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Evaluation of CDCOM version 1.6

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Problem description

CDCOM version 1.5.2:

As a first approximation of the position ofthe gold discs the gridlines of the phantom

Variations in gridline position led to aninaccurate estimation.

Combined with the size of the search areathis led to incorrect scores for some

specific phantom images.

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CDCOM version 1.6

CDCOM version 1.6.0:

A template of the phantom with all discpositions is translated, rotated and skewed

discs on the images.

For this estimate of the position of the

discs a relatively large search area is used For the actual detection a similar search

area compared to version 1.5.2. is used toget similar detection results

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Evaluation of CDCOM 1.6

Internally two new CDCOM versions have

been made with different methods toestimate the position of the gold discs

version 1.5.2

Debug CDCOM versions have been made

in which each step in the programme couldbe checked

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Evaluation of CDCOM 1.6

A CDMAM phantom was made with only

thick discs

Using subsets of the visible discs the

search area could be evaluated

The three CDCOM versions (1.5.2 and two

new versions) were compared to eachother using numerous CDMAM series

Partly in debug mode

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Evaluation of CDCOM 1.6

Series of images from each manufacturer

have been used to evaluate CDCOM 1.6(between 8 to 164 images per series)

been used (each of these comparisonsincorporated 2 to 26 phantoms)

In total images from approximately 90CDMAM phantoms have been obtainedand used in the evaluation

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Evaluation of CDCOM 1.6

1.000

10.000

Example 1: DR system 1

0.010

0.100

0.10 1.00

CDCOMnew1_1766

CDCOMold_1766

CDCOMnew2_1766

CDCOM1.6

CDCOM old = CDCOM version 1.5.2.CDCOMnew1 and CDCOMnew2 are the two internally used new versions of CDCOMCDCOM 1.6 = CDCOMnew1 plus some features from CDCOMnew2, thecomplete evaluation has been redone with version 1.6

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Evaluation of CDCOM 1.6

1.000

10.000

Example 2: DR system 2

0.010

0.100

0.10 1.00

CDCOMnew1_1002

CDCOMold_1002

CDCOMnew2_1002

CDCOM1.6

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Evaluation of CDCOM 1.6

1.000

10.000

Example 3: DR system 3

0.010

0.100

0.10 1.00

CDCOMold_1077

CDCOM1.6

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Evaluation of CDCOM 1.6

1.000

10.000

Example 4: CR system

0.010

0.100

0.10 1.00

CDCOMold_1002

CDCOM1.6

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Evaluation of CDCOM 1.6

1.000

10.000

Example 5: CR system

0.010

0.100

0.10 1.00

CDCOMnew1_1002

CDCOMold_1002

CDCOMnew2_1002

CDCOM1.6

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Evaluation of CDCOM 1.6

1.000

10.000

Example 6: DR system

0.010

0.100

0.10 1.00

CDCOMnew1_1002

CDCOMold_1002

CDCOMnew2_1002

CDCOM1.6

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Evaluation of CDCOM 1.6

1.000

10.000

Example 7: DR system, phantom comparison

0.010

0.100

0.10 1.00

CDCOMold_1002

CDCOMold_1292

CDCOM1.6_1002

CDCOM1.6_1292

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Evaluation of CDCOM version 1.6

CDCOM has been evaluated extensively

using data from all available systems andphantom comparisons from EUREF,

The search area is in the correct positionin CDCOM version 1.6

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CDCOM version 1.6 was released as beta-

version in September 2011 Potential feedback would be used to

No feedback with incorrect scores or otherbugs have been reported

Since January 1st 2012: CDCOM version1.6-beta has been released as officialversion (version 1.6)