9%20ECOGRAFIA%20ABDOMINAL%20COMO%20CUANDO%20DONDE

8
ABDOMINAL ULTRASOUND
to remain operational for much longer than one
capable of only poor quality, which will need
replacement much sooner. A poor-quality image is
a false economy in abdominal scanning.
Machine capabilities and functions
The availability and ease of use of various functions
differ from machine to machine. Some of the
important issues to consider when buying a
machine include:
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probe selection and switching process, simultaneous
connection of several probes
dynamic frequency capability
dynamic focusing control, number and pattern
of focal zones
functions such as beam steering, sector angle
adjustment, zoom, frame rate adjustment,
trackerball controls
time gain compensation and power output
controls
cine facility—operation and size of memory
programmable presets
tissue harmonic and/or contrast harmonic
imaging
body marker and labelling functions
measurement packages—operation and display
colour/power and spectral Doppler through all
probes
Doppler sensitivity
Doppler controls—ease of use, programmable
presets
output displays
report package option.
Ergonomics
Good ergonomics contribute considerably to the
success of the service provided. The machine must
be usable by various operators in all the required situations.
There is a significant risk of work-related
musculoskeletal disorders (WRMSD) 2 if careful
consideration is not given to the scanning environment
(see p. 12). When choosing and setting up a
scanning service, forethought should be given not
only to the design of the ultrasound machine, but
also to the seating arrangements and examination
couch. These should all be adjustable in order to
facilitate the best scanning position for the operator.
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Other considerations include:
System dimensions and steering. The
requirement for the system to be portable, for
example for ward or theatre work, or mobile
for transportation to remote clinics. Machines
used regularly for mobile work should be
robust and easy to move.
Moveable (swivel and tilt) monitor and control
panel, including height adjustment for different
operators and situations.
Keyboard design, to facilitate easy use of the
required functions, without stretching or
twisting.
Hand-held portable machines are an option
that may be considered.
Maintenance issues
It is useful to consider the reliability record of the
chosen equipment, particularly if it is to operate in
out-reach clinics, or without available backup in
the case of breakdown. Contacting other users may
prove useful.
Various maintenance contract options and costs
are available, including options on the replacement
of probes, which should be taken into account
when purchasing new equipment.
Upgradeability
A machine which is potentially upgradeable has a
longer, more cost-effective life and will be supported
by the manufacturer over a longer period of
time. Consideration should be given to future software
upgrades, possible effects and costs and other
available options for the future, such as additional
transducers or add-on Doppler facilities.
Links to image-recording devices
Most ultrasound machines are able to link up to
most types of imaging facility, whether it be a simple
black and white printer or a radiology-wide
photographic archiving and communications (PAC)
system. There may be costs involved, however, in
linking your new machine to your preferred imaging
device.