scholarly journals Main Uncertainties in the RF Ultrasound Scanning Simulation of the Standard Ultrasound Phantoms

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4420
Author(s):  
Monika Makūnaitė ◽  
Rytis Jurkonis ◽  
Arūnas Lukoševičius ◽  
Mindaugas Baranauskas
Keyword(s):  
Quantitative Evaluation ◽  
Phased Array ◽  
Digital Simulation ◽  
3D Models ◽  
Array Transducer ◽  
Rf Signals ◽  
Background Material ◽  
Signal Simulation ◽  
Rf Signal ◽  
Insufficient Knowledge

Ultrasound echoscopy technologies are continuously evolving towards new modalities including quantitative parameter imaging, elastography, 3D scanning, and others. The development and analysis of new methods and algorithms require an adequate digital simulation of radiofrequency (RF) signal transformations. The purpose of this paper is the quantitative evaluation of RF signal simulation uncertainties in resolution and contrast reproduction with the model of a phased array transducer. The method is based on three types of standard physical phantoms. Digital 3D models of those phantoms are composed of point scatterers representing the weak backscattering of the background material and stronger backscattering from inclusions. The simulation results of echoscopy with sector scanning transducer by Field II software are compared with the RF output of the Ultrasonix scanner after scanning standard phantoms with 2.5 MHz phased array. The quantitative comparison of axial, lateral, and elevation resolutions have shown uncertainties from 9 to 22% correspondingly. The echoscopy simulation with two densities of scatterers is compared with contrast phantom imaging on the backscattered RF signals and B-scan reconstructed image, showing that the main sources of uncertainties limiting the echoscopy RF signal simulation adequacy are an insufficient knowledge of the scanner and phantom’s parameters. The attempt made for the quantitative evaluation of simulation uncertainties shows both problems and the potential of echoscopy simulation in imaging technology developments. The analysis presented could be interesting for researchers developing quantitative ultrasound imaging and elastography technologies looking for simulated raw RF signals comparable to those obtained from real ultrasonic scanning.

scholarly journals Acousto-Optic Cells with Phased-Array Transducers and Their Application in Systems of Optical Information Processing

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 451
Author(s):  
Vladimir Balakshy ◽  
Maxim Kupreychik ◽  
Sergey Mantsevich ◽  
Vladimir Molchanov
Keyword(s):  
Phased Array ◽  
Power Conversion ◽  
Experimental Studies ◽  
Acoustic Power ◽  
Acoustic Mode ◽  
Bragg Angle ◽  
Excitation Band ◽  
Acousto Optic Interaction ◽  
Array Transducer ◽  
New Type

This paper presents the results of theoretical and experimental studies of anisotropic acousto-optic interaction in a spatially periodical acoustic field created by a phased-array transducer with antiphase excitation of adjacent sections. In this case, contrary to the nonsectioned transducer, light diffraction is absent when the optical beam falls on the phased-array cell at the Bragg angle. However, the diffraction takes place at some other angles (called “optimal” here), which are situated on the opposite sides to the Bragg angle. Our calculations show that the diffraction efficiency can reach 100% at these optimal angles in spite of a noticeable acousto-optic phase mismatch. This kind of acousto-optic interaction possesses a number of interesting regularities which can be useful for designing acousto-optic devices of a new type. Our experiments were performed with a paratellurite (TeO2) cell in which a shear acoustic mode was excited at a 9∘ angle to the crystal plane (001). The piezoelectric transducer had to nine antiphase sections. The efficiency of electric to acoustic power conversion was 99% at the maximum frequency response, and the ultrasound excitation band extended from 70 to 160 MHz. The experiments have confirmed basic results of the theoretical analysis.

Inter-costal Liver Ablation Under Real Time MR-Thermometry With Partial Activation Of A HIFU Phased Array Transducer

2010 ◽  
Author(s):  
Bruno Quesson ◽  
Mathilde Merle ◽  
Max Köhler ◽  
Charles Mougenot ◽  
Sebastien Roujol ◽  
...  
Keyword(s):  
Real Time ◽  
Phased Array ◽  
Mr Thermometry ◽  
Liver Ablation ◽  
Partial Activation ◽  
Array Transducer

scholarly journals Improved Shear Wave Motion Detection Using Pulse-Inversion Harmonic Imaging With a Phased Array Transducer

2013 ◽  
Vol 32 (12) ◽  
pp. 2299-2310 ◽  
Author(s):  
Pengfei Song ◽  
Heng Zhao ◽  
Matthew W. Urban ◽  
Armando Manduca ◽  
Sorin V. Pislaru ◽  
...  
Keyword(s):  
Shear Wave ◽  
Motion Detection ◽  
Wave Motion ◽  
Phased Array ◽  
Harmonic Imaging ◽  
Array Transducer ◽  
Pulse Inversion ◽  
Pulse Inversion Harmonic Imaging

scholarly journals Relationship between the voltage applied to MZM arms and the generation of optical frequency comb

2018 ◽  
Vol 7 (4.15) ◽  
pp. 405
Author(s):  
Yousif I. Hammadi ◽  
Tahreer S. Mansour
Keyword(s):  
Continuous Wave ◽  
Frequency Comb ◽  
Optical Frequency Comb ◽  
Laser Source ◽  
Optical Frequency ◽  
High Data ◽  
Rate Transmission ◽  
Rf Signals ◽  
Rf Signal ◽  
Data Rate Transmission

In this study, an optical frequency comb source (OFCS) based on a dual-drive Mach–Zehnder modulator (MZM) is constructed and theoretically demonstrated. A mathematical model of the constructed OFCS is then built to investigate the effect of the peak-to-peak radio frequency (RF) signals applied to the MZM arms on the generated optical frequency comb (OFC) lines at the MZM output. A dual-drive MZM, a continuous wave laser source, and an RF signal source are included in the OFCS. The chirp parameter can be controlled and 64 comb lines generated at a comb spacing of 25 GHz by regulating voltages applied to the MZM arms. The developed OFCS is relatively simple but valuable. The generated OFC lines can be used for high data-rate transmission.  

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