Factors that control production of scatter
- field size- as field size increases, scatter increases
- layer thickness- as layer thickness increases scatter
- kVp- as kVp increases scatter increases
Pixel composed of what axes
- X and Y only
* pixels are 2D
The Z axis represents
- the slice thickness
* voxels are 3D
Houndsfield unit water/air/bone
- water 0
- air -1,000
- bone 1,000
As slice thickness increases spatial resolution ________
- decreases
* the thicker the slice the poorer the spacial resolution.
Soul-cortef
- corticosteroid
* treats anaphylactoid reactions
Non ionic cm include
•iohexol omnipaque
Dyspnea
•difficult breathing
Ionization chamber
•is a device used to accurately measure radiation exposure
ECG cardiac cycle represents
•diastole relaxation of the heart
Idixanol
- visipaque
* non-ionic isomolar contrast agent
LOCM
•low-osmolar contrast media
Iohexol
- omnipaque
* non-ionic low-osmolar contrast media
Parenteral
•injection of medication into the body
Non stochastic
- threshold
* direct relationship between exposure and the effects
Enteric precautions
•protect against the spread of infection with fecal matter
Simple cysts of the kidney have average attenuation hounsfield value of
- 0 to +20 hounsfield units
* simple cyst contain water primarily
The abdominal aorta bifurcated at the level of
•L4
Right lateral decub is a position used to
•differentiate the pancreatic head and duodenum
During CT of the head gantry should be angled
•15 degrees above IOML
