|
Table 15. Evaluation
of False Negative Error Rate of the ROI Algorithm
Radionuclide
|
Photon Energy (keV)
|
Equivalent Human Body Burden (c s-1)
|
Typical Human a LC (c s-1)
|
Body Burden relative to LC
|
Observed False Negative Rate (%)
|
|
212Pb
|
2.4E+02
|
6.4E-03
|
8.7E-03
|
0.73
|
68.3
|
|
228Ac
|
8.4E+02
|
4.4E-03
|
1.1E-02
|
0.39
|
87.0
|
|
228Ac
|
9.1E+02
|
5.8E-03
|
1.1E-02
|
0.53
|
63.2
|
|
60Co
|
1.3E+03
|
9.5E-03
|
9.6E-03
|
1.00
|
43.0
|
aTheoretically, if a subject had a body burden
equal to LC, the detection of that radionuclide at LC
would be missed when actually present (false negative) 50% of the time.
The false negative error rate would then increase as the body burden becomes
smaller relative to LC until eventually no activity would
be detected.
|
|
