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Home > Archive > Pathology > December 2004 > Ultrasound diagnose blocked neck artery ?
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Ultrasound diagnose blocked neck artery ?
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| not@top-post 2004-10-04, 2:21 am |
| A 75 yo woman, with poor medical facilities here in s. africa, told
me how, on a paid visit to her family in Finland, the doctor had
mentioned about ultrasound diagnosis [he didn't have the facilties
at the time] for her suspected blocked neck artery.
I understand that the resolution of 'detection' by any medium
is limited to the wavelength. And since ultrasound has a relatively
long wavelength, resolution below 1mm. would not be possible.
I imagine that sub-mm resultion would be needed to detect
artery blockage ?
Please tell: in what way am I mistaken ?
Thanks,
== Chris Glur.
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| Howard McCollister 2004-10-04, 2:21 am |
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<not@top-post> wrote in message news:Qt-dndVpbNL8S8LcRVn-tA@is.co.za...
> A 75 yo woman, with poor medical facilities here in s. africa, told
> me how, on a paid visit to her family in Finland, the doctor had
> mentioned about ultrasound diagnosis [he didn't have the facilties
> at the time] for her suspected blocked neck artery.
>
> I understand that the resolution of 'detection' by any medium
> is limited to the wavelength. And since ultrasound has a relatively
> long wavelength, resolution below 1mm. would not be possible.
>
> I imagine that sub-mm resultion would be needed to detect
> artery blockage ?
>
> Please tell: in what way am I mistaken ?
Did you do a google search? This is utterly basic information...start with
http://www.emedicine.com/neuro/topic47.htm
HMc
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| Emma Chase VanCott 2004-10-04, 2:21 am |
| In sci.med not@top-post wrote:
: A 75 yo woman, with poor medical facilities here in s. africa, told
: me how, on a paid visit to her family in Finland, the doctor had
: mentioned about ultrasound diagnosis [he didn't have the facilties
: at the time] for her suspected blocked neck artery.
: I understand that the resolution of 'detection' by any medium
: is limited to the wavelength. And since ultrasound has a relatively
: long wavelength, resolution below 1mm. would not be possible.
: I imagine that sub-mm resultion would be needed to detect
: artery blockage ?
Sometimes dentists can pick up deposits on dental Xrays,
usually, incidentally.
Cannot comment on this particular case. In the West, don't we use
angiograms?
Emma
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| Steve Harris sbharris@ROMAN9.netcom.com 2004-10-04, 2:21 am |
| not@top-post wrote in message news:<Qt-dndVpbNL8S8LcRVn-tA@is.co.za>...
> A 75 yo woman, with poor medical facilities here in s. africa, told
> me how, on a paid visit to her family in Finland, the doctor had
> mentioned about ultrasound diagnosis [he didn't have the facilties
> at the time] for her suspected blocked neck artery.
>
> I understand that the resolution of 'detection' by any medium
> is limited to the wavelength. And since ultrasound has a relatively
> long wavelength, resolution below 1mm. would not be possible.
>
> I imagine that sub-mm resultion would be needed to detect
> artery blockage ?
>
> Please tell: in what way am I mistaken ?
>
> Thanks,
>
> == Chris Glur.
COMMENT:
You're mistaken in the basic physics. Diagnostic ultrasound uses
frequences up to 5 Mhz for examination of superficial structures like
neck arteries. If you use the velocity of sound in the medium (1500
m/sec or so) you'll see the implied wavelength is on the order of 0.3
mm.
SBH
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| You can also monitor fluid flow by ultrasound suing doppler shifts. So
rather tahn resolving a specific lesion, you are looking for diminished
blood flow
<not@top-post> wrote in message news:Qt-dndVpbNL8S8LcRVn-tA@is.co.za...
> A 75 yo woman, with poor medical facilities here in s. africa, told
> me how, on a paid visit to her family in Finland, the doctor had
> mentioned about ultrasound diagnosis [he didn't have the facilties
> at the time] for her suspected blocked neck artery.
>
> I understand that the resolution of 'detection' by any medium
> is limited to the wavelength. And since ultrasound has a relatively
> long wavelength, resolution below 1mm. would not be possible.
>
> I imagine that sub-mm resultion would be needed to detect
> artery blockage ?
>
> Please tell: in what way am I mistaken ?
>
> Thanks,
>
> == Chris Glur.
>
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