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Reference Manual 118

FDA Tables

Symbols and Denitions

All table entries have been obtained at the same operating conditions that give rise to

the maximum Index Value in the second row. Due to the complexities of the system user

interface, it may be dicult to exactly replicate the declared condition. Contact Samsung

Medison for further information.

Symbols used in the table are described below.

MI the Mechanical Index.

TIS

scan

the Soft Tissue Thermal Index in an auto-scanning mode.

TIS

non–scan

the Soft Tissue Thermal Index in a non-auto-scanning mode.

TIB the Bone Thermal Index.

TIC the Cranial Thermal Index.

aprt

the area of the active aperture (square centimeters).

r.3

the derated peak rarefactional pressure associated with the transmit

pattern giving rise to the value reported under MI (meg zapascals).

For TIB and TIC: time average acoustic power at the source, in milliwatts.

(Also see the denitions for W

and W

01x1

that follow.)

For TIS scan, W

o =

o1x1

For TIS non–scan, W

o1x1

For scanning modes and/or scanning components of combinational modes: time

average acoustic power at the source, per cm, in milliwatts. This is the acoustic

power emitted from the central 1–cm length, in the scan direction, of the aperture

corresponding to the scanned pulses.

o1x1

For non–scanning modes and/or non–scanning components of

combinational modes: time average acoustic power at the source, per

, 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/ )(W

(z))]

0.5

where I

(z) is the temporal-average intensity as

a function of z (centimeters).

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 combined 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

(centimeters).

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”.

@PII

max

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).

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