Analyze 7.5 image format
A variant (subset) of Analyze 7.5 image format is supported in TPC. Most of the image processing and analysis programs are able to read and write this format.
Image pixel data is stored in .img file, and header contents in .hdr file. Note that ECAT 6.3 images also have the extension *.img, and NIfTI dual file format image files consist of both *.img and *.hdr files.
Analyze files do not contain time information (PET frames). Therefore, corresponding SIF data should always be kept with dynamic Analyze images.
Converting image file formats
Program ImageConverter (contact Timo Laitinen) is available for converting image data between
Analyze 7.5 and other formats. ImageConverter can optionally create SIF.
In TPC, ImageConverter can be started from
elsewhere it can be downloaded from
Additionally, ECAT 6.3 images and ECAT 7 image volumes
can be converted to Analyze 7.5 images using program
ecat2ana, and Analyze 7.5 images can be converted to
ECAT 6.3 images or ECAT 7 image volumes using ana2ecat.
Ecat2ana can create SIF if option
-sif is used.
Analyze 7.5 images can be converted from big endian byte order (Intel PC) to big endian byte order (SUN Sparc, Motorola, PowerPC) and vice versa using anabyteo. Byte order can be set already during conversion with command line options.
Programs ecat2ana and
ana2ecat, and all other programs that can read and write
Analyze 7.5 images, may flip the image in x,y,z-directions by default.
Alternatively, flipping may not be done in z-direction (planes).
The default setting for command-line tools can be seen with program
Image flipping during file conversions can be defined explicitly by using command line option
Editing Analyze 7.5 image headers
Robb RA, Hanson DP, Karwoski RA, Larson AG, Workman EL, Stacy MC. Analyze: a comprehensive, operator-interactive software package for multidimensional medical image display and analysis. Comput Med Imaging Graph. 1989; 13(6): 433–454.
Updated at: 2019-08-21
Created at: 2013-05-07
Written by: Vesa Oikonen