Re: Vernix Caseosa - at what gestational age is it first seen by
From: Wolfgang Moroder, MD (womorode@tin.it)
Sat Feb 16 14:07:47 2002
Allen, I do not have any specific literature in mind right now but there
are a few excellent pages explaining scattering and its relation to the
frequency of the USbeam on this book: Diagnostic Ultrasound: Principles
and Instruments by Frederick W. Kremkau, W.B. Saunders Company 1998 on
page 52.
Wolfgang Moroder
At Fri, 15 Feb 2002, Allen Worrall wrote:
>
>Wolfgang, do you have any references to the Tyndall effect as it relates to
>transvaginal prenatal sonography?
>
>Allen
>
>Joseph A Worrall MD RDMS
>The Fairbanks Clinic
>1919 Lathrop Street, Suite 100
>Fairbanks, AK 99701
>jworrall@alaska.net
>1 907 451 4225
>
>>>----- Original Message -----
>From: "Wolfgang Moroder, MD" <womorode@tin.it>
>To: "Multiple recipients of list ULTRASOUND"
><ultrasound@mail.medispecialty.com>
>Sent: Thursday, February 14, 2002 8:10 AM
>Subject: Re: Vernix Caseosa - at what gestational age is it first seen by
>
>> I would like to remind that there is the Tyndall effect which is
>> particularly present with transvaginal probes using higher frequencies
>> and which permits to visualize microscopical particles suspended in a
>> fluid and normally not visible to the naked eye. There is an excellent
>> website describing this physical phenomenon here:
>> http://www.svpvril.com/Tyndall.html#TOP
>> regards
>> Wolfgang Moroder
>>
>> At Wed, 13 Feb 2002, DuBose, Terry wrote:
>> >
>> >It might depend upon how early in gestation. If the amnion and chorion
>is
>> >not fused, then the material between, called the "magma reticular" by
>Creasy
>> >& Resnik, is slightly echogenic... very slightly, but more than the
>amniotic
>> >fluid. But if it is after the 1st trimester I doubt it would be the
>magma
>> >reticular.
>> >
>> >Peace, Terry J. DuBose, M.S., RDMS
>> >Assistant Professor & Director, Diagnostic Medical Sonography Program
>> >CHRP, University of Arkansas for Medical Sciences
>> >Little Rock, Arkansas, USA
>> >501-686-6510
>> >http://www.io.com/~dubose/
>> >http://www.uams.edu/CHRP/dmshome.htm
>> >http://www.obgyn.net/us/panel/panel.htm
>> >
>> >-----Original Message-----
>> >From: Allen Worrall [mailto:jworrall@alaska.net]
>> >Sent: Wednesday, February 13, 2002 2:59 PM
>> >To: Multiple recipients of list ULTRASOUND
>> >Subject: Re: Vernix Caseosa - at what gestational age is it first seen
>> >by
>> >
>> >Art, is the "crud" inside the amniotic? The "crud" that I saw yesterday
>was
>> >inside. Echopenic areas between the internal os and the amnion I would
>> >assume to be old blood or clot.
>> >
>> >Allen
>>
>> --
>> Wolfgang Moroder, MD
>> Prenatal Unit
>> Bolzano General Hospital Italy
--
Wolfgang Moroder, MD
Prenatal Unit
Bolzano General Hospital Italy
