The main non-invasive imaging techniques for extravascular lung water
| Imaging techniques | Chest X-ray | Chest CT | CMR | PET-SPECT | LU |
|---|---|---|---|---|---|
| Relative cost | 1 | 10 | 20 | 100 | 1 |
| Radiation | 1 | 200 | 0 | 250–500 | 0 |
| CO2 (kg) | 1 | 20 | 50 | 20–30 | 1 |
| Bedside | Yes | No | No | No | Yes |
CMR: cardiovascular magnetic resonance; CT: computed tomography; LU: lung ultrasound; PET: positron emission tomography; SPECT: single-photon emission tomography. Radiation is expressed in multiples of chest X-ray (postero-anterior projection)