🫁 Chest CT Protocols
Protocols for thoracic imaging including lung parenchyma, mediastinum, and pulmonary vasculature.
Quick Reference
| Clinical Scenario | Key Protocol Features | Contrast |
|---|---|---|
| Pulmonary embolism | Bolus tracking, PA trigger | Yes |
| ILD/fibrosis | HRCT, 1mm slices | No |
| Lung nodule | Thin slices, no contrast | No |
Pulmonary Embolism Protocol
Optimal Timing
- ROI: Main pulmonary artery
- Trigger: 100-150 HU
- Delay: 4-5 seconds
- Direction: Craniocaudal
High-Risk PE Signs
- RV/LV ratio >1.0
- Septal bowing
- IVC reflux
- Bilateral central PE
HRCT Technique
- Slice thickness: 1-1.25 mm
- High-resolution kernel
- Expiratory views for air trapping
- Prone imaging if needed
Dose Optimization
- Use iterative reconstruction
- Low-dose for age < 60
- Ultra Low-dose for nodule follow-up (<1 mSv)