Table 2: Student’s paired  was used to compare the two SSDE calculation methods (TG - 204 and TG - 220).

Method

Number of Patients

Mean SSDE (mSv)

Variance of SSDE (mSv)

t - value

p - value

AAPM TG - 204

61

13.60

7.41

 

7.85

 

AAPM TG - 220

61

13.04

6.47