2 – 32 HS40 Service Manual
after attenuation occurs (unit: MPa)
P
r
at max. I
pi
The peak rarefactional acoustic pressure at the location where PULSE-
INTENSITY INTEGRAL is maximal (unit: MPa)
prr PULSE REPETITION RATE, the inverse number of the time interval
between two contiguous acoustic pulses (unit: Hz)
TIB BONE THERMAL INDEX, a thermal index for a focal zone formed near a
bone after the ultrasound beam passes through soft tissue, e.g. applied
to a fetus (in the 2nd or 3rd trimester) or to the head of a neonate
(through the fontanel) (unit: N/A)
TIC CRANIAL BONE THERMAL INDEX, a thermal index for an ultrasound
beam entering the body and passing through a bone, e.g. the skull of
children or adults (unit: N/A)
TIS
scan
Soft tissue thermal index in scanning mode (unit: N/A)
TIS
non-scan
Soft tissue thermal index in non-scanning mode (unit: N/A)
t
d
PULSE DURATION (unit: us)
z_at_max_Ipi,
α
Location where PULSE-INTENSITY INTEGRAL is maximal (unit: cm)
z
b
DEPTH FOR BONE THERMAL INDEX (unit: cm)
z
bp
BREAK-POINT DEPTH, which is the EQUIVALENT APERTURE
DIAMETER multiplied by 1.5 (unit: cm)
z
s
DEPTH FOR SOFT-TISSUE THERMAL INDEX, the distance from a
plane where the product of minimum attenuated output power,
ATTENUATED SPATIAL-PEAK TEMPORAL-AVERAGE INTENSITY,
and 1 cm
2
is maximal at the distance range that is equal to, or greater
than, the equivalent aperture diameter multiplied by 1.5, when the beam
dimension of -12dB output is defined along the beam alignment axis (unit:
cm)
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