小照射野X線CTの実用機"3DX Multi Image Micro CT"の基本性能
小照射野X線CTの実用機"3DX Multi Image Micro CT"の基本性能
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实用型小视场X射线CT设备3DX Multi Image Micro CT的基本性能
DOI：
10.11242/dentalradiology1960.40.145
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
宏司 篠田
中科院分区：
文献类型：
--
作者：
嘉則 新井;光二 橋本;一男 岩井;宏司 篠田
自1997年以来，被称为Ortho-CT的有限锥束CT已用于临床检查。在此基础上，我们研制了一种新型的有限锥束CT，称为“3DX多图像显微CT”（3DX）。本研究的目的是介绍这种新型的有限锥束X-CT通过比较它的原型（Ortho-CT）。材料和方法3DX与Ortho-CT的基本效率进行了比较。在Rando体模上使用X射线测量3DX和Ortho-CT的皮肤剂量。用调制传递函数（MTF）对两种系统的分辨率进行了评价。对内耳、颞下颌关节（TMJ）、上颌第一磨牙、下颌第一磨牙的解剖标志进行主观图像质量评价。由5名牙科放射科医师和2名耳鼻喉科医师对同一观察点的3DX图像质量进行评价，并与Ortho-CT图像进行比较。五点量表范围从一点（下）到五（上级）。结果皮肤剂量为1.07 mSv与3DX和1.19 mSv与Ortho-CT。“3DX”的皮肤剂量与Ortho-CT几乎相同。Ortho-CT的分辨率为0.6线对/mm（水平）和0.9线对/mm（垂直）的MTF（0.5）。3DX的分辨率为1.1线对/mm（水平）和1.3线对/mm（垂直）。3DX在各观察点的主观图像质量均优于Ortho-CT。最低分为3.46，最高分为4.17。结论在总结Ortho-CT临床应用经验的基础上，我们研制了一种新型的有限锥束X-CT，即“3DX”锥束X-CT。皮肤剂量几乎与原型系统相同。与原型系统相比，图像显示出非常高的分辨率。我们认为，该系统是非常有用的诊断硬组织的牙科和耳科的目的。
The limited cone-beam CT known as Ortho-CT has been used in clinical examination since 1997. On the basis of this experience, we developed a new style of limited cone-beam CT for practical use, called “3DX Multi image micro CT”(3DX). The purpose of this study was to introduce this new style of limited cone-beam X-CT by comparing it to the prototype (Ortho-CT).Material and Methods3DX was compared with Ortho-CT regarding the fundamental efficiency. The skin doses of 3DX and Ortho-CT were measured using TLD on a Rando phantom. The resolutions of both systems were evaluated with MTF (modulation transfer function). The subjective image quality was evaluated on the following anatomical landmarks: the inner ear, temporomandibular joint (TMJ), maxillary first molar, mandibular first molar. Five dental radiologists and two otolaryngologists evaluated the quality of 3DX images comparing then with that of Ortho-CT images for the same observation point. The five-point scale ranged from one point (inferior) to five (superior).ResultsThe skin doses were 1.07 mSv with 3DX and 1.19 mSv with Ortho-CT. The skin dose of “3DX” was almost the same as that of Ortho-CT. The resolutions of Ortho-CT were 0.6 line pair/mm (horizontal) and 0.9 line pair/mm (vertical) on the MTF (0.5). The resolution of 3DX was 1.1 line pair/mm (horizontal) and 1.3 line pair/mm (vertical). The subjective image quality of 3DX was better than that of Ortho-CT at every observation point. The minimum score was 3.46, and maximum score was 4.17. There were significant differences with every observation point (p< 0.05).ConclusionOn the basis of the clinical experience of Ortho-CT, a new style of limited cone-beam X-CT called “3DX” was developed by us for practical use. The skin dose is almost the same as in the prototype system. The images show very high resolution compared to those of the prototype system. We think that this system is very useful for diagnosis of hard tissue for dental purposes and otology.
影响因子：
2.6
作者：
HOUNDFIELD, GN
通讯作者：
HOUNDFIELD, GN