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Electro-magnetic Interference
The detector has been designed and tested to meet all IEC regulations in regard to electro-magnetic (EM)
susceptibility (and EMC).
However, there are no regulations for low frequency EM fields. All flat panel detectors have some
susceptibility to these EM fields.
This detector is robust to EM fields up to 0.1mG over a broad low frequency range (DC - 250kHz).
It has been found that some common equipment in clinical environments can generate EM fields well
over 0.1mG. Some measurements have shown 4mG field strengths which can cause artifacts on x-ray
images.
EM fields are reduced by the square of the distance between the EM source and the detector. Thus,
moving the EM source twice as far away will reduce the field strength by 4 times.
General suggestions:
•
Keep IV pumps, patient monitoring, feeding pumps 1 meter or more away from any detector surface.
•
Consider turning off equipment that cannot be moved.
•
Change the patient or detector orientation /position to maximize distance from any equipment.
Possible sources of EM fields:
•
IV pumps
•
Monitors
•
Feeding pumps
•
Patient monitors
•
ECG equipment
•
EMG equipment
•
Infusion pumps
•
RF ablators
•
Powered surgical equipment
•
Heaters
•
Air conditioners
•
Refrigerators
Definium AMX 700 X-Ray System
Operator Manual
5161515-1EN
Rev. 6 (10 February 2008)
© 2008 General Electric Company. All rights reserved.
Chapter A1: Detector Overview
A1-6
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