+
Related Flashcards
Related Topics
Cards In This Set
| Front | Back |
|
Name the type of Iso-osmolar contrast media(IOCM)
|
Iodixanol (Visipaque)
|
|
Name the three types of Non-Ionic contrast
aka "low-osmolar contrast media (LOCM)
|
Iohexol (Omnipaque)
Iopamidol (Iosve)
Ioversol (Optiray)
|
|
Name the two types of High-osmolar contrast media (HOCM)
aka "ionic contrast*
|
Iothalamate Megulumine (Conray)
Diatrizoate Sodium (Hypaque)
|
|
What is window width (WW)?
|
The ranges of shades of gray on CT image and is controlled by contrast
|
|
What is window level (WL)?
|
HU at the center of WW and controls "brightness" or density of CT image
|
|
What is photon fluence?
|
Quantity of xray photons passing thru a specific area
|
|
What is photon flux?
|
Rate at which a quantity of xray photons (fluence)passes thru a unit area over time
|
|
What is aliasing?
|
Streaking artifact caused by insufficent # of views (data samples) obtained during data acquistion
|
|
What is beam hardening?
|
Low nrg photons absorbed as xray beam passes thru object resulting in increase in average photon nrg of beam
|
|
What is binning?
|
Electronically combining signal from adjacent detector elements to produce reconstructed CT image that is thicker then detector width
|
|
What is cupping artifact?
|
Error occuring in superior portion of skull where dense bone avg with low attenuation brain tissue
**abnormal dense appearing brain parenchyma**
|
|
What is edge gradient?
|
Streak artifact that occurs at the interface bw a high density object and lower attenuation material surrounding it
|
|
What is Maximum Intensity Projection (MIP)?
|
Multiplanar reformation: display "maximum" pixel value along ray traced thru viewer
|
|
What is Minimum Intensity Projection (Min-IP)?
|
Multiplanar reformation: displays "minimum pixel value along each ray to viewer
|
|
Define Spatial Resolution
|
Ability of CT to display "fine" details
Units: line pairs per cm (lp/cm)
|
