Re: Lawson: AIUM says thousands of Fetal Photo Places !!!!
From: art fougner, md (evsono@pipeline.com)
Wed Oct 30 09:35:52 2002
Terry -
have observed many with multiple fat lines - others with ones not so
prominent - yet with the same AC's. would think this might play a large
role in error.
art
At Mon, 28 Oct 2002, Terry J. DuBose wrote:
>
>Good points... I wonder how much difference there is in fetal tissue density? Would this not be accounted for by regression analysis based upon volumetric measurements? We aren't dealing with weight lifting fetuses on steroids here.
>
>I would think that the age-liver-volume might be a fairly good predictor of overall tissue density... in addition with the abdominal, long bones and cranial volumes we might arrive at some better estimates of weight, ages, and fetal condition (TORCH infections).
>
>If there really is much difference in the fetal tissue density, then more measurements could increase the error. But Hadlock found that more measurements (up to 4) did increase accuracy.
>
>We are just in the infancy of sonography... 25-30 years of general use and equipment development is not much... it will get better.
>
>Peace, Terry J DuBose, M.S., RDMS
>
>ultrasound@obgyn.net writes:
>>not sure about age but i would guess that weight's will always be
>>problematic. first measuring someone's waist line may be predictive but
>>pales in comparison to standing on a scale. additionally, until there's
>>a way to compensate for individual variation in tissue density - eg fat
>>vs muscle content - there will always be errors.
>>
>>more dimensions might actually increase the error.
>>
>>just my opinion - i could be wrong.
>>
>>art
>
>Peace, Terry J. DuBose, M.S., RDMS
>Assistant Professor & Director, Diagnostic Medical Sonography Program
>University of Arkansas for Medical Sciences, CHRP
>4301 West Markham St. Mail Slot #563
>Little Rock, Arkansas, 72205 USA
>501-686-6510
>DuBoseTerryJ@UAMS.edu
>http://www.io.com/~dubose/
>http://www.uams.edu/CHRP/dmshome.htm
>http://www.obgyn.net/us/panel/panel.htm
--
art fougner, md
ich bin ein New Yorker
