A Development of a high sensitivity cephalometric radiography using a photon-counting X-ray sensor.

使用光子计数 X 射线传感器开发高灵敏度头影测量射线照相术。

• 批准号: 07672044
• 负责人: TOKUOKA Osamu
• 金额: $ 1.41万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07672044/
• 关键词: Digital Radiography; Cephalometric Radiography; Cd; Te Sensor; デジタルラジオグラフィー; 量子計数型X線センサ; X線画像ワークステーション; 量子計数型X線センサー; CdTe素子; セファログラム; 骨塩定量; スキャノグラフィー; ワンショットデュアルエネルギーサブトラクション

Cd/Te X-ray sensor was used as a super high sensitive X-ray detector for the development of cephalometric radiography. A Cd/Te crystal, a high speed pulse amplifier, acomparator and a 16bit counter were basic components of a X-ray detector. First, a Cd/Te crystal catches a X-ray photon and makes a electric pulse signal wich voltage is in proportion to the X-ray photon energy. Second, a high speed pulse amplifier amplifies that electrical pulse. Third, noise component of electrical signal is cutting off by comparator. Forth, pulse of purified electrical signal is counted by the comparator. In this way, a pixel values are measured. 2 dimensional sensor which size was about 2x130 mm was made. This sensor was equipped on the specially made dental panoramic X-ray machine AZ3000^<TM>. This machine could perform scanography, then the cephalometric radiography was taken as a scanned radiography technique. This system was almost 20 times high sensitive compared with a conventional screen-film system.To watch a cephalometric images, X-ray image viewing station was made. This viewing system was based on DICOM3.0 standard and had a Hyper Text base user interface.

采用Cd/Te X射线传感器作为超高灵敏度X射线探测器，研制了X线头影测量系统。Cd/Te晶体、高速脉冲放大器、比较器和16位计数器是X射线探测器的基本组成部分。首先，Cd/Te晶体捕获X射线光子，产生与X射线光子能量成正比的电脉冲信号。第二，高速脉冲放大器放大电脉冲。第三，通过比较器将电信号中的噪声成分滤除。第四步，比较器对净化后的电信号进行脉冲计数。以这种方式，测量像素值。制作了尺寸约为2 × 130 mm的二维传感器。该传感器安装在特制的牙科全景X光机AZ 3000 ^上<TM>。本机可进行扫描摄影，然后将X线头影测量作为一种扫描摄影技术。该系统的灵敏度比传统的屏片系统高近20倍。该观察系统基于DICOM3.0标准，并具有基于超文本的用户界面。