IEC 62359:2010/COR1:2011

IEC 62359
(Second edition – 2010)
Ultrasonics – Field characterization – Test methods for the determination of thermal
and mechanical indices related to medical diagnostic ultrasonic fields

CO RRI G E NDUM 1
3.1
acoustic attenuation coefficient
Replace NOTE 2 by the following:
-
-1 1
NOTE 2 Acoustic attenuation coefficient is expressed in decibels per metre per hertz (dB m Hz ).

3.2
acoustic absorption coefficient
Replace NOTE 2 by the following:
-
-1 1
NOTE 2 Acoustic absorption coefficient is expressed in neper per metre per hertz (Np m Hz ).
3.4.2
arithmetic-mean acoustic-working frequency
Add the following NOTE 3:
NOTE 3 If f is not found within the range < 3 f , f is to be understood as the lowest frequency above this range
2 1 2
at which the spectrum magnitude is -3 dB from the peak magnitude.
4 List of symbols
Replace
µ
acoustic absorption coefficient
by
µ
0 acoustic absorption coefficient
A.4.1.4 Rationale for the bounded-square output power and attenuated bounded-square output
power
In the second paragraph, seventh line, replace “attenuated bounded square output power” by
“attenuated bounded-square output power”.
Delete the parenthesis at the end of the second paragraph.
March 2011
A.4.2.1 Derivation of break-point depth
In Equation A.3, change the font of the value 1,13 from New Times Roman italics to Arial
upright.
A.4.3 Derivation notes for the thermal models used
-1 -1 -1 -1
In the fourth paragraph, replace µ = 0,1 NP cm MHz by µ = 0,1 Np cm MHz .
o o
Replace equation A.11 by the following:
-2
210 mW MHz
(21 Np ⋅ mW ⋅ cm ) (1,0 cm)
P = =ˆ
deg
-1 -1
(0,1 Np ⋅ cm ⋅MHz ) ( f ) f
awf awf
B.3.2 Measurements with beams scanning
In the
...