User's Manual

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Vscan Extend – User Manual 5-23
5721203-100 Rev. 13
Auto freeze
If Vscan Extend is idle for a period of time, the device enters
freeze mode to minimize risk of overheating and battery
drainage. Press the display to unfreeze the image and continue
scanning. See ‘Scan Settings’ on page 4-2 for more information.
AutoCycle
Vscan Extend does not include an ECG interface as often found
on larger ultrasound systems intended for cardiovascular
applications. The AutoCycle feature detects a complete cardiac
cycle by analyzing the cyclicity of the ultrasound intensity data.
The resulting time-stamps are used for storing and playing
cineloops smoothly. The AutoCycle feature should typically
detect heart rates in the range 46–100 beats per minute. If the
detected heart cycle is outside this range, or if the cyclicity
quality is too poor, a default loop will be saved based on image
data and configuration. The detected start and stop times for the
AutoCycle are not necessarily in phase with the QRS complex.
Since adequate cyclicity can only be expected in cardiac
applications, all other applications will use the default config
settings.
Use of sterile sheath
It is recommended to use a sterile sheath around the probe and
main unit if Vscan Extend is used as an aid to needle guidance
or in any clinical situation where contamination could be a
concern.