FW: [ RadSafe ] radiographic spatial resolution

DODGE, CHARLES (JSC-SD)[WYLE LABORATORIES] charles.dodge at nasa.gov
Thu Jun 25 15:16:45 CDT 2009


If I understand your question correctly, the focal spot size is indeed the main factor in image resolution. However, things such as an anti-scatter grid and patient scatter will also degrade the resolution. Therefore in mammography , for example, compliance is measured in the number of specs, fibers and masses that can be seen on an image of a standard imaging phantom. I seem to recall a rule of thumb type of calculation for focal spot size to Lp/mm but that will have been far too long ago for anything other than memory remnants. 

This may also shed some light " Med. Phys. Volume 24, Issue 1, pp. 11-15 (January 1997)"

Charles W. Dodge, Ph.D.
NASA, Johnson Space Center
Bldg.15 Rm266
Houston, TX.
Fax 281-244-1768
Ph 281-244-6761

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On Behalf Of Mike
Sent: Thursday, June 25, 2009 12:14 PM
To: radsafe at radlab.nl
Subject: [ RadSafe ] radiographic spatial resolution

HELLO there!

I am wondering if there is a protocol which states what spatial resolution
an analog radiographic system should have. If for example I have a spatial
resolution of 5 lp/mm isn;t this enough information that may substitute the
focal spot size?
I have read AAPM report 74 and there is no statement about spatial

Any help will be highly appreciated.
Thanks in advance,
You are currently subscribed to the RadSafe mailing list

Before posting a message to RadSafe be sure to have read and understood the RadSafe rules. These can be found at: http://radlab.nl/radsafe/radsaferules.html

For information on how to subscribe or unsubscribe and other settings visit: http://radlab.nl/radsafe/

More information about the RadSafe mailing list