P0-18 Forward-Looking IVUS Imaging Using a Dual-Annular Ring CMUT Array: Experimental Results

2007 ◽  
Author(s):  
R. Guldiken ◽  
J. Zahorian ◽  
G. Gurun ◽  
M.S. Qureshi ◽  
M. Balantekin ◽  
...  
Keyword(s):  
Experimental Results ◽  
Annular Ring ◽  
Ivus Imaging ◽  
Forward Looking

Stresses in compact end closures for cylindrical pressure vessels

1969 ◽  
Vol 4 (1) ◽  
pp. 57-64
Author(s):  
R W T Preater
Keyword(s):  
Cylindrical Shell ◽  
Rigid Body ◽  
Optimum Design ◽  
Cross Section ◽  
Experimental Verification ◽  
Pressure Vessels ◽  
Rigid Body Motion ◽  
Experimental Results ◽  
Body Motion ◽  
Annular Ring

Three different assumptions are made for the behaviour of the junction between the cylindrical shell and the end closure. Comparisons of analytical and experimental results show that the inclusion of a ‘rigid’ annular ring beam at the junction of the cylider and the closure best represents the shell behaviour for a ratio of cylinder mean radius to thickness of 3–7, and enables a prediction of an optimum vessel configuration to be made. Experimental verification of this optimum design confirms the predictions. (The special use of the term ‘rigid’ is taken in this context to refer to a ring beam for which deformations of the cross-section are ignored but rigid body motion is permitted.)

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.

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