Skip to content

🫁 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)