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Why there is a need for pulsing of signal in ultrasound transducer? 

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In addition, pulsed ultrasound limits transducer heating, thus allowing for higher acoustic energies than those currently employed with continuous ultrasound.
Together, these findings indicate that low-intensity ultrasound pulsing, if applied on the order of minutes, would reversibly perturb the physical and subcellular structures of living cells.
This definition is consistent with modern pulsed transducer arrays and accounts for the need to impose a signal/noise threshold.
Open accessProceedings ArticleDOI
R. F. Anastasi, Eric I. Madaras 
01 Jan 1999
17 Citations
To increase ultrasound signal levels and improve the ultrasound signal-to-noise ratio without exceeding laser power limitations, it is possible to use pulse compression techniques.
It also appears that the measured attenuation in ultrasound amplitude is primarily due to the loading of the sample by the contact transducer.
It is concluded that an ultrasound transducer mounted on a cardiac catheter can produce lesions that may be useful for ablation of cardiac arrhythmias.
In medical ultrasound imaging however, the combination of frequency and depth dependent attenuation, dispersion, harmonic generation, beamforming errors, and limited transducer bandwidth create a more complicated case for a pulse compressed system that is far from the ideal.
Therefore, we conclude that the addition of the post-linearizer to the HVPA is a potentially useful electronic technique for improving echo signal quality in medical ultrasound transducers.
The transducer also has more than 100% fractional bandwidth around 3 MHz, which makes it suitable for ultrasound imaging.

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