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As mentioned before unit conversion may take place during data import. For any quantitative PET work you have to make sure that the right input data units are specified if the data is not read from DICOM, ECAT or the database. Activity values are converted to an internal representation, ie. kBq/cc. If the data is saved again, the values after conversion will be stored. Additionally, the acquisition times must also be specified. There is a facility for saving/retrieving timing protocols in all tools which load image data.
The supported units are:
Value String |
Conversion factor applied during reading |
Bq/ml |
0.001 |
cnt/cc |
0.001 |
nCi/cc |
0.037 |
kBq/cc |
1 |
uCi/cc |
37 |
MBq/cc |
1000 |
kcps/cc |
1 |
kcnt/cc |
1 |
kBq |
1 |
ccm |
1 |
m/s |
1 |
% |
1 |
mSUV |
1 |
voxels |
1 |
HU |
1 |
counts |
1 |
centimeter^2 |
1 |
counts/sec |
1 |
mg/min/ml |
1 |
umole/min/ml |
1 |
ml/min/gram |
1 |
ml/gram |
1 |
1/cm |
1 |
umole/ml |
1 |
proportional to counts |
1 |
proportional to counts/sec |
1 |
ml/min/ml |
1 |
ml/ml |
1 |
gram/ml |
1 |
standard deviations |
1 |
LMRGlu |
1 |
LMRGlu umol/min/100g |
1 |
LMRGlu mg/min/100g |
1 |
ml/min/100g |
1 |
1/1 |
1 |
miliseconds |
0.001 |
seconds |
1 |
minutes |
60 |
hours |
3600 |
mm |
1 |
cm |
10 |
m |
100 |