CDMAM Readout

Automated Readout (CDCOM)

CDCOM version 1.6


In Spring 2011 problems concerning the physico-technical quality control using CDMAM3.4 and CDCOM have been observed on some mammography systems. As stated in our letter of 18th May, 2011 EUREF and Artinis Medical Systems B.V. were aware of the importance of these problems and therefore combined forces to analyze and solve the problem. This has resulted in a new version of CDCOM (version 1.6)

Changes in CDCOM version 1.6 compared to version 1.5.2.

In CDCOM version 1.5.2 the position of the gold discs of the CDMAM phantom were estimated using the gridlines of the phantom. Gridline variations resulted in an inaccurate estimation of the gold disc positions. With the small gold disc search area used in CDCOM version 1.5.2 this led to incorrect scores for some specific phantom images.
In CDCOM version 1.6 the position of the gold discs is estimated using the discs on the phantom which are clearly visible in combination with a template with the actual position of all discs.
This template is translated, rotated and skewed for an optimal fit to the phantom.

Evaluation of CDCOM version 1.6

We have performed an extensive evaluation and have received data from several third parties for this purpose. The new version solves the problem concerning incorrect estimated gold disc position. We have evaluated this version using the following method, which is suggested in the forthcoming supplement to the European Guidelines:

  • The individual CDCOM scores are added up to a detection matrix
  • This matrix is smoothed using a Gaussian function
  • A psychometric curve has been constructed for each diameter and the 62.5% points are determined on this curve
  • A third order polynomial function has been fitted to all 62.5% points, coefficients >0

Due to (small) differences in the search area which is used in the old and new version of CDCOM, scores of individual CDMAM images are very much alike but not 100% identical. However, for series of phantom images which did not have problems with the inaccurate estimate of gold disc positions, scores of series are similar. For series of phantom images which did have problems the score should be as expected using CDCOM version 1.6.

More information about the evaluation of CDCOM which has led to version 1.6 can be found in the downloadable pdf-file below.

Remarks: In the evaluation of CDCOM the presence of artefacts may influence the score. Furthermore care has to be taken that the 62.5% points on the psychometric curve are actually on the phantom, extrapolation might introduce inaccurate results.

In spite of our extensive evaluation of this new version, in special cases it might happen that unexpected bugs appear. We kindly ask users of this version to report bugs, so proper action can be taken.



CDCOM software (version 4.0) for CDMAM4.0


Guildford CDMAM Analyser

The Guildford CDMAM Analyser version 1.5.5 (from the NCCPM in Guildford) including software and instruction manual for automated determination of threshold contrast can be downloaded below.

The required 'MATLAB Compiler Runtime (MCR)' as described in the instruction manual can be downloaded using the following internet link:

Latest news

Workshop on quality control in breast tomosynthesis in Vienna on September 11th, 2015

In this workshop the physic-technical steering group will give an overview on breast tomosynthesis systems, provide insights of the why’s of measurements, will give practical tips for QC measurements and explain the software which is made available by the centres who participated in drafting the protocol.


More information can be found here.

Breast tomosynthesis quality control protocol version 1.0 available

We are pleased to announce that version 1.0 of this protocol has been made available via the website. We believe that this facilitates and will harmonize QC measurements on breast tomosynthesis systems.


More information and the protocol can be found here.

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