Philips CARDIOMD, Service Manual

Page: 70 / 466

Detector Calibration
4-14
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CardioMD Service Manual
1MAN0158-H11 04-2005 CSIP Level 1
4.2.4 Energy Calibration (ECal)
4.2.4.1 Description
Energy Calibration ensures that the digital representation of the energy spectrum matches window
selections and the spectrum display. The calibration is based upon two or three known isotope
peaks exposing the detector. Two isotope peaks are used though the calibration procedure sup-
ports up to three peaks.
Note . ECal must be preceded by HV and PMT calibration.
Note . If the CardioMD system is equipped with the AC Option, the transmission scanners must be
removed before Energy calibration can be performed. See Chapter 12 CardioMD AC Option for
instructions.
4.2.4.2 Energy Calibration Procedure
To be performed: When the EDC board, X-E board or crystal is replaced.
Detector: One detector at a time, without collimator.
Source: High Energy: Tc-99m ~ 40 MBq or 1 mCi
Low Energy: Low peak of Tl-201, Ga-67, Ba-133 or Am-
241 ~ 40 MBq or 1 mCi.
Total calibration time: Approximately 5 minutes per detector.
Calibration file created:
C:/Cardiocam/calibrations/ecal.det1
and
det2
respectively.
Procedure Details
1. Remove the collimator from the detector
to be calibrated. See the Operator’s Man-
ual for instructions.
2. Ensure that the CardioMD system is in the
patient load position.
3. On the Persistence page, click the Tools
button.
4. When the Calibration & Configuration
menu appears, click Service.
5. If prompted, enter the service password
(see page 4-9 for instructions).
6. In the Service Calibrations menu, click
ECal.