In Vivo Vibration Measurement of Middle Ear Structure Using Doppler Optical Coherence Tomography: Preliminary Study

OBJECTIVES: Doppler optical coherence tomography (DOCT) is useful for both, the spatially resolved measurement of the tympanic membrane (TM) oscillation and high-resolution imaging. We demonstrated a new technique capable of providing real-time two-dimensional Doppler OCT image of rapidly oscillatory latex mini-drum and in vivo rat TM and ossicles. METHODS: Using DOCT system, the oscillation of sample was measured at frequency range of 1–4 kHz at an output of 15 W. After the sensitivity of the DOCT system was verified using a latex mini-drum consisting of a 100 μm-thick latex membrane, changes in displacement of the umbo and contacted area between TM and malleus in normal and pathologic conditions. RESULTS: The oscillation cycles of the mini-drum for stimulus frequencies were 1.006 kHz for 1 kHz, 2.012 kHz for 2kHz, and 3.912 kHz for 4 kHz, which means that the oscillation cycle of the mini-drum become short in proportional to the frequency of stimuli. The oscillation cycles of umbo area and the junction area in normal TM for frequencies of the stimuli showed similar integer ratio with the data of latex mini-drum for stimuli less than 4 kHz. In the case of middle ear effusion condition, the Doppler signal showed a tendency of attenuation in all frequencies, which was prominent at 1 kHz and 2 kHz. CONCLUSION: The TM vibration under sound stimulation with frequencies from 1 kHz to 4 kHz in normal and pathologic conditions was demonstrated using signal demodulation method in in vivo condition. The OCT technology could be helpful for functional and structural assessment as an optional modality.

Optical Coherence Tomography for the Diagnosis and Evaluation of Human Otitis Media

We report the application of optical coherence tomography (OCT) to the diagnosis and evaluation of otitis media (OM). Whereas conventional diagnostic modalities for OM, including standard and pneumatic otoscopy, are limited to visualizing the surface of the tympanic membrane (TM), OCT effectively reveals the depth-resolved microstructure below the TM with very high spatial resolution, with the potential advantage of its use for diagnosing different types of OM. We examined the use of 840-nm spectral domain-OCT (SD-OCT) clinically, using normal ears and ears with the adhesive and effusion types of OM. Specific features were identified in two-dimensional OCT images of abnormal TMs, compared to images of healthy TMs. Analysis of the A-scan (axial depth scan) identified unique patterns of constituents within the effusions. The OCT images could not only be used to construct a database for the diagnosis and classification of OM but OCT might also represent an upgrade over current otoscopy techniques.

Optical Coherence Tomography for the Diagnosis and Evaluation of Human Otitis Media

We report the application of optical coherence tomography (OCT) to the diagnosis and evaluation of otitis media (OM). Whereas conventional diagnostic modalities for OM, including standard and pneumatic otoscopy, are limited to visualizing the surface of the tympanic membrane (TM), OCT effectively reveals the depth-resolved microstructure below the TM with very high spatial resolution, with the potential advantage of its use for diagnosing different types of OM. We examined the use of 840-nm spectral domain-OCT (SD-OCT) clinically, using normal ears and ears with the adhesive and effusion types of OM. Specific features were identified in two-dimensional OCT images of abnormal TMs, compared to images of healthy TMs. Analysis of the A-scan (axial depth scan) identified unique patterns of constituents within the effusions. The OCT images could not only be used to construct a database for the diagnosis and classification of OM but OCT might also represent an upgrade over current otoscopy techniques.

Erratum: Optical Coherence Tomography for the Diagnosis and Evaluation of Human Otitis Media

We made two mistakes in our recently published article. We are correcting the authorship and funding information.

A Comparative Study on the Therapeutic Setting of the Open and the Closed Ward in Mental Hospital / 신경정신의학

OBJECTIVES: The treatment setting of mental hospital has a great influence on the outcome of treatment. The authors compared the characteristics of treatment setting of the open and the closed wards in a mental hospital and the attitudes of the staff and patients on each ward. METHODS: Total four wards two typical open wards and two typical closed wards were selected and each contained one male ward and one female ward. Ward Atmosphere Scale(WAS) was conducted to each and the mean scores of suscales of WAS were compared by using Student's t-test. RESULTS: 1) The closed ward was similar to the treatment setting of control-oriented program which stresses the stator control and the nile of ward and ignores the autonomy of patients and such a evaluation was perceived more by the patients than by the staff. 2) The open ward supported and encouraged the staff and patients and focused on solving the practical problems of the patients, and especially the staff perceived it as the treatment program the activated ward. 3) It was shown that the open ward was more therapeutic and while it focused on the autonomous problem solving, the closed ward pup enguasis on the protection of patients. In addition, the patients were more sensitive to the difference of setting between the two wards than the star. CONCLUSION: In conclusion, if various and realistic programs were offered to the patients in the ward, the open ward would be proposed as a desirable therapeutic form for the chronic psychiatric inpatients.