Regional lung function is emerging as an important factor in thoracic imaging. While chest CT is central to evaluating lung disease, anatomy (structure) alone does not always explain the full clinical challenge. Fortunately, a new generation of CT-based software tools brings regional lung function into the workflow radiologists use every day – chest CT.
Patients with dyspnea, COPD, emphysema, interstitial lung disease, or pulmonary vascular questions can often have symptoms that are difficult to reconcile with structural findings alone.
Radiologists and clinicians assemble the broader clinical picture from multiple sources: CT findings, pulmonary function tests, and nuclear medicine ventilation/perfusion (V/Q) exams.
- Each offers useful information, but each has limits. Pulmonary function tests provide global measures rather than regional detail, while V/Q imaging depends on radiotracer availability, department hours, and nuclear medicine resources.
One example of an emerging technology that provides radiologists with deeper, functional pulmonary detail is CT:VQ from 4DMedical.
- CT:VQ, operating in a Software as a Service (SaaS) mode, uses paired inspiratory and expiratory non-contrast chest CT scans to generate regional ventilation and perfusion maps – along with quantitative outputs designed for radiology workflow.
This approach brings functional lung information closer to the CT reading room without requiring injected contrast or radiotracers for the CT:VQ analysis.
- It also builds on a modality that is widely available and often operational around the clock.
Adding regional ventilation and perfusion information to CT could help address common thoracic imaging questions…
- Which regions are ventilating well, and which are not?
- Is perfusion preserved in areas that look abnormal on CT?
- Do symptoms align with regional functional impairment?
- Which lung regions may be most important to preserve before intervention?
The non-contrast approach has compelling clinical advantages…
- Contrast can trigger renal screening, prior reaction history, IV access challenges, workflow delays, and patient anxiety.
- Avoiding contrast can simplify the pathway for many patients.
CT-based functional imaging is not a replacement for legacy lung function assessments. But it brings quantitative tools that can make routine studies more clinically actionable.
The Takeaway
Technology brings radiologists new opportunities. Chest CT can reveal far more than what the lungs look like. With tools such as CT:VQ, CT can show regional patterns of lung ventilation and perfusion – adding functional context to a radiologist’s toolkit.
More information about CT:VQ and non-contrast functional lung imaging is available at ctvq.com.