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A proprietary image format for older CTI PET scanners. We offer limited support for reading ECAT 7 files too.
scaling factors / quantitation:
Each image in the file has two scaling factors depending on which units you prefer for your pixel values. Therefore (X)MedCon knows about two kinds of quantitations:
- quantification [-qs]: one scaling factor will be applied (units = ecat counts)
- calibration [-qc]: both scaling factors will be applied (units = uCi/ml)
Most other formats only have a global or no scaling factor at all (so option [-qc] will guarantee the use of any scaling factor)
patient/slice orientations:
The format does not specify any patient/slice orientation. Which means that supine-headfirst-transverse will be considered as the default orientation.
extra notes:
- Because there is no signature, the ECAT_SYSTEM_TYPE number is used to autodetect the following ECAT6.4 like systems: 831, 911, 931, 933, 951, 953. See the MdcCheckECAT6() function in the m-ecat64.c source file. It is possible to use ECAT 6 as the fallback read format (see [-fb-ecat] option).
- Images are no longer restricted to square dimensions. This can be re-enabled in the file m-ecat64.c by setting:
- The planes sorting is now default set to anatomical (based on slice location). You can sort by frame using the option "-byframe" but beware that this is not an anatomically correct volume anymore.
- These files do not compress well with gzip or compress.
- Unreconstructed or gated studies haven't really been tested with (X)MedCon ... feel free to do so.
Format: CTI ECAT 6/7  
Color Mapgrayscale-
File Endianbiglittle
Pixel TypesVAX Int16 (write) | All (read)float, double
Scaling Factorsquantify & calibrate factors per image are supported
Dimensions / Imagedifferent dimensions for each image are NOT supported
Pixel Types / Imagedifferent pixeltypes for each image are NOT supported

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Page last modified on January 30, 2007, at 12:13 AM