ED (in mSv) from Various Components of SPECT/CT MPI Study and Total ED for Entire Procedure
| Component | Male mean ± SD | Female mean ± SD | P |
| ED stress study | 4.6 ± 1.1 | 5.0 ± 1.4 | 0.019 |
| ED rest study | 4.2 ± 1.1 | 5.4 ± 1.4 | <0.001 |
| ED SPECT | 8.8 ± 2.2 | 10.4 ± 2.8 | 0.002 |
| ED CT | 0.8 ± 0.4 | 1.1 ± 0.8 | <0.001 |
| ED total | 9.6 ± 2.2 | 11.5 ± 3.0 | <0.001 |