OP22.01: Fractional moving blood volume for standardising three dimensional power Doppler quantification: importance of pulse repetition frequency

2015 ◽  
Vol 46 ◽  
pp. 119-119
Author(s):  
C.A. Soares ◽  
A.H. Miyague ◽  
T.Z. Pavan ◽  
W.P. Martins
Keyword(s):  
Blood Volume ◽  
Pulse Repetition Frequency ◽  
Power Doppler ◽  
Three Dimensional ◽  
Repetition Frequency ◽  
Pulse Repetition

Importance of Pulse Repetition Frequency Adjustment for 3- and 4-Dimensional Power Doppler Quantification

2015 ◽  
Vol 34 (12) ◽  
pp. 2245-2251 ◽  
Author(s):  
Andre H. Miyague ◽  
Theo Z. Pavan ◽  
Carlos A. Soares ◽  
Luc De Catte ◽  
Carolina O. Nastri ◽  
...  
Keyword(s):  
Pulse Repetition Frequency ◽  
Power Doppler ◽  
Repetition Frequency ◽  
Pulse Repetition ◽  
Frequency Adjustment

Understanding the Influence of Flow Velocity, Wall Motion Filter, Pulse Repetition Frequency, and Aliasing on Power Doppler Image Quantification

2017 ◽  
Vol 37 (1) ◽  
pp. 255-261 ◽  
Author(s):  
Maricy R. Martins ◽  
Wellington P. Martins ◽  
Carlos A. M. Soares ◽  
Andre H. Miyague ◽  
Marek J. Kudla ◽  
...  
Keyword(s):  
Flow Velocity ◽  
Wall Motion ◽  
Pulse Repetition Frequency ◽  
Power Doppler ◽  
Repetition Frequency ◽  
Pulse Repetition ◽  
Image Quantification ◽  
Doppler Image

Influence of Pulse Repetition Frequency on 3-D Power Doppler Quantification

2016 ◽  
Vol 42 (12) ◽  
pp. 2887-2892 ◽  
Author(s):  
Carlos A.M. Soares ◽  
Theo Z. Pavan ◽  
Andre H. Miyague ◽  
Marek Kudla ◽  
Wellington P. Martins
Keyword(s):  
Pulse Repetition Frequency ◽  
Power Doppler ◽  
Repetition Frequency ◽  
Pulse Repetition

scholarly journals Effects of Non-thermal Ultrasound on a Fibroblast Monolayer Culture: Influence of Pulse Number and Pulse Repetition Frequency

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5040
Author(s):  
Silvia Ronda Peñacoba ◽  
Mar Fernández Gutiérrez ◽  
Julio San Román del Barrio ◽  
Francisco Montero de Espinosa
Keyword(s):  
Short Pulse ◽  
Pulse Repetition Frequency ◽  
Pulse Number ◽  
Repetition Frequency ◽  
Pulse Repetition ◽  
Treatment Protocols ◽  
Culture Plate ◽  
New Treatment ◽  
Long Pulse

Despite the use of therapeutic ultrasound in the treatment of soft tissue pathologies, there remains some controversy regarding its efficacy. In order to develop new treatment protocols, it is a common practice to carry out in vitro studies in cell cultures before conducting animal tests. The lack of reproducibility of the experimental results observed in the literature concerning in vitro experiments motivated us to establish a methodology for characterizing the acoustic field in culture plate wells. In this work, such acoustic fields are fully characterized in a real experimental configuration, with the transducer being placed in contact with the surface of a standard 12-well culture plate. To study the non-thermal effects of ultrasound on fibroblasts, two different treatment protocols are proposed: long pulse (200 cycles) signals, which give rise to a standing wave in the well with the presence of cavitation (ISPTP max = 19.25 W/cm2), and a short pulse (five cycles) of high acoustic pressure, which produces a number of echoes in the cavity (ISPTP = 33.1 W/cm2, with Pmax = 1.01 MPa). The influence of the acoustic intensity, the number of pulses, and the pulse repetition frequency was studied. We further analyzed the correlation of these acoustic parameters with cell viability, population, occupied surface, and cell morphology. Lytic effects when cavitation was present, as well as mechanotransduction reactions, were observed.

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