Automated diagnostic hearing test
Method and system are disclosed for automated testing of a patient's hearing. The automated hearing test allows the patient to quickly and accurately test his own hearing with minimal or no assistance from an audiologist or other hearing health professionals. The test prompts and instructs the patient for inputs and responses as needed. The patient can select one or several tests to be performed, including air and bone conduction testing with masking, speech reception threshold, speech discrimination, tympanogram, acoustic reflex, and otoacoustic emissions testing. Multiple languages are supported. Data obtained from one test may be used for another test or another iteration of the same test to calculate masking levels. The automatic hearing test also detects ambient noise and can compensate for it in the test results. If a contingency occurs, the automated hearing test is configured to page the operator for assistance.
1. A system for quickly and conveniently testing a patient's hearing without a sound isolation chamber and with minimal assistance from an operator, comprising:
transducers;
a hearing test device connected to the transducers;
a computer connected to the hearing test device and storing an automated hearing test thereon, the automated hearing test configured to cause the computer to:
present to the patient a list of available hearing tests, including a pure tone test, a speech reception test, and a speech discrimination test;
prompt the patient to select one or more hearing tests from the list of available hearing tests; and
perform each hearing test selected by the patient, wherein test data obtained during one hearing test is used in another hearing test, and test data obtained during one iteration of a hearing test is used in subsequent iterations of that hearing test;
wherein the automated hearing test includes a pure tone frequency module configured to cause the computer to obtain a hearing threshold for a plurality of predetermined frequencies and obtain an unmasked bone conduction hearing threshold for one or more of the predetermined frequencies; and
wherein the automated hearing test further includes a pure tone threshold module configured to cause the computer to, for each frequency being tested, obtain an unmasked bone conduction hearing threshold for the patient, determine a better ear and a poorer ear based on the unmasked bone conduction threshold, and determine one or more hearing thresholds, including at least an air conduction hearing threshold, for the better ear and the poorer ear, and issue a bone conduction threshold warning for the first frequency being tested if the air conduction hearing threshold for the better ear is larger than the unmasked bone conduction threshold by a predetermined amount.
2. The system according to claim 1 , wherein the automated hearing test further causes the computer to prompt the patient to select from a list of available languages to be used for the hearing tests.
3. The system according to claim 1 , wherein the computer is further connected to a tympanometer, and the list of available hearing tests includes a tympanogram test, acoustic reflex test, and otoacoustic emissions test, the automated hearing test further causes computer to acquire tympanogram or acoustic reflex data for each ear of the patient if the tympanogram or acoustic reflex test is selected.
4. The system according to claim 1 , wherein the predetermined frequencies are between 250 Hz and 8000 Hz.
5. The system according to claim 4 , wherein the pure tone module further causes the computer to skip the hearing threshold for certain frequencies if the hearing threshold for other frequencies meet predefined criteria.
6. The system according to claim 1 , wherein the pure tone threshold module further causes the computer to determine, for each frequency being tested, a masked bone hearing threshold for the poorer ear if an air-bone gap for either ear is larger than a predetermined amount.
7. The system according to claim 6 , wherein the pure tone threshold module further causes the computer to determine, for each frequency being tested, a masked bone hearing threshold for the better ear if a masked bone-unmasked bone gap for the poor ear is smaller than a predetermined amount.
8. The system according to claim 7 , wherein the pure tone threshold module further causes the computer to evaluate, for each ear and frequency being tested, whether masking levels used for all hearing thresholds were correct, and to correct the masking levels as needed based on available hearing thresholds.
9. The system according to claim 1 , wherein the automated hearing test further includes a pure tone intensity module configured to cause the computer to determine the one or more hearing threshold by estimating an initial intensity level to be used for each ear and frequency being tested.
10. The system according to claim 9 , wherein the pure tone intensity module further causes the computer to estimate, for each ear and frequency being tested, a masking level to be used and to terminate the estimation if the estimated masking level results in a masking dilemma.
11. The system according to claim 10 , wherein the pure tone intensity module further causes the computer to introduce, for each ear and frequency being tested, a random delay before presenting a tone to the patient if the estimated masking results in a masking level change.
12. The system according to claim 10 , wherein the pure tone intensity module further causes the computer to introduce, for each ear and frequency being tested, a random delay before presenting a tone to the patient if the patient made any previous responses.
13. The system according to claim 10 , wherein the pure tone intensity module further causes the computer to present, for each ear and frequency being tested, a tone with a frequency substantially equal to the frequency being tested.
14. The system according to claim 13 , wherein the pure tone intensity module further causes the computer to, for each ear and frequency being tested, issue a false response warning to the patient if the response is received before the tone presentation and masking is being used for the first time.
15. The system according to claim 13 , wherein the pure tone intensity module further causes the computer to, for each ear and frequency being tested, check whether a hearing threshold is reached upon receiving the response within an acceptable time.
16. The system according to claim 15 , wherein the automated hearing test further includes a threshold detection module configured to cause the computer to check whether a hearing threshold has been reached for the intensity being used by marking the hearing threshold as an overlimit threshold if the patient fails to respond to an intensity near an equipment upper intensity limit.
17. The system according to claim 16 , wherein the threshold detection module further causes the computer to calculate, for the intensity being used, a plurality of threshold indicators, including: a total number of responses at intensities within a predetermined amount of the intensity being used; a number of responses at the intensity being used; a number of non-responses at the intensity being used; a number of non-responses at a lower intensity level that were unaffected by ambient noise; a number of reversals in intensity presentation; and an average of intensity levels where reversals occurred.
18. The system according to claim 17 , wherein a hearing threshold has been reached if the number of responses at the intensity being used is greater than the number of non-responses at the intensity being used, provided the number of responses at the intensity being used is greater than a predetermined minimum response and the intensity being used is greater than a previous intensity used.
19. The system according to claim 18 , wherein the threshold detection module further causes the computer to increase the predetermined minimum response to allow for training.
20. The system according to claim 13 , wherein the pure tone intensity module further causes the computer to measure an ambient noise and calculate an ambient noise indicator.
21. The system according to claim 20 , wherein the ambient noise indicator is an ambient noise threshold shift, and the ambient noise threshold shift must be greater than the current intensity of the tone for a predetermined number of iterations before intensity of the tone is increased.
22. The system according to claim 9 , wherein the automated hearing test further includes a pure tone initial intensity determination module configured to cause the computer to estimate the initial intensity level by presenting a tone to the patient at a predetermined starting intensity and increasing the intensity of the tone by a predetermined increment until the patient responds.
23. The system according to claim 1 , wherein the automated hearing test is further configured to cause the computer to page the operator upon completion of the selected hearing tests.