medcon - MedCon conversion of medical image formats

medcon [options] -f files ...

MedCon is a conversion utility intended for reconstructed nuclear medical images.

The supported formats are:

center,tab(@); c c s s s c c c s s s c l l s s s l. Format@Explanation@Notation ------@-----------@-------- Ascii@Raw ascii image arrays without header@'ascii' Binary@Raw binary image arrays without header@'bin' Gif89a@annimated GIF with colormap@'gif' Acr/Nema@Papyrus, Siemens (vers 2.0)@'acr' INW@RUG local format (vers 1.0)@'inw' ECAT@Siemens CTI ECAT 6@'ecat' InterFile@version 3.3@'intf' Analyze@with consideration to SPM software@'anlz' DICOM@uses the VT-DICOM library@'dicom' PNG@Portable Network Graphics@'png' Concorde@Concorde/microPET@'conc'

-f, --file, --files <files> ...

Read a list of files.

-8, --indexed-color

This color mode forces 24-bit RGB color images being reduced to an 8-bit indexed colormap. For color reduction in combination with dithering see the -dith option.

-24, --true-color

This color mode keeps a 24-bit image as is.

-alias, --alias-naming

Generate filenames based on patient and study information. The syntax of the resulting basename is:

<patient_name>+<study_id>+<study_date>+<study_time> and <series>+<acquisition>+<instance>

with the latter three id's applied in case the originating format is DICOM or Acr/Nema. See also -noprefix. Since Analyze does not have a patient_name, patient_id is used instead.

-anon, --anonymous

Make patient and study related entries anonymous (filled with 'X'). This option can not be used with option -ident.

-b8, --unsigned-char

-b16, --signed-short

-b16.12

Force writing of Uint8 or Int16 pixels. The special option -b16.12 only uses 12 bits, as unsigned however. With these options one can lose the quantified float values when the new format doesn't support a global rescale factor or slope/intercept.

-big, --big-endian

Force writing of big endian files when supported by the format.

-byframe, --sort-by-frame

Set sort order in ECAT by frames, instead of the default anatomical sort (based on slice location). Identical planes in each frame will be grouped together. You don't want this.

-c, --convert <format> ...

Convert with a list of formats to convert to. Use the notation without quotes as specified in the above table. You can not use this option with -p.

-contrast, --enable-contrast

Apply (DICOM) window centre/width contrast remapping. Although this may improve the display of images, any manufacturer independent pixel values (like HU, SUV) with quantitation options -qc or -qs will be lost.

-cor, --coronal

Reslice the images of a volume into a coronal projection while preserving the real world dimensions.

-crop=<X>:<Y>:<W>:<H>, --crop-images=<X>:<Y>:<W>:<H>

This option allows to crop an equal frame from all images at <X>:<Y> where width and height are <W>:<H>. The upper-left corner of an image is at 0:0.

-cs, --cine-sorting

Apply cine sorting, 1st image of each time frame, 2nd image of each time frame, 3rd image of each time frame, ... (applicable on gated SPECT). Reapplying does NOT undo this sorting. For this you need option -cu.

-cu, --cine-undo

Undo the cine sorting (as a result of the option -cs).

-cw=<centre>:<width>

Remap contrast using specified centre/width pair. No spaces are allowed within this option. See also -contrast options.

-d, --debug

Show debug info. After reading a file, the program will display the contents of the internal FILEINFO structure.

-dith, --dither-color

Use dithering to improve quality of color reduction (from RGB to 8-bit indexed).

-e, --extract [image ranges ...]

A routine to extract images interactively, unless you specify normal style image ranges directly on the command-line separated by spaces. In normal style it is also possible to reorder the sequence of images. You need to specify an output conversion format (see option -c). Note that the extraction does NOT addapt the centre-centre slice separations. In other words, proper volume measurements could be lost.

Selection Type? 1=normal 2=ecat

Normal Style ------------

- Any number must be one-based (0 = All reversed) - Syntax of range : X...Y or X-Y - Syntax of interval: X:S:Y (S = step) - The list is sequence sensitive!

Give a list of images to extract?

Ecat Style ----------

- Any number must be one-based (0 = All) - Syntax of range : X...Y or X-Y - Syntax of interval: X:S:Y (S = step)

Give planes list? Give frames list? Give gates list? Give beds list?

-ean, --echo-alias-name

A convenience function which quickly echoes the alias or human readable filename on screen, without any delay of image processing. For the syntax of this alias filename, see option -alias. The output could then be used in a script, for example to make interpretable links towards cryptic numbered files resulting from a DICOM series.

-fb-none, --without-fallback

-fb-anlz, --fallback-analyze

-fb-conc, --fallback-concorde

-fb-dicom, --fallback-dicom

-fb-ecat, --fallback-ecat

Disable or specify a fallback read format in case autodetect failed.

-fh, --flip-horizontal

-fv, --flip-vertical

Flip images horizontal (-fh) along the X-axis, vertical (-fv) along the Y-axis respectively. Parameters such as slice orientation are NOT changed. See also the -rs option.

-fmosaic=<W>x<H>x<N>, --force-mosaic=<W>x<H>x<N>

Enforce the mosaic file support for DICOM or Acr/Nema formats. The *stamps* will be splitted into separate slices according to the values supplied on the command-line. See also extra options -interl and -mfixv. The preset arguments are:

<W> = pixel width of image stamps (X)

<H> = pixel height of image stamps (Y)

<N> = total number of image stamps (Z)

medcon -f imagefile -fmosaic=64x64x30

-g, --make-gray

Remap coloured images to gray. This is necessary when you convert to formats which only support a grayscale colormap!

-gap, --spacing-true-gap

The spacing between slices is the true gap/overlap between adjacent slices. In contrary to the default behaviour where the spacing between slices is measured from the centre to centre of two adjacent slices (including gap/overlap). Applied in DICOM & Acr/Nema.

-hackacr, --hack-acrtags

Enables you to hack a file that contains Acr/Nema tags hidden somewhere. Some proprietary image formats do contain tags but are placed after some unknown headerinformation. This option will try to find some readable tags in the first 2048 bytes after which it will give some possible hints to get the images out of the file with the use of the interactive reading procedure (see option `-i'). This experimental procedure can fail badly ...

-i, --interactive

Selects the interactive reading procedure. Normally the program automatically detects the format or uses 'ecat' (or 'dicom') as default. With the interactive procedure it could be possible to read an uncompressed, unsupported format by answering the following questions:

Number of images? General header offset to binary data? Image header offset to binary data? Image header repeated before each image? Swap the pixel bytes? Same characteristics for all images? Absolute offset in bytes? (overrides above, 0 = unused) Image columns? Image rows? Pixel data type? Redo input?

The GUI allows to save such raw predef input (RPI) files, that can be used in a redirect statement:

medcon -f unsupported.img -c intf -i < predef.rpi

Doing so you can create small scripts that will read and convert your unsupported images at once.

-ident, --identify

An interactive routine to specify the patient and study related information. This option can not be used with the option -anon. The questions asked are:

Give patient name? Give patient id? Select patient sex? Give study description? Give study id/name/p-number? Give series description?

-implicit, --write-implicit

Another DICOM related option to enforce the implicit VR little transfer syntax as output, instead of the default explicit transfer syntax.

-interl, --mosaic-interlaced

An extra option used in combination with forced mosaic (-fmosaic). The option indicates that the slices in the original mosaic are in fact interlaced. See also options -fmosaic and -mfixv.

-little, --little-endian

Force writing of little endian files when supported by the format.

-lut, --load-lut <filename>

Load an external LUT color scheme.

-mh, --map-hotmetal

Selects the hotmetal colormap. This is only usefull to GIF89a or PNG.

-mr, --map-rainbow

Selects the rainbow colormap. This is only usefull to GIF89a or PNG.

-mc, --map-combined

Selects the combined colormap. This is only usefull to GIF89a or PNG.

-mi, --map-inverted

Selects the invers colormap. This is only usefull to GIF89a or PNG

-mfixv, --mosaic-fix-voxel

Another extra option used in combination with forced mosaic (-fmosaic). Choosing this options will rescale the real world voxel dimensions by the mosaic factor. See also -fmosaic and -interl.

-mosaic, --enable-mosaic

Enable mosaic file support in DICOM or Acr/Nema format. The *stamps* will be splitted into separate slices according to values found in the file. This autodetect routine will always fix the voxel sizes. To support other type of mosaic files, see option -fmosaic.

-n, --negatives

Preserve negative values. When not selected, all negative values are put to zero. In combination with quantitation (see -qs or -qc) the requested format must support pixels of type float, a global rescale factor or the more generic slope/intercept concept in order to preserve the (negative and positive) quantified values.

-nf, --norm-over-frames

Normalize with minimum/maximum values found over images in a frame group (in case the original format has different frames). The default behaviour is normalization with minimum/maximum values found over all images. This can be important when the requested format requires a rescaling to a new pixeltype. The original pixel values then need to be rescaled to the new pixeltype boundaries based on the minimum/maximum values.

-nometa, --write-without-meta

Write DICOM files without the part 10 meta header (group 0x0002).

-nopath, --ignore-path

Ignore absolute path mentioned in the "name of data file" key of an interfile header. Do make sure then that the data file resides in the same directory as the header file.

-noprefix, --without-prefix

This option disables the numbered prefix in the output filename. In combination with the -alias option, one could create human readable and alphabetical sorted files from DICOM or Acr/Name multiple file volumes.

-o, --output-name <filename>

Changes output filename for ALL files to be created. It is allowed to specify a full directory path as well. However, a full path disables unique filename prefixing.

-one, --single-file

Write header and image to same file; as allowed for InterFile.

-optgif, --options-gif

Define some GIF options when converting to the GIF format. Without this option a loop and background color are defined by default. This interactive routine asks the following questions:

Select color map? Insert a display loop? Delay 1/100ths of a second? Insert a transparent color? Transparent color? Background color?

-optspm, --options-spm

Define some SPM options (origins) when converting to the Analyze format. The quantification is not set. See also '-spm' & '-ar'. The interactive routine asks the following questions:

Origin X? Origin Y? Origin Z?

-p, --print-values

Show some specified pixel values. This is an interactive routine. Calibration and negative pixels are preserved automatically. You need to specify the -qs to preserve the quantification instead of the calibration. You can not use this option with -c. See also -pa option for a non-interactive routine.

- Any number must be one-based (0 = All) - Syntax of range : X...Y or X-Y - Syntax of interval: X:S:Y (S = step)

Selection Type? 1=normal 2=ecat

Normal Style ------------

Give a list of image numbers? Give a list of pixels x,y ?

Ecat Style ----------

Give planes list? Give frames list? Give gates list? Give beds list? Give a list of pixels x,y ?

-pa, --print-all-values

Show all pixel values. This option is identical to -p, but doesn't require user input.

-pad, --pad-around

-padtl, --pad-top-left

-padbr, --pad-bottom-right

Increasing the slice matrix is done by padding an image with the lowest pixel value. The options above enable different padding modes.

-preacq, --prefix-acquisition

-preser, --prefix-series

Respectivily use acquisition or series value in the numbered prefix of the new filename. This is useful for alphabetical file ordering, where leading zeros in DICOM elements are missing. See also -alias.

-q, --quantitation

Enable quantitation using all scale factors (for now alias for -qc option).

-qs, --quantification

A first scaling option to preserve the (ECAT) quantification (a) or to consider a first linear scaling slope with intercept (b).

qpv = ppv * quant_scale [counts/second/pixel] (a) qpv = ppv * slope + intercept (b)

qpv = quantified pixel value ppv = plain pixel value

The "quant_scale" factor normalizes all images in the file; quite important for merging purposes. When the corresponding format can not hold a rescale factor for each image, the quantified values are saved as floats. Therefore, the highest pixel precision for correct quantitation is float, not double!

If the format does not support floats, the quantified pixel values get rescaled to an integer. Then only formats that support a global scaling factor or slope/intercept pair will preserve those quantified values.

Note that this option can not be used with -qc.

-qc, --calibration

A second quantitation option to preserve the (ECAT) quantification as well as the (ECAT) calibration (a) or in general, using two rescale slopes with an intercept (b). These should normally transform pixels into manufacturer independent values. So one can assume that after a calibration, the new pixels will represent a real world unit (like concentration values (SUV), hounsfield units (HU) and alike).

cpv = ppv * quant_scale * calibr_fctr [uCi/ml] (a) cpv = ppv * slope1 * slope2 + intercept (b)

cpv = calibrated pixel value ppv = plain pixel value qpv = quantified pixel value = ppv * quant_scale

The "quant_scale" factor normalizes all images in the file; quite important for merging purposes. The "calibr_fctr" rescales the qpv-values to a new unit. When the corresponding format can not hold a compound factor for each image, the quantified values will be saved as floats. Therefore, the highest pixel precision for correct quantitation is float and not double!

If the format does not support floats, the calibrated pixel values are rescaled to an integer type. Only formats that support a global scaling factor or slope/intercept pair preserve those calibrated values.

Note that this option can not be used with -qs.

-r, --rename-file

Rename the file basename. This option is only useful in case of conversion.

-rs, --reverse-slices

Reverse all the slices along the Z-axis. Parameters such as slice orientation are NOT changed. See also the -fh and -fv options.

-s, --silent

Suppress all message, warning and error dialogs.

-sag, --sagittal

Reslice the images of a volume into a sagittal projection while preserving the real world dimensions.

-si=<slope>:<intercept>

Force remap of pixel values using specified slope/intercept (y = s*x + i). The quantitation option -qc is enabled by default. No spaces are allowed within this option.

-skip1, --skip-preview-slice

Skip the first image in an InterFile. In other words, the first image in the array will simply be ignored. Use this only when you are sure that the InterFile does contain an annoying/confusing preview slice.

-split4d, -splitf, --split-frames

-split3d, -splits, --split-slices

Write out a study into separate files, one for each volume in a time frame (--split-frames) or each image slice (--split-slices) individually. The names of the files created will have an extra index number. See also -stack3d and -stack4d as opposite options.

-spm, --analyze-spm

Considering Analyze files for/from SPM. In this case the global scaling factor hidden in imd.funused[1] will be used, as well as the hidden offset value in imd.funused[0].

In case of quantitation, the default output pixel type is float. This option allows to write integers combined with a global scale factor. To actually use this scaling factor, you must select a quantitation option like -qs or -qc as well.

See also -ar & -optspm.

-sqr, --make-square

Make all image matrices square, using the largest dimension. Images are padded with the lowest pixel value. See also -pad related options.

-sqr2, --make-square-two

Make all image matrices square, using the nearest power of two (between 64, 128, 256, 512 and 1024). Images are padded with the lowest pixel value. See also -pad related options.

-stack4d, -stackf, --stack-frames

-stack3d, -stacks, --stack-slices

Write separate studies into one file. The --stack-slices option allows to write single image slice files into one 3D volume, while the --stack-frames option allows volumes of different time frames being written into one 4D file. The sequence of stacking is based on the file sequence given at the argument line. See also -split3d and -split4d as the opposite options.

-tra, --transverse

Reslice the images of a volume into a transverse projection while preserving the real world dimensions.

-uin, --use-institution-name <namestring>

Change the program's default institution name which is applied on studies without one. However, this does not override existing values. For a namestring with spaces, group between double quotes.

-v, --verbose

Verbose mode. Show some explaining messages during the reading and writing of files.

-vifi, --edit-fileinfo

An interactive routine for editing voxel,array,slice and orient related entries in the FILEINFO struct.

-w, --overwrite-files

Allow overwrite of existing files, without warning.

When no conversion was specified, the program will display the header information of each image.

When conversion was specified, the program will automatically create new filenames in the current directory with the following syntax:

mXXX-filename.ext

`XXX-' a number representing the XXX-th conversion

`ext' a corresponding extension of the new format

center,tab(@); l c l. Binary raw@->@.bin Ascii raw@->@.asc Gif89a@->@.gif Acr/Nema@->@.ima INW@->@.im ECAT@->@.img Interfile@->@.h33 + .i33 Analyze@->@.hdr + .img DICOM@->@.dcm PNG@->@.png CONC@->@.hdr + .dat

Some special remarks related to reading from stdin or writing to stdout.

a) reading from stdin:

Enable this by using an "-" mark instead of the list of input files.

1. redirect: medcon -f - < inputfile

This is supported for all formats and shouldn't cause any particular problems. Interactive routines are disabled because stdin is now in use by the image input.

2. pipes : cat inputfile | medcon -f - format

Actually, this way only one or two formats are supported since seek() calls are not possible during pipes. The fact is that most of our formats are read using those seek() calls. In normal operation we already need a quick sneak in the file to determine the format. Because this fseek() isn't allowed, you must supply at least the input format too.

b) writing to stdout:

Enabled by using an extra "-" mark on the conversion list.

medcon -f inputfile -c - format

Only one inputfile is allowed. The converted output will be send to stdout.

In case of dual file formats such as Analyze or InterFile, the header information will be send to stderr. The reference to the image file in the header of an InterFile will ofcourse be wrong (since the program is not capable of knowing the resulting filename).

In case of RAW or ASCII output, the program will print the content of the internal FILEINFO struct to stderr as well. Please note that the (t)csh shells do not allow to catch stderr or stdout separately. In case of the bash shell, it is possible to say:

medcon -f inputfile -c - intf -b16.12 -qc 1>image 2>header

1. To display the image headers: medcon -f filename1 filename2

2. To convert the images: medcon -f filename1 filename2 -c gif acr intf

3. To read interactively: medcon -i -f filename -c ecat

4. To extract alternate images: medcon -e 1:2:20 -f filename -c gif

5. To print out pixel values medcon -p -f filename

6. Send raw images to standard output: medcon -f filename -c - bin

tab(@); l l. /usr/local/xmedcon/include/@Directory with header files. /usr/local/xmedcon/lib/@Directory with libraries. /usr/local/xmedcon/bin/@Directory with executables. /usr/local/xmedcon/man/@Directory with man-pages. /usr/local/xmedcon/etc/@Directory with rcfiles.

xmedcon(1), xmedcon-config(1)

m-acr(4), m-anlz(4), m-gif(4), m-inw(4), m-intf(4), m-ecat(4)

medcon(3)

(X)MedCon project was written by Erik Nolf (eNlf) for the PET-Centre at Ghent University (Belgium).

tab(=); lB l lB l. e-mail:=enlf-at-users.sourceforge.net=www:=http://xmedcon.sourceforge.net