Measurements and calculations derived from ultrasound images are intended to supplement
other clinical procedures available to the attending physician. The accuracy of measurements
is not only determined by system accuracy, but also by the use of proper medical protocols by
the user.
Basically there are two measurement modes:
1.
Generic measurements (general measurements not assigned to a specific clinical
application)
2. Calculation measurements (special measurements and calculations belonging to specific
clinical measurement applications)
Measurements can be performed in all modes and image formats. During a measurement the
measurement caliper can be active (green) or fixed (yellow). A dotted line is displayed to
indicate the path of the measurement (can be deactivated in the Measurement Setup).
A measurement is identified by the number assigned to it at the end of the measurement. The
same number is used to identify the measurements in the result window (max. 8).
Dual format measurements
If the desired measurement area exceeds one image, it is possible to acquire a second image
(2D dual format) to take the measurement over both 2D images.
Note
These two images have to have the same geometrical area (zoom).
Dual format measurement is not possible in:
•
Motion Modes (M, CW, PW)
•
3D/4D
•
Quad format
•
XTD
Accuracy of Measurements
Caution
The results achieved in various application specific modes (i.e. Sono
NT
,…) always depend on
the accuracy of the procedure performed. Any clinically relevant decisions based on
ultrasound measurements need to be reconsidered and treated carefully.
The possible accuracy of geometric, flow speed or other measurements with this ultrasound
system is a result of various parameters that shall be equally considered. The used images
shall be optimized and scaled to provide the best view of the examined structures. To ensure
this, the correct choice of the ultrasound probe and imaging mode for a certain clinical
application plays an essential role.
Despite the high theoretical accuracy of the scan geometry and the measuring system of the
Voluson™ ultrasound system, it is important to be aware of increased inaccuracies caused by
the ultrasound beam traveling through the inhomogeneous human tissue. Therefore
differences between operators shall be minimized by standardization of procedures.
For more information see Advanced Acoustic Output References.
For more information see
'Bioeffects and Safety of Ultrasound Scans'
on page 2-18.
Measurements and Calculations
10-2
Voluson™ SWIFT / Voluson SWIFT+ Instructions For Use
5831612-100 R
evision 4
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