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Re: Physicis Question From: Dr.Udayakumar (udaya@md2.vsnl.net.in) Wed Nov 1 02:05:18 2000 Messages sorted by: [ date ][ thread ][ subject ][ author ] Next message: Susan Brennan: "PREGNANCY vaginal and regular ultra sound" Frame averaging is a Preprocessing event. You have me thinking about "function within memory". Bit confused, now that you have raised the subject. ..Udayakumar DuboseTerryJ@exchange.uams.edu wrote: > Folks, A question has come up about instrumentation and while we think we > have an answer, we would like confirmation. > > Is "image persistence" or "frame averaging" a "preprocessing" or > "postprocessing" function? > > Zagzebski J: Essentials of Ultrasound Physics, Mosby 1996, p. 77, has it as > preprocessing. > > Hedrick, Hykes, & Starchman: Ultrasound Physics & Instrumentation, 3rd E, > Mosby 1995. p. 223, has it as postprocessing. > > Because preprocessing is what happens before the image goes into memory, and > postprocessing is after memory; it seems to me that persistence is neither > pre or post... but is a function within memory. That is, how many frames > are overlaid or averaged in the memory. > > Our concern is that the question may come up on the ARDMS Physics & > Instrumentation Exams and we are not sure what to tell our students... any > hints out there as to how (if) this question comes up on the exams? > > Thanks. > > Tony Baker, B.S., RDMS, RVT, CNMT, Instructor > 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 Next message: Susan Brennan: "PREGNANCY vaginal and regular ultra sound"

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