A Fundamental Evaluation of In Vivo Local Sound Speed Measurement by Crossed Beam Method (2nd report)

1987 ◽  
Vol 26 (S1) ◽  
pp. 58
Author(s):  
Masafumi Kondo ◽  
Kinya Takamizawa
Keyword(s):  
Sound Speed ◽  
Speed Measurement ◽  
Beam Method ◽  
Local Sound

An evaluation of an in vivo local sound speed estimation technique by the crossed beam method

1990 ◽  
Vol 16 (1) ◽  
pp. 65-72 ◽  
Author(s):  
Masafumi Kondo ◽  
Kinya Takamizawa ◽  
Makoto Hirama ◽  
Kiyoshi Okazaki ◽  
Kazuhiro Iinuma ◽  
...  
Keyword(s):  
Sound Speed ◽  
Speed Estimation ◽  
Estimation Technique ◽  
Beam Method ◽  
Local Sound

Clinical Sound Speed Measurement in Liver and Spleen in Vivo

1987 ◽  
Vol 9 (4) ◽  
pp. 221-235 ◽  
Author(s):  
C.F. Chen ◽  
D.E. Robinson ◽  
L.S. Wilson ◽  
K.A. Griffiths ◽  
A. Manoharan ◽  
...  
Keyword(s):  
Sound Speed ◽  
Disease Status ◽  
Clinical Results ◽  
General Purpose ◽  
Clinical Role ◽  
Speed Measurement ◽  
Clinical Confidence ◽  
Signal Processing Methods

The paper describes an implementation of clinical sound speed measurement using either a commercial water path scanner or a specially developed dual transducer real time scanner, each interfaced to a general purpose minicomputer for off-line analysis. It describes the examination technique to obtain suitable in vivo clinical data from the liver and the spleen. It develops signal processing methods to achieve clinical confidence in individual measurements. Forty-five liver patients and 46 spleen patients were examined. Sound speed was found to correlate closely with fibrosis content in both the liver and the spleen with an increase in fibrosis resulting in a decrease in sound speed. Sound speed in various pathological conditions are discussed. Clinical results of sequential examinations on patients under treatment are presented and successful monitoring of the disease status is demonstrated. The potential clinical role of sound speed measurement is suggested.

A Fundamental Evaluation of in Vivo Sound Speed Mapping Technique by Crossed Beam Method

1989 ◽  
pp. 491-498
Author(s):  
Masafumi Kondo ◽  
Kinya Takamizawa ◽  
Makoto Hirama ◽  
Kiyoshi Okazaki ◽  
Kazuhiro Iinuma ◽  
...  
Keyword(s):  
Sound Speed ◽  
Mapping Technique ◽  
Beam Method

scholarly journals Ultrasonic fat fraction quantification using in vivo adaptive sound speed estimation

2018 ◽  
Vol 63 (21) ◽  
pp. 215013 ◽  
Author(s):  
Marion Imbault ◽  
Marco Dioguardi Burgio ◽  
Alex Faccinetto ◽  
Maxime Ronot ◽  
Hanna Bendjador ◽  
...  
Keyword(s):  
Sound Speed ◽  
Speed Estimation ◽  
Fat Fraction

scholarly journals Temporal and Spatial Fluctuations in Widths of solar Euv Lines

1980 ◽  
Vol 51 ◽  
pp. 53-53
Author(s):  
R.G. Athay ◽  
O.R. White
Keyword(s):  
Line Width ◽  
Sound Speed ◽  
Large Scale ◽  
Small Cells ◽  
The Sun ◽  
Doppler Shifts ◽  
Spatial Fluctuations ◽  
Local Sound ◽  
Line Widths ◽  
Temporal And Spatial

AbstractAnalyses of some 300 hours of time sequences of solar EUV line profiles obtained with 0S0-8 show large fluctuations in line widths. At a given location on the sun, line widths fluctuate temporally on time scales ranging from less than a minute to over an hour. At any given time, line widths fluctuate spatially on a variety of scales ranging from active region size to arc second size. Temporal and spatial fluctuations are of approximately the same amplitude. Thus, the sun can be characterized by an aggregate of small cells in each of which line widths are fluctuating in time and which have random phases with respect to each other.Spatial fluctuations in line width are correlated with large scale spatial fluctuations in brightness for some lines but not for others. Temporal fluctuations in width are sometimes correlated with either Doppler shifts or intensity fluctuations, but more often such correlations are absent.For a given line, the line width varies through an extreme range of about a factor of two. Nonthermal components of line width vary from approximately the local sound speed to a small fraction of the sound speed.

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