IMAGING SOFT TISSUE THROUGH BONE WITH ULTRASOUND TRANSMISSION TOMOGRAPHY BY RECONSTRUCTION
IMAGING SOFT TISSUE THROUGH BONE WITH ULTRASOUND TRANSMISSION TOMOGRAPHY BY RECONSTRUCTION
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DOI：
10.1118/1.594318
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发表时间：
1977-01-01
期刊：
影响因子：
--
通讯作者：
AHUJA A S
中科院分区：
文献类型：
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作者：
CARSON P L;OUGHTON T V;AHUJA A S
由直径为2.5 cm的铝棒、填充有蓖麻油的球囊和填充有苯基硅油的球囊组成的体模在水中通过超声透射断层扫描重建（UTTR）成像。选择该体模用于研究检测含骨平面中软组织超声速度和超声衰减系数微小变化的可行性。也获得了羔羊腿的横截面的衰减图像。相对的发射和接收换能器在成像对象的任一侧上进行扫描，就像在第一X射线计算机化轴向断层摄影系统中采用的笔形束几何形状中扫描X射线管和检测器一样。通过铝棒和骨传输了足够的信号以获得重建;但是，在这些粗糙的图像中，存在许多伪影，这些伪影使这种有前途的技术的未来效用保持不确定性。虽然速度成像不应该像衰减成像那样对反射和折射敏感，但是必须采用非常窄的超声束以在速度成像中获得合理的分辨率。
A phantom consisting of a 2.5-cm-diameter aluminum rod, a balloon filled with castor oil, and a balloon filled with a phenylated silicone fluid was imaged in water with ultrasound transmission tomography by reconstruction (UTTR). This phantom was chosen for investigation of the feasibility of detecting small changes in the ultrasound velocity and ultrasound attenuation coefficient of soft tissues in planes containing bones. Attenuation images of a transverse section of a leg of lamb were obtained as well. Opposed transmitting and receiving transducers were scanned on either side of the imaged object, just as an x-ray tube and detector are scanned in the pencil beam geometry employed wtih the 1st x-ray computerized axial tomographic system. More than adequate signal was transmitted through the aluminum rod and the bone to obtain reconstructions; but, in these crude images, there were numerous artifacts which maintain the uncertainty regarding the future utility of this promising technique. Although velocity imaging should not be as sensitive to reflection and refraction as attenuation imaging, a very narrow ultrasound beam must be employed to obtain reasonable resolution in velocity imaging.