[IGSTK-Users] Same TRE for varying target points

[Nathaniel Hamming]

 Hi all,

I'm conducting a study into fiducial configurations and their related TRE. I
used the algorithm presented in igstkLandmark3DRegistrationErrorEstimator to
develop a MATLAB script to calculate the TRE for given image landmarks, FRE,
and a target point. However, when I vary the target point by its x-coodinate
I receive the same TRE for a given fiducial configuration. This is not
experienced when I vary the y- or z-coodinates of the target point. I
validated the MATLAB script with
Landmark3DRegistrationErrorEstimatorExample::ErrorEstimator1 in
IGSTK-Sandbox v2.0 and received the same results.

Has anyone else experienced this situation or can provide enlightenment
for a solution?

Thanks for your time and help,
Nathaniel Hamming

FYI: I included the image landmarks, track landmarks, and target points that
were used to validate the script using
Landmark3DRegistrationErrorEstimatorExample::ErrorEstimator1 along with the
resulting TRE.

*Image Landmarks:*
(0.114845139504747         -84.6604824506397         -6.26710676551675)
(72.9584125146068          6.53918641170636          32.1024344060193)
(-80.5111003508657          4.75960126764604          40.0533742041848)
(58.1672017212154         -47.5649370736371         -12.6361990926914)
(-54.487081424932         -55.2545031775054         -26.0381247399557)
(75.5947613145267          29.6918711527396          11.7797978481002)
(-84.5277722958269          26.1312335752415          12.7930502907778)
(60.4385919682889         -13.0993934111475         -31.2299212457651)
(-65.2827107691361         -21.1801171028438         -34.2503757501768)
(2.04690415405402         -41.7124883445493         -64.6657459246422)
(-73.3214245559623         -19.8518398326938           -3.984626698198)
(69.9212556595938         -1.46702964398868        -0.472367941194386)
(-25.6974808869996          -75.065947078444         -33.4563926906414)
(33.8170959437249         -63.0341849792339         -37.9607564776401)

*Tracker Landmarks:*
(46.600717682397         -30.8121035263332         -885.990194627345)
(128.792976006704          44.5188525815836          -935.56621842578)
(127.021257370086         -107.728230217206         -949.701561980191)
(82.9686506055305          27.1399645537516         -882.972750919913)
(79.6707385764108         -85.7007660779085         -874.429003896307)
(154.517592060753          46.6545433797318         -919.449505921427)
(152.644949852231         -112.921598475625         -926.667845321769)
(120.254718830609          28.8688629954591         -870.901038232264)
(114.048783584512         -96.1666948609119         -872.597788374716)
(98.5072568480499         -30.8629325840406         -835.649463957748)
(110.292486691374         -102.893696403642         -902.229885054371)
(126.40396743689          39.8625678957445         -902.309420522653)
(60.4020948254781         -57.3617285910359         -862.234734609912)
(72.5897769707638          1.66170144246608         -856.570128840823)

*Target Points:*
1 - (-83.5623069243003         -4.91518218770797          32.0031623919239)
2 - (-6.28957965157304         -4.91518218770797          32.0031623919239)
3 - (70.9831476211542         -4.91518218770797          32.0031623919239)
4 - (-6.28957965157304         -104.915182187708          32.0031623919239)
5 - (-6.28957965157304           15.084817812292          32.0031623919239)
6 - (-6.28957965157304           95.084817812292          32.0031623919239)
7 - (-6.28957965157304         -4.91518218770797         -76.1786557898943)
8 - (-6.28957965157304         -4.91518218770797          1.09407148283303)
9 - (-6.28957965157304         -4.91518218770797          78.3667987555603)

*TRE^2 (results from
Landmark3DRegistrationErrorEstimatorExample::ErrorEstimator1) :*
 1 -   0.054657382367051761
2 -   0.054657382367051761
3 -   0.054657382367051761
4 -   0.12959851653502544
5 -   0.070150472712894457
6 -   0.23372722469439022
7 -   0.085080085180609902
8 -   0.033015214490287000
9 -   0.13262218720315677
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/igstk-users/attachments/20080321/e89d428f/attachment.html>