[Insight-users] registration help needed

[soumend at magnum.barc.ernet.in]

 HI!!!
 
 I am facing one peculiar problem in doing MI registration. My code
 registeres
 one CT dataset(3D) with a PET dataset(3D). My problem is the registration
 problem do get completed in WINXP(pro) but in other windows platform like
 win2k,win98 it is giving exception originating from the fact that most of
 the
 point are mapped outside. I tried the same code in RH-LINUX 7.3 and 9 and
 got
 the same exeception. Why this is happenning.......I couldnt find out..plz
 help
 me out.

 I have another query. The result i am getting with CT-PET in WINXP is not
 satisfactory. The images are visibly shifted from one another. I have used
 following parameters.........
 no. of bins - 200, no. of samples - 10000 and
 Optimizer scales [1,1,1,1,1/750,1/750,1/750,1/750] as fixed image dimension
 is
 512X512.
 Optimizer max and min step lengths are 0.1,0.001 resp.
 
 I have tried with diffrent value of these parameters but finally settled in
 this
 set of value. If I want to improve upon more how should I proceed. In this
 regard I one to ask one thing is it feasible to generialize the registration
 process such that user dont have to interact and set parameters for every
 pair
 of image instead the s/w will take care of that.
 
 Lastly I need a suggesion ....If I want to develop a new algo for
 registration
 how sholud I proceed...as I have started reading Information theory and
 satistics a bit and the original paper of Violla. What I mean to ask that
 what
 are the features people look for a good ,fast and robust registration
 process.
 Probably I have not been able to frame the question but that exactly why I
 am
 asking the question.
 
 Thanks for ur patient reading.....hope u will help me out.
 
 Thanx and regards.
 
 Soumen Dey 
 


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