From anthonin at biospective.com Fri Feb 19 17:22:47 2010 From: anthonin at biospective.com (Anthonin Reilhac) Date: Fri, 19 Feb 2010 17:22:47 -0500 Subject: [MINC-development] minctracc error Message-ID: <44da421f1002191422jaa70281k7cf5382d359ba1@mail.gmail.com> Hello, I am currently experiencing issues with minctracc which crashes and outputs this error: *Error in /usr/local/bic/bin/minctracc in file init_params.c, line 593 Cannot calculate the COG or COV of volume 1.* infos: *a)* The two volumes I am trying to align are 2D sections (written as 3D volumes z->length = 1). *Source:* image dimensions: xspace yspace zspace dimension name length step start -------------- ------ ---- ----- xspace 6720 0.0016 1.9464 yspace 8544 0.0016 6.6568 zspace 1 0.1 0 *Target:* dimension name length step start -------------- ------ ---- ----- xspace 7520 0.0016 1.0248 yspace 8128 0.0016 7.3224 zspace 1 0.1 0 *b)* mincstats -com -world_only gives me correct COG values. *Source*: CoM_real(x,y,z): 7.42142568 13.35683104 0 *Target*: CoM_real(x,y,z): 8.261485204 10.00648279 0 *c)* if I downsample enough both volumes (0.02 mm) using autocrop, I can get minctracc working without crashing: *Source:* dimension name length step start -------------- ------ ---- ----- xspace 538 0.02 1.9464 yspace 684 0.02 6.6568 zspace 1 0.1 0 *Target:* dimension name length step start -------------- ------ ---- ----- xspace 646 0.02 1.0248 yspace 748 0.02 2.9704 zspace 1 0.1 0 minctracc gives: *Source*: COG of v1: 5.848002 12.464701 0.000000 *Target:* COG of v2: 11.014800 10.345677 0.000000 [trans] = 5.166798 -2.119023 0.000000 But the COG values are not correct. For comparison, *mincstats -com -world_only* on the downsampled volumes gives the following values which are not different from when computed in point b. *Source:* CoM_real(x,y,z): 7.42070981 13.35900666 0 *Target:* CoM_real(x,y,z): 8.259952437 10.00411748 0 *d)* If I donwsample further (0.1 mm)*, *the discrepancies between the COG values computed with mincstats & minctracc decrease slightly. * Source:* dimension name length step start -------------- ------ ---- ----- xspace 108 0.1 1.9464 yspace 137 0.1 6.6568 zspace 1 0.1 0 *Target: * dimension name length step start -------------- ------ ---- ----- xspace 130 0.1 1.0248 yspace 150 0.1 2.9704 zspace 1 0.1 0 *minctracc gives: Source:* COG of v1: 6.783619 12.909432 0.000000 *Target:* COG of v2: 10.974800 10.455488 0.000000 [trans] = 4.191181 -2.453944 0.000000 * mincstats still gives the "same" values as in b) and c):* *Source*: CoM_real(x,y,z): 7.426436221 13.35572188 0 *Target:* CoM_real(x,y,z): 8.267742651 9.998513526 0 Am I hitting at a limit of minctracc here? Any clue? Thanks in advance. Anthonin -------------- next part -------------- An HTML attachment was scrubbed... URL: