[Q] ultrasonic transducer array with CW

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Steve - 09 Nov 2004 09:31 GMT

Dear all,

It seems all ultrasound imaging systems make use of phased array with
short pulses. I am curious to know if any application makes use of
array with continuous waves in ultrasound.

Thanks.

Steve

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Dr. Andrew B. Chung, MD/PhD - 09 Nov 2004 14:41 GMT

> Dear all,
>
> It seems all ultrasound imaging systems make use of phased array with
> short pulses. I am curious to know if any application makes use of
> array with continuous waves in ultrasound.

Continuous waves are useful to sort out aliasing that could be
problematic with pulsed waves.

> Thanks.

You are welcome, Steve. All praises belong to my heavenly Father, Whom I
love with all my heart, soul, mind, and strength :-)

Servant to the humblest person in the universe,

Andrew

--
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Board-Certified Cardiologist
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Steve - 10 Nov 2004 01:34 GMT

Thanks, Andrew,

From the reading on ultrasound medical, the pulse echo imaging with a
phased array is widely used. I have a few questions

1. in pulse echo imaging, how to control the transmit focal length
using an array? using composite transmit focus technique, several
sweeps are used to generate a complete image.

2. I noticed CWs are used in doppler ultrasound and a single element
seems can do the job. Have you ever heard any array in this kind of
applications? On the 'sort out aliasing', could it be more specific?

Steve.

> > It seems all ultrasound imaging systems make use of phased array with
> > short pulses. I am curious to know if any application makes use of
[quoted text clipped - 4 lines]
>
> --

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Dr. Andrew B. Chung, MD/PhD - 10 Nov 2004 14:29 GMT

> Thanks, Andrew,
>
[quoted text clipped - 4 lines]
> using an array? using composite transmit focus technique, several
> sweeps are used to generate a complete image.

I believe the transmit focal length is fixed for an array.

> 2. I noticed CWs are used in doppler ultrasound and a single element
> seems can do the job. Have you ever heard any array in this kind of
> applications? On the 'sort out aliasing', could it be more specific?
>
> Steve.

I've seen arrays used in 2D doppler applications in CW mode to remove
aliasing artifacts.

Servant to the humblest person in the universe,

Andrew

--
Dr. Andrew B. Chung, MD/PhD
Board-Certified Cardiologist
http://www.heartmdphd.com/

**
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http://makeashorterlink.com/?L26062048

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