Which diagnostic imaging is preferred for diagnosing pneumonia?

Chest X-rays are the standard initial diagnostic imaging modality used for diagnosing pneumonia. They are widely available, cost-effective, and provide sufficient detail to visualize the presence of lung infiltrates, which is indicative of pneumonia. The characteristic findings on a chest X-ray, such as areas of opacity or consolidation in the lung fields, can often confirm the diagnosis effectively.

While CT scans can provide more detailed images and are helpful in complicated cases or when there is uncertainty, they are not routinely used as the first line of investigation due to the higher radiation exposure and cost. Chest ultrasounds can assist in evaluating pleural effusions or other complications related to pneumonia, but they are not typically used to diagnose pneumonia directly. MRI of the thorax is seldom utilized for pneumonia diagnosis, as it is not as effective in showing lung pathology compared to X-rays and carries its own limitations in terms of availability and cost. Therefore, the chest X-ray remains the preferred choice for the initial assessment of pneumonia.