Significance of an additional unenhanced scan in computed tomography angiography of patients with suspected acute aortic syndrome

Figure 5 Density measurements, differences. Density differences between true and false lumen/intramural hematoma (IMH) in arterial, venous and unenhanced phase of (A) thoracic and (B) abdominal aorta. Differences in radiodensity between true lumen and IMH as well as true lumen and thrombosed false lumen, respectively, were only significant in the unenhanced acquisition (P = 0.035). IMH: Intramural hematoma.