Measurement accuracy
Vscan Air – User Manual 8-17
Direction GP092020-1EN Rev 18
Measurement accuracy (continued)
The ellipse circumference is calculated via the below formula
from §16 in Ramanujan, Srinivasa (1914), "Modular Equations
and Approximations to ". Quart. J. Pure App. Math. 45: 350–
372. ISBN 9780821820766.
Speed of Sound in Tissue
The average value 1540 meters / second is used for all
calculations. Depending on the tissue structures, this
generalization may give errors from 2% (typical) to 5% (much
fatty tissue layers present).
Table 8-2: Measurement accuracy - Linear array (shallow scanning) transducer
Measurement Unit Useful range Accuracy
Distance
Axial cm or mm 1mm-60mm ±0.5mm or ±3% whichever is
greater
Lateral cm or mm 2mm-40mm ±1mm or ±5% whichever is
greater
Circumference (ellipse) cm or mm 5mm-150mm ±5% or ±1mm whichever is
greater
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