ACUSON Cypress™ Operator’s Manual
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Measurement Accuracies
Measurement Accuracies
The Cypress system may be used to provide measurements and calculations
derived from ultrasound images. The quantified image data may be used along
with other clinical information to assist a physician in making a patient diagno-
sis.
The sole reliance on diagnostic ultrasound data to make a clinical diagnosis is
not recommended. Numerous factors related to the accuracy of ultrasound
image data must be taken into account. This section describes some of these
factors. Measurement accuracies are also influenced by operator experience,
scanning technique, interpreting physician experience, and the technical diffi-
culty of the patient. Many of these variables are not associated with the Cypress
system. This limits the ability to fully specify the clinical accuracy of the mea-
surements and calculations provided by the Cypress system.
Accuracy by Transducer Type
All transducers types have been verified for measurement accuracy in the
modes appropriate to each measurement type.
Because of the moderate transducer frequency range of the system, measure-
ment accuracies for the system are not expected to vary significantly based
upon the transducer being used. Transducers range in scanning depth from 0.5
cm to 29.0 cm. The maximum spectral Doppler velocity range for 2.5 MHz fre-
quency transducers is 16 meters per second, baseline fully shifted. The maxi-
mum spectral Doppler velocity range for 5.0 MHz frequency transducers is 8
meters per second, baseline fully shifted.
All reported accuracies are ± one-half the least significant digit.
