Toshiba Aplio 500 TUS-A500, Operation Manual

Page: 210 / 232

No. 2B771-004EN*M
24-15
24.2.6 Information contained in the system documentation
Information from AIUM and FDA is included in the system documentation. This
information details the basics of ultrasound, the mechanical and thermal indices, their
clinical and biological meaning, and information on the ALARA principal.
The included information is extremely important for the understanding and use of the
system. It will help yield effective diagnostic images while keeping acoustic exposure
as low as possible. You are strongly encouraged to read this information.
The information following this section describes the operational controls which affect the
MI/TI values and the acoustic exposure to the patient. These controls should be
understood by the user and their effects should be observed prior to the performance of
examinations.
24.2.7 Measurement uncertainty and precision
The total estimated measurement uncertainty (where the total uncertainty includes the
uncertainties in hydrophone response, measurement, calculation, and positioning) are:
Expanded uncertainty
Ispta 19.8%
Isppa 19.8%
Center frequency (fc) 1.9%
Total power (W) 6.2%
Rarefactional pressure (pr) 9.8%
(k=2.132, C.I.=90%)
24.2.8 Reminder
As a reminder, Always Practice ALARA . The display gives information in real time
and therefore shows the current acoustic exposure rates to the tissue or structure being
insonated.
For inquiries and information, contact your TOSHIBA service representative.
Additionally, as further information becomes available, we will do our utmost to keep
you informed.