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30 Cards in this Set
- Front
- Back
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what is the hounsfield unit measurement of air
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-1000
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hat is the hounsfield unit measurement of fat
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-120
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what is the hounsfield unit measurement of water
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0
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what is the hounsfield unit measurement of muscle
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40
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what is the hounsfield unit measurement of contrast
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130 and higher
(depends on the contrast barium is much higher) |
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what is the hounsfield unit measurement of bone
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400
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bone window for neck
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350/1800
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What is a good CT angio window for code brain
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200/800
100/800 |
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What is a good window to look for spine disc herniation
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100/400
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Fatty Liver on contrast enhanced study
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When hepatic attenuation numbers are 20 or more Hounsfield units less than the spleen on a post contrast (delayed) scan, a fatty liver can be diagnosed with relative confidence
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Normal liver
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50-70
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Hounsfield liver to spleen
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On a non-contrast when the spleen is more than 10 Hounsfield units brighter than the liver, a fatty liver can be diagnosed with confidence
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Serous Ascites
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-10 to 10
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Exudative ascites
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>15
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ascites with hemorrrhage
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>45
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Hounsfield units of blood
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40
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Active Bleeding
blood |
80-130 HU
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Hemoperitoneum
blood |
35-40HU
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Sentinel Clot
(clotted blood next to adjacent lacerated organ) |
>60
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Gallbladder fluid
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normally less than 20 HU (if more it may be sludge, hemorrhage, pus, or stones)
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Pancreas
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40 HU (approximately equal to muscle)
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Speen
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40-60 HU unenhanced
(5-10 less than liver) |
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Simple Renal Cyst
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-10 to 15 HU
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Adrenal adenoma
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less than 10HU on non-enhanced CT (95% sensitive)
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adrenal myelolipoma
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-30 to -100
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What is the typical HU of a phlegmon
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greater than 20
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What is the typical HU of an abscess
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less than 20
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Acute hemorrhage
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50 to 90 HU and then density will decrease
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CT angiogram chest main pulmonary artery for quality study
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180 hu in the main pulmonary artery
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Hemochromatosis
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75-130HU
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