High frequency ultrasonic scattering by biological tissues

2002 ◽  
Vol 111 (5) ◽  
pp. 2463
Author(s):  
K. Kirk Shung ◽  
Subha Maruvada
Keyword(s):  
High Frequency ◽  
Biological Tissues ◽  
Ultrasonic Scattering

scholarly journals A THREE-PHASE INDUCTIVE SENSOR FOR IN VIVO MEASUREMENT OF ELECTRICAL ANISOTROPY OF BIOLOGICAL TISSUES

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Yukio Kosugi ◽  
Tadashi Takemae ◽  
Hiroki Takeshima ◽  
Atsushi Kudo ◽  
Kazuyuki Kojima ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electrical Conductivity ◽  
High Frequency ◽  
Reference Signal ◽  
Biological Tissues ◽  
Electrical Anisotropy ◽  
Conductivity Anisotropy ◽  
In Vivo Measurement ◽  
Surgical Operations

Biological tissue will have anisotropy in electrical conductivity, due to the orientation of muscular fibers or neural axons as well as the distribution of large size blood vessels. Thus, the in vivo measurement of electrical conductivity anisotropy can be used to detect deep-seated vessels in large organs such as the liver during surgeries. For diagnostic applications, decrease of anisotropy may indicate the existence of cancer in anisotropic tissues such as the white matter of the brain or the mammary gland in the breast. In this paper, we will introduce a new tri-phase induction method to drive rotating high-frequency electrical current in the tissue for the measurement of electrical conductivity anisotropy. In the measurement, three electromagnets are symmetrically placed on the tissue surface and driven by high-frequency alternative currents of 0 kHz, modulated with 1 kHz 3-phase signals. In the center area of three magnets, magnetic fields are superimposed to produce a rotating induction current. This current produces electrical potentials among circularly arranged electrodes to be used to find the conductivity in each direction determined by the electrode pairs. To find the horizontal and vertical signal components, the measured potentials are amplified by a 2ch lock-in amplifier phase-locked with the 1 kHz reference signal. The superimposed current in the tissue was typically 45 micro Amperes when we applied 150 micro Tesla of magnetic field. We showed the validity of our method by conducting in vitro measurements with respect to artificially formed anisotropic materials and preliminary in vivo measurements on the pig’s liver. Compared to diffusion tensor MRI method, our anisotropy sensor is compact and advantageous for use during surgical operations because our method does not require strong magnetic field that may disturb ongoing surgical operations.

Study of molecular and nanostructural dynamics of biological tissues under the influence of high-frequency electrosurgical welding

2013 ◽  
Vol 77 (2) ◽  
pp. 146-150 ◽  
Author(s):  
A. A. Vazina ◽  
A. A. Vasilieva ◽  
N. F. Lanina ◽  
A. V. Zabelin ◽  
V. N. Korneev ◽  
...  
Keyword(s):  
High Frequency ◽  
Biological Tissues

New algorithms of high-frequency welding of biological tissues

2021 ◽  
Vol 2021 (2) ◽  
pp. 17-21
Author(s):  
G.S. Marynsky ◽  
◽  
K.G. Lopatkina ◽  
O.V. Chernets ◽  
S.E. Podpryatov ◽  
...  
Keyword(s):  
High Frequency ◽  
Biological Tissues ◽  
New Algorithms

scholarly journals INFLUENCE OF HIGH-FREQUENCY ELECTRIC SCALPEL ON MORPHOLOGICAL INDICATORS OF EXPERIMENTAL ANIMALS BIOLOGICAL TISSUES

2021 ◽  
Vol 2 (1) ◽  
pp. 193
Author(s):  
S. M. Bilash ◽  
O. M. Pronina ◽  
A. V. Pyrog-Zakaznykova ◽  
R. O. Reva ◽  
O. S. Svyryda ◽  
...  
Keyword(s):  
High Frequency ◽  
Biological Tissues ◽  
Experimental Animals ◽  
Electric Scalpel

scholarly journals Bench research of high-frequency electric welding of biological tissues

2016 ◽  
Vol 2016 (12) ◽  
pp. 38-42 ◽  
Author(s):  
G.S. Marinsky ◽  
◽  
A.V. Chernets ◽  
V.A. Tkachenko ◽  
D.A. Grabovsky ◽  
...  
Keyword(s):  
High Frequency ◽  
Biological Tissues ◽  
Electric Welding
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