Operation Manual

MyotonPRO User Manual
Page 21 of 108
2.3 Interferences of Co-oscillation
Every measurement includes automatic interference detection
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to verify if the oscillation of the
tissue being measured was:
1. sufficient for the computing of parameters (see chapter 2.3.1);
2. generated without the Plastic Deformation (see chapter 2.3.2);
3. registered without the Probe Jump Off (see chapter 2.3.3);
4. registered without Excessive Noise (see chapter 2.3.4);
In case of detection of abovementioned interferences the following notices are displayed on the
device screen
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:
1. Measurement data invalid!
2. Plastic deformation detected!
3. Probe jump off detected
4. Excessive noise detected!
2.3.1 Insufficient Tissue oscillation
For measuring the Parameters, the tissue oscillation must be generated with optimal external
mechanical impulse. If the impulse is too small and/or the measured tissue has poor elasticity
and/or high stiffness, the oscillation of tissue is unsatisfactory for the calculation of the
parameters. For calculating the Parameters, the oscillation of the tissue registered as an
acceleration graph must be generated with at least two positive peaks (starting from point a
1
to a
3
of acceleration graph, see Appendix 2). However, it is still recommended to achieve the oscillation
of the tissue with at least three or more positive peaks, as this proves that the oscillation of tissue
was generated with optimal impulse (see Figure 1).
Figure 1: Extensor Digit, Male 45, Left, Relaxed (Tap time 15ms), Raw (blue) and processed signal (red).
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In case of need, interference detections can be deactivated in the Pattern Composer window (chapter 3.4.2, point 11).
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See chapter 3.5.1, point 7.