Notes For Acoustic Output Tables For Track 3 - GE VOLUSON 730Pro Basic User Manual

2.13.8

Notes for Acoustic Output Tables for Track 3

Operating Conditions: means the adjustment of the scan parameters on the ultrasound console
MI: is the Mechanical Index in an auto-scanning mode.
TIS scan : is the Soft Tissue Thermal Index in an auto-scanning mode.
TIS non-scan : is the Soft Tissue Thermal Index in a non-autoscanning mode.
TIB: is the Bone Thermal Index.
TIC: is the Cranial Thermal Index.
A aprt : is the area of the active aperture (square centimeters).
p r.3 : is the derated Peak Rarefactional Pressure (megapascals).
W 0 : is the ultrasonic power, except for TIS scan , in which case it is the ultrasonic power
passing through a one centimeter window (milliwatts).
W .3 (z 1 ): is the derated ultrasonic power at axial distance z 1 .
I SPTA.3 (z 1 ): is the derated spatial-peak, temporal-average intensity at axial distance z 1 (milliwatts
per square centimeters).
z 1 : is the axial distance corresponding to the location of max[min(W .3 (z).I TA.3 (z) * 1
cm 2 )], where z³z bp (millimeters).
is 1.69(A aprt ) 1/2 .
z bp :
For MI, z sp : is the axial distance at which p r.3 is measured; for TIB, z sp is the axial distance at
which TIB is a maximum (i.e. z sp = z b.3 ) (millimeters).
d eq (z): is the equivalent beam diameter as a function of axial distance z, and is equal to
[(4/p)(W 0 /I TA (z))]
z (millimeters).
f c : is the center frequency (megahertz).
EBD: are the entrance beam dimensions for the azimuthal and elevational planes
(millimeters).
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PD: is the pulse duration (microseconds).
PRF: is the pulse repetition frequency (kilohertz).
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Voluson 730Pro - Basic User Manual
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, where I TA (z) is the temporal-average intensity as a function of
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