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Susan Magee
Director, Education Department
Keep Georgia on Your Mind!
2002 SDMS Annual Conference
Atlanta, Georgia
October 3-6, 2002
-----Original Message-----
From: Cindy Rapp Sent: Friday, March 08, 2002 11:34 AM
To: Terry Dubose (Work); 'ultrasound@obgyn.net'
Cc: 'SANGHVI5M@aol.com'; Susan Magee
Subject: Re: cme test
I know that physics questions are always a problem to understand. Upon further investigation there is ambiguity in the way that I worded this question. (I have to admit Physics is NOT one of my strengths, I should have just stuck to breast questions). I spoke with the "Big Guru" Sid Edelman, about this question. The way that we all learn the difference between axial and lateral resolution is... axial resolution best defines two structures that are on top of each other. Which is what Mahesh was thinking about this question and what the physics books teach.
Mahesh, thanks for pointing out this confusing issue. If I use Lateral resolution in the question it goes along with what the books are teaching. The point I was originally making was that we see the structures that are parallel to the chest wall (such as ducts) best with good axial resolution. (because the anterior and posterior surface of the duct are seen as structures on top of each other, but this is confusing when you think about what we learn from the books. Thanks for your input.
I think it would be best if we reword the question to avoid any further confusion to...
Lateral resolution best identifies structures that are
a) perpendicular to the chest wall
b) course parallel to the chest wall
c) perpendicular to the beam
d) a and c
e) b and c (Correct answer)
Rapper
-----Original Message-----
From: DuBose, Terry [mailto:DuboseTerryJ@uams.edu]
Sent: Friday, March 08, 2002 7:33 AM
To: 'ultrasound@obgyn.net'
Cc: 'SANGHVI5M@aol.com'; Cindy Rapp (E-mail); Don Haydon @ SDMS (E-mail)
Subject: Re: cme test
Dear SANGHVI5M@aol.com
I fear you have confused what is meant by perpendicular in this context. It is true that the best resolution is with the axial resolution, and the best echoes are returned by those structures (specular reflections from flat surfaces) that are perpendicular to the direction of beam travel, i.e. perpendicular to the axis of the beam.
Lateral resolution are those structures that are measured transversely (perpendicular) to the beam, using beam width resolution.
I can see this is a bit confusing. I hope this helps, if not please ask more questions and we will try to respond.
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: SANGHVI5M@aol.com [mailto:SANGHVI5M@aol.com]
Sent: Friday, March 08, 2002 7:45 AM
To: Multiple recipients of list ULTRASOUND
Subject: cme test
as per your article on breast, i took the cme test at the end of the articl. The question was axial resolution best identifies structures that are ,perpendicular to the beam is an incorrect answer, As went through my physics books, it is showing that best axial resolution is seen in the same axis of the beam and not perpendicular, please clarify which is the correct answer, also, the perpendicular to beam gives the best lateral resolution.
please e mail me back with your in put and wether my answer is write or wrong.
