Bone Conductor
Note
•
For unmasked bone thresholds, you can store binaural data:
- Select
Both
in the
Ear Selection
part of the control panel.
If there is a difference of 10 dB or greater between the bone conduction threshold and the air conduction threshold of
the same ear, masking is needed. The Masking Assistant can assist you in determining which thresholds need to be
masked.
If the SRT of the test ear and the bone conduction PTA of the nontest ear differ by 45 dB or more, masking is needed.
Mastoid placement
1. Move any hair covering the mastoid out of the way and place the flat round part of the bone conductor securely on
the boniest portion of the mastoid without any part of the transducer touching the external ear.
2. Make sure the bone conductor is tight on the mastoid but still comfortable.
3. If you are going to perform masking with earphones, position the other end of the bone conductor headband over the
patient's temple on the opposite side of the head so that the headband of the earphones and bone conductor fit on
the patient's head.
62
Madsen A450
4 Preparing the client
