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Terms in this set (50)
In plain radiography the brightness depends on?
Describe the relationship between attenuation and density of x-rays?
High density structures attenuate (block) incoming x-rays
High density (attenuating) structures appear to be what color on X-ray?
Low density (low attenuating) structures appear what color on x-rays?
Opacity also means?
Lucency also means?
What are 3 examples of low attenuating, low density lucent structures on X-ray?
What is the order from lowest density (low attenuating) to highest density (high attenuating) for:
1. Air (A)
2. Fat (B)
3. Soft tissue (C)
4. bone (D)
5. metal (E)
In order to see a difference on X-ray there must be a difference in what?
What is a Silhouette sign?
a previous distinct border has been lossed
In the lateral view of X-ray the X-rays pass through which side of the pt?
From the right to the left to the detector or film
What are the 2 views involved in two-view examination x-ray?
What is used for the 1 view examination for X-ray?
Structures that are closest to the source or film undergo magnification in X-ray?
Because of the magnification feature of x-rays, which view will make the heart appear larger?
Which view is better; 2 view or single view?
Silhouettes appear due to differences in?
Decubitus views are described based upon which side of the body is down/up?
It is best to detect free air by silhouettes against which 2 structures?
What are the 3 views obtained in an acute abdominal series?
1. AP upright abdomen
2. AP supine abdomen
3. AP upright chest
The left lateral decubitus view of the abdomen is mainly used in pts who?
High density structures appear what color on CT? Low density?
High density: white
Low density: black
What is the order from least attenuating (black) to most attenuating (white) for CT?
3. Simple fluid
4. Soft tissue/blood/complex fluid
Low density structures are hypoattenuating or hyper? High density? CT
Low density: hypoattenuating
High density: hyperattenuating
What are examples of positive contrast?
What is the difference between positive and negative contrast material?
Positive contain metallic elements and negative is more like air and water
Contrast is equivalent to which density structure in CT?
What bone structure is shown? Where are we located?
Glenoid cavity and humeral head; apices of chest
Which structure lies right behind the sternum?
left brachiocephalic vein (you can also see the left common carotid, left subclavian and brachiocephalic artery
what vessel is shown in the pictures left?
What 4 main structures are shown in this picture?
2. Azygous arch
3. Ascending aorta
4. Descending aorta
ID the trachea bifurcating and the azygous vein
Describe the relationship between clots and contrast?
Clots will not pick up contrast and therefore will appear less dense than the surrounding structures
Where are the left and right pulmonary arteries?
If you would like to see if there is a left atrial enlargement which view would be good to use?
ID the left atrium/ventricle and right atrium/ventricle?
ID left and right ventricle
ID the brachiocephalic and SVC
which vasculature is clearly shown in the picture?
If you take a CT of the posterior chest we will view all? Anterior chest?
Posterior chest: all lungs
Anterior chest: all heart
Adrenal glands; cura of diaphragm
What are the 'Y' shaped structures? Interesting hair dew of the abdominal aorta?
ID the psoas muscle
ID minimus, medius and maximus
What is a structure that is seen in a posterior CT, but not anterior?
what is the arrow pointing to?
The fluid is simple because it has the same attenuation as the gallbladder.
What best characterizes the free fluid seen in the abdomen on this CT image?
Fattyinfiltrationofthe liver due to alcohol use
What does this CT image demonstrate?
hematomas have the same density as?
What best characterizes the structure depicted by the arrows?
what is depicted here?
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