B-K Medical Pro Focus 2202, User Manual

Page: 23 / 356

General and Safety Information 23
Interference
Electrical
noise
Electrical Noise
Electromagnetic Interference
Medical electrical equipment requires special precautions regarding EMC
(electromagnetic compatibility). You must follow the instructions in this chapter
when you install the scanner and put it into service.
If the image is distorted, it may be necessary to position the scanner further from
sources of electromagnetic interference or to install magnetic shielding.
Other
equipment
nearby
EMC noise can reduce the usable image depth. Therefore, in order to avoid having
to repeat an ultrasound examination, you must make sure beforehand that the
ultrasound system can be used for the examination. Repeating an examination can be
regarded as a potential risk that should be avoided, especially if the examination
involves transducers used intracorporeally or transducers used for puncture.
RF (Radio Frequency) Interference
Portable and mobile RF (radio frequency) communication equipment can affect the
scanner, but the scanner will remain safe and meet essential performance
requirements.
An ultrasound scanner intentionally receives RF electromagnetic energy for the
purpose of its operation. The transducers are very sensitive to frequencies within
their signal frequency range (0.5MHz to 35MHz). Therefore RF equipment
operating in this frequency range can affect the ultrasound image. However, if
disturbances occur, they will appear as white lines in the ultrasound picture and
cannot be confused with physiological signals.
WARNING Electrical noise from nearby devices such as electrosurgical devices – or
from devices that can transmit electrical noise to the AC line – may cause disturbances
in ultrasound images. This could increase the risk during diagnostic or interventional
procedures.
WARNING Do not use this equipment adjacent to other equipment. If you must place
it next to or stacked with other equipment, verify that it operates normally there and
neither causes nor is affected by electromagnetic interference.
WARNING Other equipment may interfere with the scanner, even if that other
equipment complies with CISPR (International Special Committee on Radio
Interference) emission requirements.
WARNING If you use accessories, transducers or cables with the scanner, other than
those specified, increased emission or decreased immunity of the system may result.