Table 2 The technical parameters of CTPA for two groups (A, double low group; B, contrast group).
Group A | Group B | |
|---|---|---|
Dose of contrast agent | 40 ml | 40 ml |
Iodine concentration of Contrast agent | 270 mg I/ml | 350 mg I/ml |
Tube voltage | 80 kVp | 120 kVp |
Tube current | auto | auto |
Noise index | 18 HU | 18 HU |
Pitch | 1.375 | 1.375 |
Slice thickness | 0.625 mm | 0.625 mm |
Tube rotation time | 0.5 s | 0.5 s |
convolution kernel | Standard | Standard |
Reconstruction | 40% ASIR and 60% FBP | 100% FBP |
