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