M2540-92000-01 A M2540 Ultrasound System Field Service Manual Page 28
Safety: AIUM/NEMA Output Display Standard
•Reduce exposure time, independent of acoustic index value.
•Use techniques that let you collect clinical data quickly and end the examination promptly.
•Select a transducer that provides good resolution and focal depth for the region of interest.
Then use the imaging controls to fine-tune image resolution.
For more detailed information on acoustic exposure, see the Output Display Standards and ODS
Acoustic Tables booklet.
AIUM/NEMA Output Display Standard In compliance with the Output Display Standard (ODS) jointly proposed by the American
Institute of Ultrasound in Medicine and the National Electrical Manufacturers Association, the
Philips ultrasound system displays power output indices related to the potential for bioeffects.
Real-time information related to the power output is displayed on the monitor, indicating the
type of index displayed and the value of that index for the acoustic output currently being used.
For example, if the output corresponds to a mechanical index of 0.8, the following is displayed:
MI: 0.8
The displayed index is one of four types: MI, TIS, TIB, or TIC. These ultrasound abbreviations
conform to the AIUM/NEMA Output Display Standard.
Soft tissue thermal index (TIS) is used in cardiac, fetal, and abdominal scanning.
The thermal index for bone (TIB) is used in applications such as second or third trimester fetal
scanning and neonatal cephalic (through the fontanelle) scanning.
The cranial bone thermal index (TIC) is used for transcranial imaging.