Title :
Time of flight ultrasonic CT based on ML-EM for wooden pillars
Author :
Fan, Honghui ; Guo, Shuqing ; Tamura, Yasutaka ; Yanagida, Hirotaka ; Takahashi, Tatsuhisa ; Adachi, Kazunari
Author_Institution :
Grad. Sch. of Sci. & Eng., Yamagata Univ., Yonezawa
Abstract :
The ML-EM method was applied to ultrasonic TOF CT. The numerical phantom and the wood phantom were prepared. In the experiments, the number of obtained TOF data is 306. Considering the measurement time and phantom size, it often becomes an upper bound in our ultrasonic system. When the image was reconstructed by only 306 data, the image had many artifacts. To obtain clear image, the interpolation was used. After interpolation, the defect was clearly recognized by CT image.
Keywords :
acoustic signal processing; acoustic tomography; expectation-maximisation algorithm; ultrasonic imaging; wood; maximum likelihood-expectation maximisation algorithm; numerical phantom; time of flight ultrasonic CT; ultrasonic TOF CT; wood phantom; wooden pillars; Aerospace engineering; Biomedical engineering; Computed tomography; Image reconstruction; Imaging phantoms; Interpolation; Medical services; Ultrasonic imaging; Ultrasonic variables measurement; Upper bound; Maximum Likelihood - Expectation Maximization; time-of-flight; ultrasonic computed-tomography;
Conference_Titel :
Ultrasonics Symposium, 2008. IUS 2008. IEEE
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2428-3
Electronic_ISBN :
978-1-4244-2480-1
DOI :
10.1109/ULTSYM.2008.0364
