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This page is maintained by
Mark Cohen [updated 4.16.02]
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or just type:
and wait for the filename prompt
ImageInfo currently recognizes Signa genesis, analyze, bshort, buchar, bfloat and APD data types, and will summarize the headers for each. Since not all image types have the same depth of header information (see file formats page for more detail), the display will differ for each data type, as shown below.
The source is now available for ImageInfo.c
Examples:
% ImageInfo Analyze.img Image file type: Analyze Byte Order: Big Endian (like a Macintosh) ---------------------------------------- Header name .............. Analyze.hdr Date/time (?)............. Thu Jan 8 20:28:35 1998 Scan description ......... EPI Data ---------------------------------------- Resolution (x / y) ....... 3.125 x 3.125 mm Display FoV (x / y) ...... 400 / 400 mm Display Pixels (x / y) ... 3.125 / 3.125 mm Display matrix ........... 128 x 128 pixels Slice thickness .......... 5.00 Slice spacing ............ 5.00 Number of slices ......... 16 Time Points .............. 1 File data type ........... unsigned short Echo ..................... 1 of 1 Pixel min/max ............ -2147483648.00 / 2147483648.00 Show all Analyze header fields (y/n)?: n ---> (Note, entering y shows more detail) <--- |
Please note that the Analyze format does not actually include the tr in the standard specification. By convention, adopted from fsl and spm, the tr is placed in one of the less used data fields. Note also, that here at UCLA, I have re-used one of the header fields to convey other information about cropping and interpolation. At present, this is not displayed by ImageInfo. The range for Pixel min/max is actually calculated, when the data are brought in using imconvert. Otherwise, ImageInfo simplyu states what is in the header. Most of the tools I have seen for Analyze format images do not enter these data correctly.
% ImageInfo Visual.bshort Image file type: MGH bshort Byte Order: Big Endian (like a Macintosh) ---------------------------------------- Header name .............. Visual.hdr Date/time (?)............. Tue Apr 30 18:30:01 2002 ---------------------------------------- Resolution (x / y) ....... 3.125 x 3.125 mm Display FoV (x / y) ...... 200 / 200 mm Display Pixels (x / y) ... 3.125 / 3.125 mm Display matrix ........... 64 x 64 pixels Slice thickness .......... 4.00 Slice spacing ............ 0.00 Number of slices ......... 1 Time Points .............. 75 File data type ........... unsigned short TR ....................... 2500.0 msec Echo ..................... 1 of 1 |
The MGH format does not actually include the tr, FoV, resolution, thickness,slice spacing or even the number of slices. ImageInfo and imconvert make a guess.
% ImageInfo E2174S4I92.MR Image file type: Signa Genesis Byte Order: Big Endian (like a Macintosh) ---------------------------------------- Exam number .............. 2174 Series number ............ 4 Image number ............. 92 Date/time (?)............. Wed Mar 1 15:45:00 2000 Scan duration ............ 11:44.20 min Subject Name ............. 1038 Patient ID ............... 1038 Age ...................... 33 years Sex ...................... Female or not specified Weight ................... 162.7 pounds Scan description ......... ICBM-1999 Hospital Name ............ UCLA Brain Mapping Field strength ........... 3.00 Tesla ---------------------------------------- pulse sequence name ...... newfse acq matrix ............... 256 x 256 Resolution (x / y) ....... 0.859 x 0.859 mm Display FoV (x / y) ...... 220 / 220 mm Display Pixels (x / y) ... 0.859 / 0.859 mm Display matrix ........... 256 x 256 pixels Slice thickness .......... 2.00 Slice spacing ............ 0.00 Top left RAS coords ...... -22.80 110.00 122.80 Top right RAS coords ..... -22.80 -110.00 122.80 Bottom right RAS coords .. -22.80 -110.00 -97.20 Normal RAS coords ........ 1.00 0.00 0.00 Number of slices ......... 1 Time Points .............. 1 File data type ........... unsigned short TR ....................... 5500.0 msec TE ....................... 85.00 msec nex ...................... 1.0 acquisitions ............. -13107 Flip Angle ............... 90 degrees Acquisition bandwidth .... 16.000 kiloHertz Echo ..................... 2 of 2 Echo train length ........ 8 Transmitter gain ......... 131 Receiver gain (1) ........ 6 Receiver gain (2) ........ 29 Pixel min/max ............ 0.00 / 687.00 |
There are many more data fields in the Signa header than are displayed by ImageInfo. Interested users could modify the program to list more infomation. The data/time field is not always correct, as the different computers that are the source of these images have differing conventions on how this is stored.
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This page is maintained by
Mark Cohen [updated 4.16.02]
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