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Reference Manual 110

at max. I

the PEAK-RAREFACTIONAL ACOUSTIC PRESSURE at the point where the free -eld

(non-attenuated), PULSE INTENSITY INTEGRAL is a maximum (megapascals).

prr the PULSE REPETITION RATE associated with the transmit pattern giving rise to

the reported value of MI (pulses per second).

TIB the BONE THERMAL INDEX for applications, such as fetal (second and third

trimester) or neonatal cephalic (through the fontanelle), in which the ultrasound

beam passes through soft tissue and a focal region is in the immediate vicinity of

bone. (unit-less)

TIC the CRANIAL BONE THERMAL INDEX.

Sscan

the SOFT TISSUE THERMAL INDEX in a scanning mode. (unit-less)

TIS

non-scan

the SOFT TISSUE THERMAL INDEX in a non-auto scanning mode. (unit-less)

td the PULSE DURATION associated with the TRANSMIT PATTERN giving rise to the

reported value of MI. (microseconds)

z_at_max_Ipi,

the axial distance from the transducer where the ATTENUATED PULSE INTENSITY

INTEGRAL Ipi,α is maximum.

the distance where TIB_non-scan is determined. For non-scanned modes, Dis-

tance along the beam axis to the plane where the product of the ATTENUATED

OUTPUT POWER and ATTENUATED TEMPORAL-AVERAGE INTENSITY (Pα (z) x Ita,α

(z)) maximizes. (centimeters)

value equal to 1.5 times the EQUIVALENT APERTURE DIAMETER (Deq). Also equals

1.69 * (centimeters)

the distance where TIS_non-scan is determined. The axial distance corresponding

to the location of max[min (Pα (z), Ita,α (z)x1 cm2)], where z >= zbp. (centimeters)

Explanatory Notes

(a) This index is not required to this operating mode.

(b) This probe is not intended for adult transcranial uses.

(d) The maximum index value is less than 1.0

* If the MI comes from a scanning mode Transmit Pattern (pulse), the ‘prr’ listed is the average

per second for the ‘worst case’ scan line. ‘prr’ for scanning modes is the product of the frame

rate and the number of pulse per line of the Transmit Pattern.

** The max TIS unscanned value is an ‘at_surface’ value and occurs for aperture > 1.0 cm

, OR

The max TIS unscanned value is a ‘below_surface’ value and occurs for aperture <= 1.0 cm

+ The max TIB for this combinational mode = the at_surface TIS_scanned value. The non-

scanned_TIB value indicated is the below_surface max. A “+” is used when the TIB value is

less than the TIS_scanned value for the operating condition.

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