THE ACOUSTIC STETHOSCOPE USING ULTRASONIC PULSER DEVICE FOR THE PERIODONTAL TISSUES

近年来，利用超声波装置对生物组织进行功能监测和形态学检测的声传感方法在医学领域得到了广泛的应用。超声是非电离性质的，相对安全，具有非侵入性和非破坏性监测患者结构和功能状态的能力。在从超声波探头发送的声波在其中传播的生物组织中，在声速不同的组织中的边界中产生回波。超声层析成像技术是利用组织中不同声学介质层的回声来检测牙周组织的声学特性，本研究设计了一套检测系统，用于检测牙周组织的功能和结构状况。对志愿者进行了口腔组织超声波声学调查。高频超声源（20MHz）应用于下颌骨， 关于我们 使用声探头通过延迟线对牙槽部分上方的额部皮肤或牙龈表面进行测量。与目标组织连接的探头的延迟线将从活组织获得的回波传输到接收器，同时将声音传输到组织。声探头上与皮肤连接的部分的直径为2mm。声束在牙周组织中的传播在不同组织层的边界上产生回声。在示波器上测量牙周组织的回波波形，并重复叠加50次，然后取平均值。在前唇粘膜上获得的牙槽骨表面和具有健康牙周组织的牙龈表面上产生的密集的尖锐尖峰。另一方面，从发炎的牙周牙龈没有得到密集的尖峰。同时在牙周炎治愈和恢复后牙槽骨突消失的牙龈组织上获得一组小棘波。这些棘突似乎指示了无牙周病的健康软组织中各层之间的边界点。我们可以从牙周组织表皮的回波波形中检测出标志健康牙周组织的信号，而不需要昂贵的超声设备的二维检测系统。少

Acoustic sensing methods using ultrasound devices for the functional monitoring and morphological inspection of biological tissues are recently receiving widespread through medical field. Ultrasound being non-ionizing nature, are relatively safe have capabilities for the non-invasive and non-destructive monitoring of the structural and functional states of patients. In the biological tissues in which the acoustic wave sent from ultrasonic probe is propagated, the echo is generated in the boundary in the organization in which the sound velocity differs. The ultrasonic tomography detects the echo got from the layer which differs as acoustic medium in the tissues.In this study, we designed the detection system to obtain acoustic properties from human periodontal tissues for inspecting functional and structural conditions. The acoustic investigation by the ultrasonic wave for oral tissue was carried out for the volunteer. High frequency, ultrasound source (20MHz) was applied to the mandibl … More e frontal skin over the alveolar portion, or to the surface of gingival using the acoustic probe via delay line. The delay line of the probe with the connection to the target tissue transmitted the echo which was obtained from the live tissue to the receiver, while the sound was transmitted to the tissue. The diameter of the attached portion to the skin on the acoustic probe was 2mm. The transmitted sound beam to the periodontal tissue generated the echoes on the boundary between the layers of different tissues. The echo waveforms from the periodontal tissues were measured on the oscilloscope and was added 50 times repeatedly, then averaged. An intensive sharp spike which was generated at the surface of alveolar bone obtained on the frontal labial mucosa, and on the gingival surface having healthy periodontal tissue. On the other hand, no intensive spike was not obtained from the inflamed periodontal gingival. A group of the small spike wave were obtained simultaneously on the gingival tissues which had lose the processes of alveolar bone then have been cured and recovered from periodontitis. These spikes were seemed to indicate the boundary points between the layers in the healthy soft tissue free from periodontal desease. We could detected the distinguished signal signed the healthy periodontal tissue from the echo waveforms from epidermis of periodontal tissues without a two-dimensional inspection system which was required very expensive ultrasound equipments. Less