Table 2.
Summary of patient demographic and morphological parameters as well as CT dose parameters in the two study groups*
| Group SDP | Group LDP | p | |
|---|---|---|---|
| Patients (n) | 51 | 48 | - |
| Male | 16 | 16 | NS |
| Female | 35 | 32 | NS |
| Age (years) | 63.1±14.2 (38.2-89.6) | 59.0±16.7 (25.3-87.7) | 0.26 |
| Dose of 99mTc-MDP (MBq) | 827.8±24.8 (749-877) | 830.0±24.6 (719-870) | 0.45 |
| Abdomen circumference (cm) | 103.5±15.2 (74-142) | 100.2±14.1 (70-130) | 0.29 |
| Abdomen AP diameter (cm) | 24.5±4.3 (17-36) | 23.3±4.1 (15-36) | 0.25 |
| Abdomen lateral diameter (cm) | 37.2±5.4 (27-49) | 36.3±5.5 (27-50) | 0.23 |
| Abdomen surface area (cm2) | 769.4±223.2 (375-1432) | 721.3±202.8 (340-1278) | 0.29 |
| CT dose parameters | |||
| mAs | 64.8±21.6 (35-124) | 43.1±13.6 (22-89) | <0.0001 |
| CTDI (mGy) | 7.0±2.4 (2.7-13.0) | 3±0.9 (1.5-6.0) | <0.0001 |
| DLP (mGy.cm) | 266.9±96.9 (116-535) | 121.5±39.6 (58-215) | <0.0001 |
| Effective dose (mSv) | 4.0±1.5 (1.7-8.0) | 1.8±0.6 (0.9-3.2) | <0.0001 |
*
All values (except patient number, gender and ref mAs) are in mean ± SD with the range in parentheses.
Statistically significant p values are highlighted in bold. AP- Antero-posterior; CTDIvol- Volume CT dose index; DLP- Dose length product.