Calculation of TACs from dynamic PET image
Regions of interest (ROIs)
Carimas
TACs are calculated in Carimas and saved directly in DFT format (not TXT format). No further conversions are necessary.
Imadeus
TACs are calculated in Imadeus and saved directly in DFT format. No further conversions are necessary.
TACs can be calculated from Imadeus ROIs also in Carimas 2.x.
If dynamic Analyze image is too large for Carimas, then convert
it first into ECAT 7 format using
ana2ecat with option
-flip=n, and make sure that appropriately named
SIF is in the same folder as the Analyze .img and .hdr
files.
Vinci
TACs are calculated in Vinci, and saved in CPT format. These can be converted to our standard DFT format using cpt2dft.
Imagetool and YaIT
After the regions-of-interest (ROIs) have been drawn to MRI or PET sum image, the TACs can be calculated in the command prompt windows in PC/Windows or Sun/Solaris using img2dft. PET image must be calibrated and decay corrected to the injection time before calculation of TACs.
When using img2dft, specific options are available to
- calculate TACs from different image planes than they were drawn in,
- calculate SD inside ROIs
Program roipxl can be used to retrieve certain pixels inside ROI(s):
- TACs of separate pixel inside ROI(s)
- TAC of pixel inside ROI(s)
with the highest peak value: option
-mp - TAC of pixel inside ROI(s) with
the highest AUC: option
-ma - TAC constructed of maximum pixel
values inside ROI(s) in each frame: option
-mf
"Head" curve
To produce a TAC containing the average of all pixels in an image or sinogram ("head" curve), program ecathead can be used instead.
TAC of certain pixel
TACs of single pixel(s) in PET image or sinogram specified by column, rowand plane can be extracted with epxl2dft.
Polar maps
Dynamic or parametric polar map can be converted to/from DFT file using programs pm2dft and dft2pm.
