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Medical Forum / General / General / December 2004Ultrasound diagnose blocked neck artery ?
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. > 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 [quoted text clipped - 9 lines] > > 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 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 > 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 [quoted text clipped - 13 lines] > > == 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 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 > 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 [quoted text clipped - 13 lines] > > == Chris Glur.
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