CT · Chest
CT — Pulmonary angiogram (CTPA)
Indication
Suspected acute pulmonary embolism.
Contrast
IV iodinated contrast, ~350–370 mgI/mL at 4–5 mL/s; bolus-tracking on the main pulmonary trunk (~100–150 HU threshold).
Sequences & planes
| Seq. | Plane | |
|---|---|---|
| Volumetric helical | Axial (thin ≤1.5 mm) | arterial phase |
| MPR / MIP | Coronal/Sagittal | reformats |
Planning notes
- Caudocranial acquisition can reduce respiratory motion at the lung bases.
- Assess for right-heart strain (RV/LV ratio) when PE is positive.
References
Educational reference only — verify against current guidelines and adapt to your institution and equipment. Not medical advice.