This page is obsolete: please read the new version.

Calculation of TACs from dynamic PET image

Regions of interest (ROIs)


TACs are calculated in Carimas and saved directly in DFT format (not TXT format). No further conversions are necessary.


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.


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

Program roipxl can be used to retrieve certain pixels inside ROI(s):

"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.

Valid XHTML 1.0 Strict Valid CSS!