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Teleradiology in dental panoramic images

牙科全景图像中的远程放射学

基本信息

批准号：
09671931
负责人：
OKANO Tomohiro
金额：
$ 2.18万
依托单位：
Showa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

The study consisted of two parts. One was to clarify the effects of the resolution and compression film-based digitized panoramic images on diagnostic accuracy. The other was to evaluate the applicat* of the digital panoramic imaging system to teleradiology. In the first part, the panoramic images wilt non-demarcated radiolucent lesions and without such lesions were digitized and evaluated on diagno accuracy. Two types of scanners were used : specially fabricated one for radiograph and the regular The resolution was 75 and 150 dpi. Image compression had four levels : the uncompressed TIFF format and the low, middle and high compressed JPEG format. The images attached to e-mail were transfered using 14400 bps modem. The results showed that I) there was a little difference between the scanner 2) the spatial resolution showed the relatively small effects in the range used, and 3) the compression had the critical effects on the accuracy. The results indicated that the low compressed JPEG file with resolution of 75 or 150 dpi was appropriate for a special scanner and the low compressed JPEG file' 150 dpi for a general purpose scanner. In the second part, the digital panoramic CCD system c Digipan (Trophy, France) was used attached to an ordinary panoramic unit (OP100, Instrumentan Finland). The images obtained from the patients were evaluated for the visibility of the contour internal structures of the mandible, the teeth and surrounding structures, and the lower border of maxillary sinus. The compressed JPEG images were also evaluated. The results showed that 1) mo* the uncompressed and compressed images were acceptable for the general diagnostic purposes, an* the time required to send the compressed file ranged between I and 20 seconds on 1NS64. The re* indicated that a digital panoramic machine could be useful for teleradiology in dentistry.

该研究由两部分组成。一是阐明基于胶片的数字化全景图像的分辨率和压缩对诊断准确性的影响。另一个是评估数字全景成像系统在远程放射学中的应用*。在第一部分中，将全景图像数字化，对未划界的射线可透病变和无此类病变的全景图像进行数字化并评估诊断准确性。使用两种类型的扫描仪：一种是专门为射线照相而制造的，另一种是常规的。分辨率为 75 dpi 和 150 dpi。图像压缩有四个级别：未压缩的TIFF格式和低、中、高压缩的JPEG格式。电子邮件中附加的图像是使用 14400 bps 调制解调器传输的。结果表明，I) 扫描仪之间存在一些差异，2) 空间分辨率在所使用的范围内显示出相对较小的影响，3) 压缩对精度有关键影响。结果表明，分辨率为 75 或 150 dpi 的低压缩 JPEG 文件适合专用扫描仪，而分辨率为 150 dpi 的低压缩 JPEG 文件适合通用扫描仪。在第二部分中，使用连接到普通全景单元（OP100，芬兰仪器公司）的数字全景 CCD 系统 c Digipan（Trophy，法国）。对从患者获得的图像评估下颌骨轮廓内部结构、牙齿和周围结构以及上颌窦下缘的可见度。还评估了压缩的 JPEG 图像。结果表明，1) mo* 未压缩和压缩的图像对于一般诊断目的来说是可以接受的，并且* 在 1NS64 上发送压缩文件所需的时间在 1 秒到 20 秒之间。重新*表明数字全景机可用于牙科远程放射学。