山越-篠塚 共同研究プロジェクトのご紹介
Development of fetal movements measurement system
using pulsed Doppler with minute tissue displacement measurement
New Method of Fetal Breathing Movements Tracking using Real-time Pulsed Doppler
Ultrasound Displacement Measurement
Norio Shinozuka, Yoshiki Yamakoshi, Yuji Taketani
Journal of Ultrsound in Medicine 13(1):19-25,1994
abstract
To develop a clinical device for monitoring FBM with a simplified mechanism, the
multi-channel pulsed Doppler device was achieved by modifying the ultrasonographic
module and probe of a cardiotocograph. A new algorithm of signal processing with
a high accuracy displacement estimation technique produced real-time and continuous
displacement calculations. In vivo measurements demonstrated that real-time output
produced commendable quality in FBM tracking. The displacement of a few hundred micrometers
becaouse of FBM was measured successfully. The results suggest that quantitative
assessments of FBM should be possible with this technique.
Keywords displacement estimation, fetal breathing movements,
fetal behavior, fetal monitoring, pulsed Doppler ultrasonography
Realtime FBM tracking 1
QuickTime movie (2.4M) or MPEG movie(368k)
Realtime FBM tracking 2
QuickTime movie (2.4M) or MPEG movie(752k)
Development of three dimensional ultrasonograpy
for transvaginal ultrasound
Transvaginal Sonographic Orientation Detection System using Ceramic Gyroscopes
Norio Shinozuka, Yasunori Oie, Yoshiki Yamakoshi, Yuji Taketani
Journal of Ultrsound in Medicine 15(2):107-113,1996
abstract
Use of three-dimesional ultrasonograms in daily clinical medicine requires the development
of data accumulation technique and image reconstruction techniques. We desctibe an
image position and orientation detection technique using small piezoelectric vibratory
gyroscopes. Such gyroscopes, of the same type that is used in an automobile navigation
system, produce anguler velocity by Coriolis force. After attaching three gyroscopes
to an ordinal transvaginal probe, we attempted to detect image orientation to assist
transvaginal scanning and to reconstruct three-dimesional projection images. Three-dimesional
images were reconstructed by simple white and black inversion thresholding technique.
Using free hand transvaginal scanning, the direction of transvaginal ultrasound beam
was displayed with B mode ultrasonography. Using a personal computer, three-dimesional
image of follicles and fetuses were successfully reconstructed within a few minuets.
Our system provides easy understanding of transvaginal ultrasonographic images and
potentially might allow ordinal ultrasound machines to handle three-dimesional images
in a day to day clinical practice.
Keywords Three dimensional ultrasonography; Transvaginal ultrasonography;
Orientation, image; Reconstruction, image; Gyroscope
Example of transvaginal ultrasonography using orientation detection
system.
QuickTime movie (2.6M) or
MPEG movie(233k)
Example of 3D ultrasonographic image of fetus at 8 weeks
QuickTime movie (1.4M) or
MPEG movie(357k)
Bibliography of joint works
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