Samsung SONOACE R5 Manual do Utilizador descarregar pdf (Página 436)

Reference Manual 128

o1x1

: For non–scanning modes and/or non–scanning components of combi-

national modes: time average acoustic power at the source, per cm

, in

milliwatts. This is the acoustic power emitted from the central 1 cm

of the

active non–scanned aperture through which the highest acoustic power is

being transmitted.

) the derated ultrasonic power at axial distance z

(milliwatts).

TA.3

) the derated spatial-peak, temporal-average intensity at axial distance z

(milliwatts

per square centimeter).

the axial distance corresponding to the location of max[min (W

(z), I

TA.3

(z) x 1 cm

)],

where z = z

(centimeters).

For MI, the axial distance at which p

r.3

is measured for TIB, the axial distance at which

TIB is a maximum (i.e., z

= z

B.3

) (centimeters).

(z) the equivalent beam diameter as a function of axial distance z, and is equal to [ (4/ )

(z))]

0.5

where I

(z) is the temporal-average intensity as a function of z (centi-

meters).

is the center frequency (MHz). For MI, f

is the center frequency associated with the

transmit pattern giving rise to the maximum reported value of MI. For TI, for com-

bined modes involving transmit patterns of unequal center frequency, f

is dened

as the overall range of center frequencies of the respective transmit patterns.

Dim. of A

aprt

the active aperture dimensions for the azimuthal and elevational planes (centime-

ters).

PD the pulse duration (microseconds) associated with the transmit pattern giving rise

to the reported value of MI.

PRF the pulse repetition frequency associated with the transmit pattern giving rise to the

reported value of MI (Hz).

@PII

max

the peak rarefactional pressure at the point where the free eld, spatial-peak pulse

intensity integral is a maximum (megapascals). See Section 6.2.4.1 of the Output

Display Standard, entitled “Measurement Methodology for Mechanical and Thermal

Indices”.

deq@PIImax the equivalent beam diameter at the point where the free eld, spatial-peak pulse

intensity integral is a maximum (centimeters). See Section 6.2.5.1 of the Output

Display Standard, entitled “Measurement Methodology for Mechanical and Thermal

Indices”.

FL the focal length, or azimuthal and elevational lengths, if dierent (centimeters).

PA.3

@MI

max

the derated pulse average intensity at the point of maximum reported MI (Watts per

square centimeter).

Measurement uncertainties for acoustic quantities (power, pressure, intensities and center frequency)

should be provided.

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

* PRF for scanning modes is the product of the frame rate and the number of pulse per line

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