EPIQ 5 & 7 Training Manual
© 2016 Conquest Imaging
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Electromagnetic Interference
Electromagnetic Interference (EMI) between wireless electronic
transmitting devices and medical equipment can cause degradation
of the ultrasound image. The system is in compliance with existing
EMI/EMC requirements. However, the use of this system in proximity
of an electromagnetic field can cause degradation of the ultrasound
image at times. Review the environment in which the system is being
used, to identify possible sources of radiated emissions. Sources of
these emissions can be from electrical devices used in the same or
adjacent room. Communication devices that transmit or receive RF
signals; cellular phones, pagers, radio, TV, or microwave transmission
equipment located nearby can cause these emissions. If EMI from an
outside source is causing disturbances, you may need to relocate your
system. Electrosurgical units (ESUs), MRI’s and many other medical
devices introduce radio frequency (RF) electromagnetic fields to the
environment. Because ultrasound imaging frequencies are in the RF
range, ultrasound transducer circuits are also susceptible to RF
interference. For example, the noise generated by an ESU in use can
easily impair or eliminate the ultrasound’s ability to capture an image.
Some measures to reduce the chance of EMI interference include:
Three-meter rule – no powered on cell phones, or pagers within
three meters of the system while in operation.
Locate the system away from other imaging equipment such as
MRI’s that produce strong electromagnetic fields.
Electrostatic Discharge ESD Precautions
Electrostatic discharge (ESD), commonly referred to as a static shock,
is a naturally occurring phenomenon. Electrical charges naturally
build up on individuals and can create static shocks. The human body
can build up a charge as high as 25,000 volts, therefore a discharge
from a system user or patient to the ultrasound system can cause
damage to the system or transducers. Digital ICs are particularly
vulnerable. Low humidity is a condition that favors the build-up of
electrostatic charge.
The following are the most common causes of ESD:
Moving equipment
Moving people
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