GE Vscan Air Manual page 56

Safety
Sensitive tissues
Table 2-5:
Obstetric scanning
TI
0.0–0.7 Unlimited
0.7–1.0 < 60 min
1.0–1.5 < 30 min
1.5–2.0 < 15 min
2.0–2.5 < 4 min
2.5–3.0 < 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.
2-20
Particular care should be taken to reduce the risk of thermal
hazard when exposing the following to diagnostic ultrasound:
- an embryo less than eight weeks after conception;
- the head, brain or spine of any fetus or neonate;
- an eye (in a subject of any age).
The British Medical Ultrasound Society has suggested some
maximum scanning times relative to displayed TI as follows:
Recommended maximum scanning times
General Abdominal, Peripheral
Vascular, Musculoskeletal, Cardiac
and other not listed applications
time TI
0.0–1.0
1.0–1.5
1.5–2.0
2.0–2.5
2.5–3.0
3.0–4.0
Further guidance on the safe use of obstetric ultrasound can be
found in the Official statements of the American Institute of
Ultrasound in Medicine (AIUM) – "Prudent Use and Safety of
Diagnostic Ultrasound in Pregnancy."
time
Unlimited
< 120 min
< 60 min
< 15 min
< 4 min
< 1 min
Vscan Air
Direction GP092020-1EN Rev 18
Note
Monitor TI
–
User Manual