CT REGISTRY GUARANTEED SUCCESS

CT REGISTRY GUARANTEED SUCCESS how do you reduce beam hardening ️1. Increase dose 2. Reduce collimation--Reduce slice thickness 3. Increase window width At what level does the abdominal aortal bifurcate? ️L4 What is the typical scan delay after injection of contrast media for studies of the liver? ️30-45 seconds What window settings provide the best tissue differentiation within the liver? ️window width= 140, level= 60 What is the window settings that provide the best bone window for the pelvis? ️window width=2000, window level=350 What mAs is typically used in routine CT exams of the abdomen? ️200-300 mAs What is the result of the bifurcation of the abdominal aorta? ️The right and left common iliac arteries What is the anode target angle? ️12 degrees At what level do the common carotids bifurcate into the internal and external carotid arteries? ️C3 C4 The floor of the orbit is formed by the __________ bones. ️maxillary and zygomatic The lateral wall of the orbit is formed by the ___________ bones. ️zygomatic and sphenoid The medial wall of the orbit is formed by the _________ bones. ️ethmoid and lacrimal bones how do you calculate effective mAs? ️mAs/pitch define window level and window width ️LEVEL: a chosen midpoint in the grayscale WIDTH: number of grayscale values above and below the level. - The width is DIVIDED in HALF and distributed above and below the level. - Anything above the window is white - Anything below the window is black The wider the window the more grayscale values, the lower the contrast! example: Level 100, Width 300 White = +250 Black = -50 Level 100, Width 200 White = +200 Black = 0 Level 100, Width 150 White = +175 Black = 25 factors that affect spatial and contrast resolution ️Spatial resolution: