-------------------------
r
Dosage in total watts, or watts per
square
centimeter,
and
treatment
time
may vary from patient-to-patient
and
with
areas
to be treated. Generally,
the
transducer
(applicator) is moved ina slow, steady rotary or stroking motion at
the approximate rate of 24
square
inches
(l55cm
2
)
per
minute. Most
treatments
require repetition over this
area
for a period of five minutes.
For
a
few
hours
duration after ultrasonic treatment, the pain may increase. If this
occurs,
treatments
should be continued
but
with a slight reduction intime and
power. Frequency of treatment varies from
once
daily to three times
per
week.
OUTPUT
LEVELS:
The
differences
between
transducers
of varying radiating
areas
are
shown
below.
The
chart
is a calculation of power
output
for
three
transducer
crystals
with different radiating areas.
Intensity Setting
Crystal Effective
Effective
Watts
(W/cm
2
)
Radiating Area
Produced
1.5
5
ern-
7.5 W
1.5
6 em?
9.0W
1.5
10 ern-
15.0 W
You
will
note, though the intensity setting remained constant, the
amount
of
energy delivered varied
...
appreciably. We caution you to consider this since
units of different manufacture
are
available in many departments. If watts
per
square
centimeter is used as the prescribed intensity setting,
the
effective
watts delivered
will
not remain constant.
For
this reason, we suggest
that
using average power,
or
WATTS, as the
intensity setting insures the
amount
delivered by any unit
and
any sized
crystal remains
constant
as
desired.
10
;,
....
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