Additional file 3 of Development and implementation of an ultralow-dose CT protocol for the assessment of cerebrospinal shunts in adult hydrocephalus

Additional file 3: Supplementary Figure 2. ULD CT-Pure IR Permits Evaluation of Lung Parenchyma (a and b) ULD CT-Pure IR (a) and standard dose (b) coronal thoracic CT images demonstrating comparable subjective image quality. Bilateral consolidative change and pleural effusions are clearly appreciated on both studies (c and d). Objective noise (c) and signal to noise ratios (d) for standard and ULD CT-Pure IR images of the thorax and upper abdomen were calculated in the aorta, lung, paraspinal muscle, subcutaneous fat, and liver at the same anatomical level for both studies in a single patient. Data represent the mean and standard deviation. Difference in means was assessed using paired sample t-tests. A p-value < 0.05 was considered statistically significant. SNR Signal to Noise Ratio, NS Not significant (e and f) (e) Anteroposterior chest radiograph and corresponding coronal ULD CT (f) showing a mass lesion (arrow) in the right upper lobe on CT which is poorly appreciated on the plain radiograph. All CT images were reconstructed to a 3 mm slice thickness and visualised using lung windows (window width; 1500 HU, window level; -500 HU).