq or 1 mCi
MWSR mask, 4 sources, Tl-201,
4 collimated source Ga-67 or Ba-133
holders ~ 4 – 12 MBq or
0.1 – 0.3 mCi each
Point source holder Tc-99m or Co-57
~ 40 MBq or 1 mCi
Point source holder Tc-99m or Co-57
~ 40 MBq or 1 mCi
Linearity phantoms Tc-99m or Co-57
Point source holder ~ 120 – 200 MBq or
3 – 5 mCi
Calibration
Approx.
duration per
detector
3 min.
10 min.
5 min.
5 min.
5 min.
30 min.
60 min.
CardioMD Service Manual 4-3