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Doppler_historyFrom: Terry J DuBose (tjdubose@juno.com)Sat May 18 11:25:40 2002
This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. ----__JNP_000_47f0.15ad.23b8 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Dear Dr. Stevenson, I want to thank you for providing the video of the first color M-mode Doppler to Ultrasound-History@OBGYN.net. Geoffrey Stevenson’s Email describing the history of the video I have a couple of questions. In your Email describing the video there is this: "It was shown during two abstracts at the American Heart Association meeting in Anaheim, November 1999." I am assuming this was a typo and should have been 1979... correct? Also, in this first Doppler video there is no Color Bar & Scale... did this video use the "Blue away and Red toward" configuration to represent flow toward or away from the transducer? If so can you add anything to the history of this color map usage? I ask this because in all the other physical sciences, particularly astronomy, red shifts demonstrate longer wave lengths, where as blue shifts represent shorter shifts. Do you know when or why medical ultrasound started using a configuration that was the reverse of the astronomical view? Thanks again for your help and participation. Peace, Terry J DuBose Chair, Ultrasound@OBGYN.net ----__JNP_000_47f0.15ad.23b8 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> Dear Dr. Stevenson, I want to thank you for providing the video of the
first color M-mode Doppler to Ultrasound-History@OBGYN.net.
I have a couple of questions. In your Email describing the video
there is this: "It was shown during two abstracts at the American Heart
Association meeting in Anaheim, November 1999." I am assuming this was a
typo and should have been 1979... correct?
Also, in this first Doppler video there is no Color Bar & Scale... did
this video use the "Blue away and Red toward" configuration to represent flow
toward or away from the transducer? If so can you add anything to the
history of this color map usage? I ask this because in all the other
physical sciences, particularly astronomy, red shifts demonstrate longer wave
lengths, where as blue shifts represent shorter shifts. Do you know
when or why medical ultrasound started using a configuration that was the
reverse of the astronomical view?
Thanks again for your help and participation.
Peace, Terry J DuBose
Chair, Ultrasound@OBGYN.net
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