User's Manual

Safety
2-20
Vscan Air
–
User Manual
Direction GP092020-1EN
Rev 08
In eye scanning applications, it is recommended that TI is
monitored. TI values should be limited to a maximum of 1.0.
Selecting preset
Selecting the appropriate preset for a particular ultrasound
examination automatically provides acoustic output limits within
FDA guidance for that examination. Other parameters which
optimize performance for the selected examination are also set
automatically, and should help reducing the patient exposure
time.
Changing imaging modes
Acoustic output depends on the imaging mode selected. This
greatly affects the energy absorbed by the tissue, as described
in ‘Black/white imaging (B-mode)’ on page 5-15 and ‘Color flow
(Color doppler)’ on page 5-19.
Table 2-6: Recommended maximum scanning times (Neonatal- Transcranial and
Spinal scanning)
Neonatal- Transcranial and Spinal
scanning
Neonatal - General and Cardiac
imaging
TI time TI time Note
0.0–0.7 Unlimited 0.0–0.7 Unlimited Monitor TI
0.7–1.0 < 60 min 0.7–1.0 Unlimited
1.0–1.5 < 30 min 1.0-1.5 120 min
1.5–2.0 < 15 min 1.5-2.0 60 min
2.0–2.5 < 4 min 2.0-2.5 15 min
2.5–3.0 < 1 min 2.5-3.0 4 min
3.0-4.0 Scanning of the central
nervous system is not
recommended
3.0-4.0 1 min
References
• The British Medical Ultrasound Society. Guidelines for the safe use of diagnostic ultrasound equipment.
• American Institute of Ultrasound in Medicine Consensus Report on Potential Bioeffects of Diagnostic
Ultrasound.