Fiducial Markers Flashcards
1
Q
what are they
A
reliable surrogates for imaging anatomic structures
2
Q
function of fiducials
A
good visualisation of soft tissue that do not provide sufficient contrast for delineation
3
Q
fiducial important for
A
smaller margins
online corrections
4
Q
fiducials have a high
A
Z number
5
Q
CT prostate uses
A
fiducial viewing
6
Q
US prostate uses
A
fiducial placement
7
Q
CT artefacts from fiducials
A
metallic objects absorb lots of radiation bc of high Z number tf signal after going thru fid. will be different.
This means less simult eq —— losing info
