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  Differences Between The Contrast And Non-Contrast CT Scans Area Of Body Contrast CT Scan Non-Contrast CT Scan Head CT Scan Employed for meningeal enhancement, assessment of infection, abscess or tumor for example. Contrast-enhanced head  CT is although much inferior to MRI  for these indications and very less contrast-enhanced head CTs occur. Used in case of stroke, headache, trauma and so on. Most things related to neurology use this technique. Chest Computed Tomography (CT) Employed for testing of the mediastinum (infections and lymph nodes). For evaluating the heart or vascular structures (CT Angiogram for things such as aneurysm, trauma, coronary CT). Utilized for the purpose of Lung parenchymal evaluation, e.g. interstitial lung disease, lung nodules. Abdomen/Pelvis Computed Tomography (CT) Essentially everything else, like, Pancreatitis (essential), for the diffusion of abdominal pain, liver mass, abscess, diverticulitis, etc. Used to find calculi in the ureters or kidneys (the