Multiple Annular Ring Capacitive Micromachined Ultrasonic Transducer Arrays for Forward-Looking Intravascular Ultrasound Imaging Catheters

2007 ◽  
Author(s):  
Rasim O. Guldiken ◽  
Jaime Zahorian ◽  
Mujdat Balantekin ◽  
Mustafa Karaman ◽  
F. Levent Degertekin
Keyword(s):  
Real Time ◽  
Intravascular Ultrasound ◽  
Signal To Noise Ratio ◽  
Ultrasonic Transducer ◽  
Transimpedance Amplifiers ◽  
Silicon Area ◽  
Annular Ring ◽  
Intravascular Ultrasound Imaging ◽  
Array Configuration ◽  
Forward Looking

We investigate multiple-annular-ring CMUT array configuration for forward-looking intravascular ultrasound (FL-IVUS) imaging. This configuration has the potential for independent optimization of each ring and uses the silicon area more effectively without any particular drawback. We designed and fabricated a sample 1mm diameter dual annular ring CMUT test array which consists of 24 transmit and 32 receive elements. For imaging experiments, we designed IC chips that contain 8 transimpedance amplifiers, a multiplexer and a buffer. The real time-pulse echo experiments obtained with designed IC electronics show 26dB Signal to Noise Ratio (SNR) from a 3.5 mm away aluminum reflector in oil. This paper presents our first efforts in obtaining real time imaging with designed IC chips which is one step before CMUT on CMOS implementation.

Real-time intravascular ultrasound imaging in humans

1990 ◽  
Vol 65 (20) ◽  
pp. 1392-1396 ◽  
Author(s):  
Natesa G. Pandian ◽  
Andreas Kreis ◽  
Andrew Weintraub ◽  
Amir Motarjeme ◽  
Mark Desnoyers ◽  
...  
Keyword(s):  
Real Time ◽  
Intravascular Ultrasound ◽  
Ultrasound Imaging ◽  
Intravascular Ultrasound Imaging

scholarly journals Phase Stability under Thermal Drifts in Photodiode-Conditioning Transimpedance Amplifiers for Distance Metrology

Sensors ◽  
2021 ◽  
Vol 21 (10) ◽  
pp. 3455
Author(s):  
Francisco Javier Meca Meca ◽  
Ernesto Martín-Gorostiza ◽  
Miguel Ángel García-Garrido ◽  
David Salido-Monzú
Keyword(s):  
Delay Time ◽  
Measurement Errors ◽  
Continuous Wave ◽  
Signal To Noise Ratio ◽  
Circuit Board ◽  
Transimpedance Amplifiers ◽  
Optical Distance ◽  
High Measurement ◽  
Analytic Expressions ◽  
Measured Distance

Transimpedance amplifiers (TIA) are widely used for front-end signal conditioning in many optical distance measuring applications in which high accuracy is often required. Small effects due to the real characteristics of the components and the parasitic elements in the circuit board may cause the error to rise to unacceptable levels. In this work we study these effects on the TIA delay time error and deduce analytic expressions, taking into account the trade-off between the uncertainties caused by the delay time instability and by the signal-to-noise ratio. A specific continuous-wave phase-shift case study is shown to illustrate the analysis, and further compared with real measurements. General strategies and conclusions, useful for designers of this kind of system, are extracted too. The study and results show that the delay time thermal stability is a key determinant factor in the measured distance accuracy and, without an adequate design, moderate temperature variations of the TIA can cause extremely high measurement errors.

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