User generated analysis tree library

Help out your colleagues by donating the analysis trees that you have created for any phantoms that other people might want to use!

Simply attach the analysis tree to this topic, then edit the topic to tell us what phantom or test the analysis tree is for, and any information that might be needed to use it.

Analysis trees donated here might in future be distributed with the core IQWorks download.



As presented at the IPEM Quantitative Analysis meeting on 04/10/2010, the analysis tree "edge_MTF_with_fixer" plots an MTF for an edge, and is optimised to match the MTF analysis provided in Nick Marshall's Obj_IQ_reduced. It was created with IQWorks version 0.5.

NB by default, the properties of the general fixer do not change the pixel size. To change this, in the fixer properties adjust "Adjust Pixel Size" to TRUE and enter corrected pixel size.

Any comments, please email me at

-- LaurenceKing? - 05 Oct 2010

Flatness, Deviation and Symmetry (FDS_Analysis)

An analysis tree to calculate flatness, symmetry and deviation of a 20 x 20 cm radiation field. The field does not need to be centred in the image, but must not be at an angle. Flatness and deviation are calculated according to IEC 1989, using a flattened area which is 80% of the width and height of the field size. Symmetry is an approximation to IEC 1989 using sixteen discrete 2 x 2 mm ROIs.

For full details please see the attached PDF (FDS_User_Notes).

This tree is for educational use only and not for clinical applications.

Please send any comments/bugs to

-- MikeHughes? - 24 Jan 2011

NPS (IPEM 32 part vii method)

David Platten has supplied an analysis tree to calculate NPS, with instructions under the Documentation section of this site - I thought a link to it would be useful under this topic.

Link to NPS analysis tree

-- LaurenceKing? - 11 Jul 2011

Topic attachments
I Attachment Action Size Date Who Comment
FDS_Analysis.xmlxml FDS_Analysis.xml manage 86.3 K 24 Jan 2011 - 17:06 UnknownUser Flatness, Deviation and Symmetry for 20 x 20 cm field.
FDS_User_Notes.pdfpdf FDS_User_Notes.pdf manage 89.3 K 24 Jan 2011 - 17:06 UnknownUser User Notes for Flatness, Deviation and Symmetry Analysis
edge_MTF_with_fixer.xmlxml edge_MTF_with_fixer.xml manage 2.9 K 05 Oct 2010 - 11:12 UnknownUser MTF Analysis tree as presented at 2010 IPEM Quantitative Analysis meeting
Topic revision: 19 Jan 2013, EdMcDonagh

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