Table 3.
Comparison of Image Quality and Radiation Dose Between Test Groups and Control Group
| Control Group | Test Group A | Test Group B | Test Group C | Test Group D | x2 | p | |
|---|---|---|---|---|---|---|---|
| CT values for the main pulmonary artery | 406.53 (155.00~670.00) | 376.97(252.00~531.00) | 430.03 (211.00~648.00) | 695.82 (403.00~1078.00)* | 600.24 (351.00~1184.00)# | 70.22 | 0.0001 |
| CT values for the S1 segment of the right lung | 370.46 (206.00~90.00) | 378.53 (268.00~550.00) | 361.64 (195.00~662.00) | 557.57 (330.00~811.00)* | 508.38 (264.00~720.00)# | 51.77 | 0.0001 |
| CT values of the S6 segment of the right lung | 288.63 (157.00~480.00) | 336.57† (152.00~557.00) | 295.39 (220.00~590.00) | 394.17 (227.00~637.00)* | 382.45 (152.00~598.00)# | 21.45 | 0.0001 |
| SNR | 70.90 (4.00~215.00) | 36.07 (17.00~58.00)† | 38.21 (9.00~89.00)‡ | 43.75 (19.00~98.00) | 33.10 (13.00~88.00)# | 12.65 | 0.013 |
| CNR | 59.66 (3.00~200.10) | 31.20 (14.00~54.00)† | 32.25 (6.00~78.00)‡ | 38.96 (16.00~89.00) | 28.97 (10.00~78.00)# | 11.79 | 0.019 |
| CTDIvol (mGy)# | 7.99 (7.97~8.00) | 0.92 (0.74~0.95)† | 1.59 (1.59~1.59)‡ | 1.34 (1.11~1.35)* | 1.02 (1.02~1.02)# | 1141.70 | 0.0001 |
| DLP (mGy cm) | 244.82 (181.20~289.20) | 29.81 (18.9.0~35.10)† | 45.94 (34.30~62.00)‡ | 39.22 (30.20~50.50)* | 31.09 (23.90~35.80)# | 119.16 | < 0.0001 |
| ED (mSv) | 3.42 (2.54~4.05) | 0.42 (0.26~0.49) † | 0.64 (0.48~0.87)‡ | 0.55 (0.42~0.71)* | 0.44 (0.33~0.50)# | 119.10 | 0.0001 |
Notes: †Represents a statistically significant difference between test group A and the control group; ‡represents a statistically significant difference between test group B and the control group; *represents a statistically significant difference between test group C and the control group; #represents a statistically significant difference between the test group D and the control group.