FW: [ RadSafe ] radiographic spatial resolution

[DODGE, CHARLES (JSC-SD)[WYLE LABORATORIES]]

Manos

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
resolution.

Any help will be highly appreciated.
Thanks in advance,
Manos
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