Page 13 of 87 DGH 55B-INS-OMENG Rev: 3
where I
t
is the estimated in situ intensity, I
w
is the measured intensity in water at the focus of the
transducer, f is the ultrasonic frequency, and z is the distance from the face of the probe to the
transducer focus, which is the point of measurement (3 millimeter).
The nominal piezoceramic (crystal) frequency of these transducers is 20 MHz. The actual
frequency of a particular transducer may vary from this value. The tissue calculations above
were done with the measured frequency of the transducer used for the tests.
5.3 Biometric Measurement Capabilities
The following table shows the measurement range for the DGH 55B Ultrasonic Pachymeter
(Pachmate 2)
Measurement Option: Standard Unit
Range (µm): 200 – 1100 µm
Accuracy (µm): 5µm
Display Resolution (µm): 1 µm
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