Development of Measuring Apparatus of Bone Density with Ultrasonic CT

超声CT骨密度测量仪的研制

• 批准号: 09555074
• 负责人: FUJII Motoo
• 金额: $ 6.66万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 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
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555074/
• 关键词: Bone density measurement; Non-invasive method; Ultrasonic CT; Numerical Simulation; Experiment; 数値シュミュレーション

The purpose of the present project is to develop an apparatus for measuring the bone density distribution with ultrasonic CT method. Because the ultrasound wave beam is attenuated and also refracted largely when it passes through the bone, there are many difficult problems to be solved to apply the CT method for bone density measurement. The present study has done according to the following schedule : 1) To estimate the characteristics of the ultrasound wave passed through a similar material like bone. 2) To find out the most effective method of wave signal processing. 3) To establish an effective reconstruction method applicable for the projection of refracted wave beam. 4) To develop an apparatus of practical use. The main results are as follows :1. Through the measurements and numerical simulations for a material with known sound propagation characteristics, the necessary conditions are determined to obtain the data for CT metho d.2. A reconstruction algorithm newly developed is confirmed to be applicable for the case where the sound beam is refracted. The reconstruction method reduces largely the effect of the beam refraction that causes the enlargement of the actual body and reduction of sound velocity as a result.3. In the case of human forefinger, the present CT method can obtain the bone shape and the sound velocity distribution of the bone not different much from the actual value.4. The study will be continued to develop a compact measuring apparatus for practical use.

本项目的目的是开发一种利用超声CT方法测量骨密度分布的装置。由于超声波束在穿过骨骼时会衰减且折射较大，因此应用CT方法进行骨密度测量有许多难题需要解决。本研究是根据以下时间表进行的：1）估计超声波穿过类似骨骼等材料的特性。 2）找出最有效的波浪信号处理方法。 3)建立一种适用于折射波束投影的有效重构方法。 4）开发实用的装置。主要结果如下： 1．通过对已知声传播特性的材料进行测量和数值模拟，确定获得CT方法d.2数据的必要条件。新开发的重建算法被证实适用于声束折射的情况。该重建方法很大程度上减少了光束折射的影响，从而导致实体的放大和声速的降低。 3．以人的食指为例，目前的CT方法可以得到与实际值相差不大的骨骼形状和骨骼的声速分布。4．该研究将继续开发一种实用的紧凑型测量装置。

项目成果

M.Fujii and X.Zhang: "Noncontact Measurement of Internal Temperature Distribution in a Solid Material Using Ultrasonic Computed Tomography" Experimental Heat Transfer, Fluid Mechanics and Thermodynamics 1997. vol.1. 169-176 (1997)

M.Fujii 和 X.Zhang：“使用超声波计算机断层扫描非接触式测量固体材料内部温度分布”实验传热、流体力学和热力学 1997 年。第 1 卷。

Motoo FUJII,Xing ZHANG,Chiori KAKU and Masayuki SAEKI: "Noncontact Measurement of Bone Density Distribution Using Ultrasonic Computed Tomography" The Report of Institute of Advanced Material Study, Kyushu University. Vol.12, No.2. 115-124 (1998)

Motoo FUJII、Xing ZHANG、Chiori KAKU 和 Masayuki SAEKI：“使用超声波计算机断层扫描技术非接触式测量骨密度分布”九州大学先进材料研究所的报告。

藤井丕夫 他3名: "超音波CT法による骨密度分布の測定に関する研究" 九州大学機能物質科学研究報告. 12巻.2号. 115-124 (1998)

藤井八雄等3人：“利用超声波CT法测量骨密度分布的研究”九州大学功能材料科学研究报告第12卷第2期115-124（1998年）。