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Application of holographic interferometry measuring technique to deformation measurement of bone due to thermal stress
IMTC/2002. Proceedings of the 19th IEEE Instrumentation and Measurement Technology Conference (IEEE Cat. No.00CH37276)
Year: 2002 | Conference Paper |
Cited by: Papers (2)
The holographic interferometry measuring system (HIMS) was applied to the deformation measurement of the bone which is deformed due to thermal stress. A thermo-graphic measuring system (TGMS) was also applied to show a correlation between the holographic deformation pattern and thermal pattern on the bone surface. From the experimental results, the same thermal pattern was observed for different e...Show More
C-mode imaging of reflection ratio on curved surface of bone
1998 IEEE Ultrasonics Symposium. Proceedings (Cat. No. 98CH36102)
Year: 1998 | Conference Paper |
An ultrasonic-based method has been proposed for measuring the spatial distribution of reflection ratio on the curved surface of a bone object. This method, employing a two dimensional transducer array, is based on the time reversible symmetry of wave propagation. A scattering matrix is defined for each scatter object from each combination of two transducers in the transducer array. By solving the...Show More
Regional myocardial layer function in Doxorubicin cardiomyopathy; clinical evaluation using novel ultrasonic Doppler method
Y. Koiwa;H. Kamada;H. Kanai;K. Sugimura;F. Tezuka;Y. Saitoh;H. Honda;K. Shirato;N. Chubachi
1998 IEEE Ultrasonics Symposium. Proceedings (Cat. No. 98CH36102)
Year: 1998 | Conference Paper |
Cited by: Papers (1)
We examined whether the novel Doppler technique could be a sensitive diagnostic method for the histological deterioration of Doxorubicin cardiomyopathy (DoxCM). 25 patients with acute lymphoblastic leukaemia were examined for six years. Moreover, in Doxorubicin injected rabbits, histological damage was compared to the myocardial layer function by the Doppler technique. In normal subjects, myocardi...Show More
Noninvasive evaluation of bone stiffness by combining microdefocusing method and reflectance method
1998 IEEE Ultrasonics Symposium. Proceedings (Cat. No. 98CH36102)
Year: 1998 | Conference Paper |
Cited by: Patents (1)
Acoustic and elastic properties of bone obtained by ultrasonic-based methods are highly useful in the direct evaluation of bone characteristics. Thus, many methods and systems, which are based on the measurement of velocity and/or attenuation of bone, have been developed. On the other hand, bone stiffness has been considered as an effective index for diagnosis of bone disease such as osteoporosis....Show More
Realtime velocimetry for evaluation of change in thickness of myocardium and arterial wall
1998 IEEE Ultrasonics Symposium. Proceedings (Cat. No. 98CH36102)
Year: 1998 | Conference Paper |
Cited by: Patents (3)
The authors have already developed a new method for accurately tracking the movement of the heart wall and arterial wall based on both the phase and magnitude of the demodulated signals to determine the instantaneous position of an object. By pipelining and parallel processing using four high-speed digital signal processing (DSP) chips, the above developed method is realized in real time. By this ...Show More
Measurement of local elasticity of human carotid arterial walls and its relationship with risk index of atherosclerosis
1998 IEEE Ultrasonics Symposium. Proceedings (Cat. No. 98CH36102)
Year: 1998 | Conference Paper |
We have proposed a new method for evaluating the local elasticity of the arterial wall in order to diagnose the early stage atherosclerosis. In the case of the early stage atherosclerosis, the macular lesion is several millimeters in diameter. Therefore, it, is necessary to find the local change in the elasticity of the arterial wall. In the proposed method, the small change in thickness of the ar...Show More
Imaging spatial distribution of high-frequency small vibrations on the heart wall
1998 IEEE Ultrasonics Symposium. Proceedings (Cat. No. 98CH36102)
Year: 1998 | Conference Paper |
Cited by: Patents (1)
We have developed a novel method for accurately measuring the velocity signals on the multiple points preset on an ultrasonic beam in the heart wall by tracking the movement of the heart wall. By applying the time-frequency analysis to the resultant velocity signals of the heart wall, we have determined the instantaneous eigenfrequency of the left ventricle (LV) at the end-diastole. From the eigen...Show More
Time dependent autoregressive spectrum estimation of heart wall vibrations
1997 IEEE International Conference on Acoustics, Speech, and Signal Processing
Year: 1997 | Conference Paper |
We present a new method for estimation of spectrum transition of a nonstationary signals in low signal-to-noise ratio cases. Instead of basic functions which are employed by the previously proposed time-varying AR modeling, we introduce the spectrum transition constraint in the cost function described by the partial correlation coefficients so that the method is applicable to noisy nonstationary s...Show More
Evaluation of elastic property of the arterial wall by measuring small velocity signals using ultrasound
H. Hasegawa;M. Ozawa;H. Kanai;N. Hoshimiya;N. Chubachi;Y. Koiwa
1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)
Year: 1997 | Conference Paper |
Cited by: Papers (2)
To evaluate the elasticity of the arterial wall more locally, it is necessary to noninvasively measure the local change in thickness of the arterial wall with amplitude of several micrometers. For this purpose, in this paper, small velocity signals on the arterial wall is accurately measured using ultrasound. From this small change in thickness, the systolic blood pressure, and the diastolic blood...Show More
Noninvasive evaluation of local myocardial thickening and its color-coded imaging
For the noninvasive diagnosis of heart disease based on the acoustic characteristics of the heart muscle, we have developed a new method for accurately tracking the movement of the heart wall. By this method, a velocity signal of the heart wall with a small amplitude of less than 10 /spl mu/m on the motion resulting from a heartbeat with large amplitude of 10 mm can be successfully detected with s...Show More
Noninvasive evaluation of spatial distribution of thickness change in myocardium
1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)
Year: 1997 | Conference Paper |
For the noninvasive diagnosis of heart disease based on movability of the myocardium in the heart wall, the authors have already developed a new method. By the method, velocity signals of the heart wall with small amplitudes less than 10 micrometer on the motion resulting from a heartbeat with large amplitude of 10 mm can be successfully detected with sufficient reproducibility in the frequency ra...Show More
Quantitative characterization of proton-exchanged layers in LiTaO3 optoelectronic devices by line-focus-beam acoustic microscopy
IEEE Photonics Technology Letters
Cited by: Papers (20)
Application of line-focus-beam (LFB) acoustic microscopy is extended to quantitative characterization of proton-exchanged/annealed layers employed in LiTaO/sub 3/ optical waveguides. Several specimens of Z-cut LiTaO/sub 3/ substrates, processed under the fabrication conditions for second-harmonic generation (SHG) optoelectronic devices, were prepared for measurements of the leaky surface acoustic ...Show More
Nerve excitation model for localized magnetic stimulation of finite neuronal structures
A. Hyodo;S. Ueno;S. Yamada;M. Kawasaki;Y. Gunji;P. Ronan;S. Harada;H. Yamamoto;H. Matsuki;Y. Yamakata;N. Chubachi;S. Nitta;H. Hashimoto
IEEE Transactions on Magnetics
Cited by: Papers (16)
We focus on a membrane excitation model of finite and bent nerves elicited by magnetically induced electric fields. We simulated nerve excitation by changing the length of an axon and the distance between the coil and the nerve. The computer simulation suggests that the termination points of nerves or the bending part of an axon are low threshold stimulation sites when magnetically stimulated with...Show More
Transcutaneous DC-DC converter for totally implantable artificial heart using synchronous rectifier
IEEE Transactions on Magnetics
Cited by: Papers (25)
To drive a totally implantable artificial heart for a long period with transcutaneous energy transmission, it is necessary that the temperature rise of devices implanted inside the human body is minimized. In this paper we study the properties of a transcutaneous DC-DC converter which transfers energy from an external source to a vibrating flow pump within the body, The temperature rise of the int...Show More
Signal transmission for implantable medical devices using figure-of-eight coils
A new skin-transparent signal transmission method is proposed. For applications on high energy-consumption medical devices such as total artificial hearts or implantable FES (functional electrical stimulation) systems, we constructed a transcutaneous signal transmission system using figure-of-eight coils, as it is apparent that these applications need feedback and/or controlling signals for stable...Show More
Transcutaneous measurement and spectrum analysis of heart wall vibrations
For the noninvasive diagnosis of heart disease based on the acoustic and elastic characteristics of the heart muscle, it is necessary to transcutaneously measure small vibration signals, including components with an amplitude of less than 100 /spl mu/m, from various parts of the heart wall continuously for periods of more than several heartbeats in a wide frequency range up to 1 kHz. Such measurem...Show More
Evaluation of spatial resolution of spherical-planar-pair lenses for elasticity measurement with microscopic resolution
The spatial resolution of spherical-planar-pair (SPP) lenses used in an ultrasonic microspectrometer (UMSM) was evaluated by scanning the lenses over a sharp edge of a specimen. The variation of the output observed in experiments was in good agreement with the theory. In the direction perpendicular to the propagation of a leaky surface acoustic wave (SAW), the best spatial resolution was obtained....Show More
Energy transferring system reducing temperature rise for implantable power consuming devices
H. Matsuki;Y. Yamakata;N. Jinguji;S. Nitta;N. Hoshimiya;N. Chubachi
Proceedings of 18th Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Year: 1996 | Conference Paper |
We investigated the energy transferring system whose temperature rise was reduced below 2 degrees in case of energy transmission of 20 watts. The system was developed for energy consuming implantable devices, such as totally artificial heart (TAH) or multichannel functional electrical stimulation (FES). Electrical energy was transferred inductively through transcutaneous transformer made of amorph...Show More
Quantitative evaluation of bending components in propagation of small vibrations on vessel wall
Proceedings of 18th Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Year: 1996 | Conference Paper |
The authors have proposed a new method for diagnosis of early stage of arteriosclerosis by measuring small vibrations on arterial wall. In their previous study, they found that propagation velocity of the small vibrations on vessel wall strongly depends on Young's modulus in axial direction of the medium. Here, a new function is introduced to quantitatively evaluate the frequency band in which ben...Show More
Noninvasive measurement of velocity of small vibration on aorta induced by impulsive actuator
Proceedings of 17th International Conference of the Engineering in Medicine and Biology Society
Year: 1995 | Conference Paper |
Cited by: Papers (1)
It is important for early diagnosis of arteriosclerosis to noninvasively measure the local elasticity of the artery. To improve the spatial resolution in the local velocity measurement of vibration propagating on the arterial wall, this paper proposes a new method to actuate an impulsive wave with higher frequency components up to 1 kHz from the backbone and transcutaneously measure the transit de...Show More
Double PWM method for high voltage discharge energy control [wire bonding]
Proceedings of 1995 Japan International Electronic Manufacturing Technology Symposium
Year: 1995 | Conference Paper |
High voltage discharge technology is important in the process of semiconductor manufacture, especially in the electric torch wire bonding system. For the wire bonding technology, a precise diameter of balls is required to form on the end of Au wire by a high voltage discharge arc. This paper describes a double PWM method developed to control the high voltage discharge energy in connection with the...Show More
Characterization of 36/spl deg/YX-LiTaO/sub 3/ wafers by line-focus-beam acoustic microscopy
J. Kushibiki;H. Ishiji;T. Kobayashi;N. Chubachi;I. Sahashi;T. Sasamata
Application of line-focus-beam (LFB) acoustic microscopy is extended to characterization of substrates for SH-type SAW devices. Theoretical and experimental studies on a wave mode for characterization are carried out on 36/spl deg/Y-cut LiTaO/sub 3/ wafers. A Rayleigh-type mode of leaky surface acoustic waves (LSAWs) must be employed instead of an SH-type mode of leaky pseudo-surface waves (LPSAWs...Show More
A time-varying AR modeling of heart wall vibration
1995 International Conference on Acoustics, Speech, and Signal Processing
Year: 1995 | Conference Paper |
Cited by: Papers (2)
We present a new method that can be used to estimate the spectrum transition of nonstationary signals in low signal-to-noise ratio (SNR) cases. If the spectrum transition pattern is complex and/or there are large differences in the transition patterns among the individual nonstationary signals, it is difficult to estimate the transition pattern stably by the previously proposed time-varying AR mod...
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First Page of the Article
Show MoreVHF/UHF range bioultrasonic spectroscopy system and method
A new system and method for characterizing biological tissues in vitro and liquids in the VHF and UHF ranges is described. Bulk acoustic properties such as the sound velocity, attenuation, acoustic impedance, and density are determined in reflection and transmission modes, with the biological tissue/liquid specimen sandwiched between the parallel surfaces of synthetic silica glass buffer rods havi...Show More
This paper presents a new method to measure local pulse wave velocity (PWV), which is an index of the hardness in the range of several millimeters on the aortic wall for diagnosis of the early stage arteriosclerosis. Small vibration signals are measured simultaneously at two adjacent points on the aortic wall near the aortic valve by electronically alternating the direction of an ultrasonic beam. ...Show More
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