Chest CT Imaging Guidelines

Indications for Contrast-Enhanced Chest CT

The American College of Radiology recommends contrast-enhanced CT for suspected malignancy or mass evaluation, as it significantly improves tissue characterization, lesion detection, and diagnostic accuracy 1.
For malignant pleural mesothelioma, the use of IV contrast (55-100 mL at 2-3 mL/s injection rate) is recommended to improve discrimination of tumor from chest wall, complex fluid, and mediastinal structures 2.
Contrast-enhanced CT is preferred for detecting abscesses, parapneumonic effusions, and empyema, as it provides superior visualization of inflammatory changes and aids drainage planning 1, 4.
The American College of Radiology suggests CTA chest with IV contrast for clinical concern for pulmonary embolism or aortopathy 3.
CT with IV contrast is superior to chest radiography for identifying the etiology and location of bleeding in hemoptysis workup, with localization rates up to 91% 3.
In penetrating thoracic trauma, CTA chest with IV contrast has a negative predictive value up to 99% for triaging and can guide immediate surgical intervention versus expectant management 3.

Contrast improves characterization of masses, particularly distinguishing cystic from solid lesions, and helps map lesion borders 5, 6.
The American Academy of Otolaryngology-Head and Neck Surgery recommends contrast-enhanced CT for better tissue characterization, which provides significantly higher diagnostic confidence for nodal assessment and pleural abnormality evaluation 5, 6.

The American College of Radiology advises against the use of iodinated contrast agents in patients with severe renal insufficiency, as they are potentially nephrotoxic 7, 1.
Documented severe allergy to iodinated contrast is a contraindication to its use 5.
In pregnancy, ultrasound is preferred, and if insufficient, MRI without gadolinium is recommended over CT; however, CT iodine-based contrast is relatively safer in pregnant women compared to MRI gadolinium-based contrast 1, 8.

For typical adult patients without contraindications, the default approach for chest CT should be a contrast-enhanced study with venous-phase timing (60 seconds post-injection) to maximize diagnostic yield 1, 3.
The American College of Radiology recommends non-contrast CT for trauma patients with skeletal injury only 1.
For patients with known severe renal insufficiency or documented contrast allergy, non-contrast MRI or non-contrast CT with understanding of diagnostic limitations should be considered 5, 1.