Watanabe Hiroshi, Kuribayashi Ami, Sumi Yasunori, Kurabayashi Tohru
1 Department of Oral and Maxillofacial Radiology, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.
2 National Center of Advanced Medicine for Dental and Oral Diseases, National Center for Geriatrics and Gerontology, Obu, Japan.
Dentomaxillofac Radiol. 2017 Mar;46(3):20160358. doi: 10.1259/dmfr.20160358. Epub 2017 Jan 6.
The purpose of this study was to clarify the resolution characteristics of optical coherence tomography (OCT) for dental use.
Two types of swept-source optical coherence tomography machines were employed in this study. To clarify their resolution characteristics, we newly developed a glass chart device with a ladder pattern of wavelengths, which ranged from 4 × 2 μm to 1024 × 2 μm, as well as a star-target pattern, a grid pattern and a spatial frequency response pattern. The resolving powers and characteristics of the OCTs were subjectively evaluated.
The Santec OCT-2000 (Santec Co., Komaki, Japan) had a resolving power of 64 μm in both the horizontal X and vertical Y directions, while the OCT from Yoshida had a resolving power of 64 μm in the horizontal X direction and 128 µm in the vertical Y direction. The resolving power of the depth Z direction could not be obtained from this study. With the Yoshida OCT, the star-target pattern seemed to be non-symmetrical, owing to an edge enhancement effect, which was revealed when the ladder patterns were placed in a horizontal direction.
This study successfully clarified the resolution characteristics of two types of OCTs. The obtained data may be useful for diagnostic purposes, and the glass chart device used in this study may be useful for OCT quality assurance programmes.
本研究旨在阐明牙科用光学相干断层扫描（OCT）的分辨率特性。
本研究采用了两种扫频光学相干断层扫描设备。为了阐明它们的分辨率特性，我们新开发了一种玻璃图表装置，其具有波长范围从4×2μm到1024×2μm的阶梯图案，以及星靶图案、网格图案和空间频率响应图案。对OCT的分辨能力和特性进行了主观评估。
Santec OCT - 2000（日本小牧市Santec公司）在水平X方向和垂直Y方向的分辨率均为64μm，而吉田的OCT在水平X方向的分辨率为64μm，在垂直Y方向的分辨率为128μm。本研究无法获得深度Z方向的分辨率。使用吉田OCT时，由于边缘增强效应，星靶图案似乎不对称，当阶梯图案水平放置时这种效应会显现出来。
本研究成功阐明了两种OCT的分辨率特性。所获得的数据可能对诊断有用，并且本研究中使用的玻璃图表装置可能对OCT质量保证计划有用。
