Sportec 27512 Mode D'emploi page 56

3 MHz
BNR (Beam Non-uniformity Ratio)
Side radiation
0.8 cm² Applicator
Ultrasound frequency:
1 MHz
3 MHz
ERA (Effective Radiation Area):
IEC 60601-2-5: 2000
21 CFR 1050.10
Beam type:
1 MHz
3 MHz
BNR (Beam Non-uniformity Ratio)
Side radiation
Description of ultrasound field
The spatial distribution of the radiated field is a collimated beam (diverging for the 0.8 cm² applicator at 3
MHz) of ultrasound energy, with a decreasing Amplitude at increasing distance from the applicator
surface. This field distribution applies to the radiation emitted into the equivalent of an infinite medium of
distilled, degassed water at 30 ºC and with line voltage variations in the range of ± 10% of the rated value.
The ultrasonic beam is characterized by the Effective Radiation Area (ERA) and the Beam Non-
uniformity Ratio (BNR).
The Effective Radiation Area is the cross-sectional area of the ultrasound beam. Its value depends on the
ultrasound standard used:

International: IEC 60601-2-5: 2000

USA: 21 CFR 1050.10
The Beam Non-uniformity Ratio is the ratio of the maximum ultrasound Amplitude to the average
ultrasound Amplitude, measured at the Effective Radiation Area. A low BNR value is indicative for the
absence of high and potentially dangerous energy concentrations.
Amplitude Duty
modulatie cycle Pulsduur
16Hz 5% 3.1ms
16Hz 10% 6.3ms
16Hz 20% 12.5ms
16Hz 33% 20.6ms
16Hz 50% 31.3ms
16Hz 80%
16Hz 100%* 62.5ms
48Hz 5%
48Hz 10% 2.1ms
48Hz 20% 4.2ms
48Hz 33% 6.9ms
48Hz 50% 10.4ms
48Hz 80% 16.7ms
48Hz 100%* 20.8ms
100Hz 5% 0.5ms
100Hz 10%
100Hz 20%
100Hz 33% 3.3ms
100Hz 50%
100Hz 80%
100Hz 100%*
* = continuous mode
: Collimating
: 6:1 maximum
: 10 mW/cm² maximum
: 0.98 MHz ± 2 %
: 3.1 MHz ± 2 %
: 0,6 cm²
: 0,8 cm²
: Collimating
: Diverging
: 6:1 maximum
: 10 mW/cm² maximum
RTPA
20
10
5
3
2
50ms 1.25
1
1ms 20
10
5
3.33
2
1.25
1
20
1ms 10
2ms 5
3.33
5ms 2
8ms 1.25
10ms 1
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