HAC Acoustic Technologies

Equipment
for Hi-Tech Assessment of Nasality

NasometerTM II, Model 6450, is the newest hardware/software version of the acclaimed Nasometer which PENTAX introduced in 1986. Since that time, the Nasometer has become a standard clinical tool, worldwide, for assessment and treatment of patients with nasality problems. The instrument's success is based on its simplicity, noninvasiveness, easily interpretable data, and validity.

Simple, Innovative Design

Nasometer II uses an innovative headset device, worn by the patient, which separates the oral and nasal cavities witha baffle plate. Microphones mounted on the top and bottom of the plate collect acoustic energy during speech. The instrument computes a ratio of the acoustic data acquired by the two microphones. This ratio is termed nasalance (the acoustic correlate of perceived nasality) and is displayed as a percent, with higher percentages representing increased nasalance

The Nasometer II headset overcomes the disadvantages of invasive devices and hand-held masks. Masks muffle the patient's speech and severely degrade auditory feedback. The Nasometer II offers clear auditory playback of patient's speech production for use in assessment and therapy.

strong Tested and Proven

The Nasometer II method of computing nasality has been shown to correlate well with other instrumental techniques (e.g., pressure/flow measurements and photodetection) as well as perceptual studies. Normative data have been computed in a large number of languages internationally. Speech pathologists, otolaryngologists, and plastic surgeons use the instrument to help objectify and supplement their diagnostic, follow-up testing, and treatment protocols. A bibliography of the extensive research, normative studies, and application of the Nasometer is available directly from PENTAX or can be found on the PENTAX Web site.

NEW - Portable

The Nasometer II software provides built-in prompts with the most commonly used clinical stimuli sentences, including the Zoo Passage, Nasal Sentences, and the Rainbow Passage. Results of a patient's assessment can be compared to the built-in, or other published, norms of nasalance values. The software also offers the option of using picture stimuli files from the SNAP test (MacKay/Kummer) for assessment of preliterate children. Additionally, the games program that is included allows children (and adults) to monitor nasalance and provides graphic rewards to the client.

Use for Assessment and Therapy

Statistical analysis results (nasalance values) can be used to document performance and monitor patient progress over the course of therapy or before and after surgery, or prosthetic fitting. In addition, auditory feedback coupled with real-time visual feedback provides an optimal tool for therapy tasks. The real-time display of Nasometer II enables clients to monitor their velopharyngeal control during speech.

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