[MINC-users] MINC -> Analyze conversion problem

[Christophe Grova]

Hello Andrew,

> Did you by any chance convert the file to analyze on an SGI and then view
the
> resulting analyse header on a linux box?

No, everything was made on my linux box. Dale Einarson installed on my
machine all usual softwares or the BIC.
So I used Display and mnc2ana on my linux box.


>
> try running the conversion as such (on the SGI):
>
>    $ mnc2ana -verbose file.mnc out.hdr

I did not manage to access this function on SGI as feeble or bullcalf :o(
Here is the result of the verbose ...and evreything seems to be OK:
The analyze dump I used last time was obtained using a software that I
obtained on the Mayo clinic website via information found in the help of SPM
(but they have changed their website since :o()  . I obtained the same wrong
information using my dump software or when I open this analyze file with
SPM. I also obtained wrong info using ana_show (see the second dump below)

Any ideas ??? Thanks in advance,

Christophe




Start:  62.690799713134801152  - 139.53522491455080967  -
115.46477508544920454
Step:   -0.99999999999999877875  - -1  - -1
Length: 170 - 256 - 256
Dims:   xspace - zspace - yspace
HDR:
 sizeof_hdr     <348>
 data_type      <0>
 db_name        <>
 extents        <16384>
 session_error  <0>
 regular        <r>
 hkey_un0       <0>
DIMENSION:
 dim:           <4 170 256 256 0 0 0 0>
 vox_units      <>
 cal_units      <>
 unused1        <0>
 datatype       <4>
 bitpix         <16>
 dim_un0        <0>
 pixdim         <4 0.999999999999999 1 1 0 0 0 0>
 vox_offset     <0>
 scale_factor   <1>
 funused1       <0>
 funused2       <0>
 cal_max        <0>
 cal_min        <0>
 compressed     <0>
 verified       <0>
 glmax          <65535>
 glmin          <0>
HISTORY:
 descrip        <>
 aux_file       <>
 orient         <0>
 originator     <0 0 0 0 0>
 generated      <>
 scannum        <>
 patient_id     <>
 exp_date       <>
 exp_time       <>
 hist_un0       <>
 views          <0>
 vols_added     <0>
 start_field    <0>
 field_skip     <0>
 omax           <0>
 omin           <0>
 smax           <0>
 smin           <0>

mincextract -normalize -positive_direction -filetype -signed
calistus_rukshan_20010724_1_2_mri.mnc >
calistus_rukshan_20010724_1_2_mri.img


>
> This should provide a dump of the analyze header as it is created.
> either that or use the C/L tool 'ana_show out.hdr' on the SGI or at least
where
> you run mnc2ana.
>


I tried this function (still on my linux box) ...and obtained this wrong
information this time (both mnc2ana and ana_show were performed on my linux
box, so it should not be a pb of byte swapping)....here is the result of
ana_show:

HDR:
 sizeof_hdr     <348>
 data_type      <0>
 db_name        <>
 extents        <16384>
 session_error  <0>
 regular        <r>
 hkey_un0       <0>
DIMENSION:
 dim:           <4 -21822 0 1 1 0 0 0>
 vox_units      <>
 cal_units      <>
 unused1        <0>
 datatype       <1024>
 bitpix         <4096>
 dim_un0        <0>
 pixdim         <-32 2.31382402429314e-41 5.83182585793452e-39
1.00592041015625 -1.78160862546503e-38 8.82818032524635e-44 0 0>
 vox_offset     <0>
 scale_factor   <0>
 funused1       <-32>
 funused2       <2.27795078360642e-41>
 cal_max        <0>
 cal_min        <0>
 compressed     <0>
 verified       <0>
 glmax          <0>
 glmin          <-1077739520>
HISTORY:
 descrip        <>
 aux_file       <>
 orient         <0>
 originator     <0 0 0 0 0>
 generated      <>
 scannum        <>
 patient_id     <>
 exp_date       <>
 exp_time       <>
 hist_un0       <>
 views          <0>
 vols_added     <0>
 start_field    <0>
 field_skip     <0>
 omax           <0>
 omin           <0>
 smax           <0>
 smin           <0>