Ultrasonic reflection mode computed tomography through a skullbone
Ultrasonic reflection mode computed tomography through a skullbone
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通过颅骨的超声反射模式计算机断层扫描
DOI：
10.1109/10.61031
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发表时间：
1990
影响因子：
4.6
通讯作者：
J. Oksman
中科院分区：
文献类型：
--
作者：
J. Ylitalo;J. Koivukangas;J. Oksman
超声反射模式CT（计算机断层扫描）方法被应用于经颅成像的大脑。该方法仅涉及单个换能器和单次扫描以从对象获取数据。在重建中，应用普通的傅立叶切片定理。由于颅骨的超声平均速度的变化可以得到补偿。在实验中，浸没在水中的物体被广角传感器通过360度视角扫描。当通过骨成像时，使用简化的方法，其中一块颅骨（厚度3-4 mm）牢固地附接到换能器。为了进行比较，同一物体在没有头骨的情况下成像。使用1 MHz超声进行经颅成像时，两点分辨率优于3 mm。脑标本的实验表明，经颅图像与无骨干扰的相同标本的图像进行了比较。本研究结果对于小儿脑部疾病的诊断及术后追踪具有重要的临床意义。基于该方法，目前正在开发一种专门用于儿童脑部疾病诊断的临床原型成像仪。<<ETX>>
An ultrasonic reflection-mode CT (computed tomography) method was applied to transskull imaging of the brain. The method involves only a single transducer and a single scan to acquire data from the object. In reconstruction an ordinary Fourier slice theorem is applied. The average velocity changes of ultrasound due to the skullbone can be compensated. In experiments the object immersed in water was scanned by a wide-angle transducer through the viewing angle of 360 degrees . When imaging through bone a simplified approach was used, in which a piece of skullbone (thickness 3-4 mm) was attached firmly to the transducer. For comparison, the same object was then imaged without the skullbone. A two-point resolution better than 3 mm was achieved for transskull imaging using 1 MHz ultrasound. The experiments with brain specimens show that transskull images compare well with the images of the same specimens obtained without the bone interference. The findings are clinically significant in terms of pediatric brain diagnosis and postoperative follow up. Based on the method, a clinical prototype imager is currently being developed especially for diagnosis of children's brain diseases.<<ETX>>