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20 Cards in this Set

  • Front
  • Back
A ________________ is applied to the raw data during image reconstruction. This process is called ________________.
reconstruction filter

What are the two reconstruction filters and what does each do?
2 types: sharp & smooth

sharp - improves edges

smooth - minimizes grainy appearance or noise
True or False - With 1500 projections, the back projection reconstruction would closely resemble the original object.
False, back projection(on its own) can never provide enough data to closely resemble the original object
Sharp reconstruction filters are often used for visualizing ________________. Smooth reconstruction filters are often used for visualizing ________________.
musculoskeletal detail

soft tissue contrast
Sharp recon filters are also beneficial for ________________.

Smooth recon filters are also beneficial for ________________.
high contrast regions

low contrast regions
If back projection was applied to the raw data without convolution, the tissues in the resulting image would have ________________ and would be ________________.
blurry edges

grainy or noisy
What is cone beam artifact?
When a CT tube's cone beam and the structures at the periphery of the image are not properly reconstructed with filtered back projection. Has a "spoke" or "star-like" appearance.
To prevent cone beam artifact when using a cone beam, ________________ must be used during final CT image reconstruction.
cone beam reconstruction
________________ requires the raw data, which is lost once that portion of the raw data storage device is overwritten.
retrospective reconstruction
The raw data of scan is retained on the ________________.
raw data storage device on the host computer
On ________________ scanners, a retrospective reconstruction is commonly used to modify the reconstructed slice thickness.
________________ allows for the reconstruction of images in planes that would otherwise be difficult or impossible to acquire with CT.
multi-planar reconstruction
Multi-planar reconstruction requires ________________. The ________________ is not utilized.
image data

raw data
Slices with no gaps in them are called ________________.
Using ________________ in the initial data set improves the quality of the reconstructed images.
overlapped slices
What does 3D SSD stand for?
3D Shaded Surface display
In 3D SSD, you can set the threshold value equal to the ________________ of the tissue on which we want the surface rendering, so tissues with other ________________ are ignored.
CT number

CT numbers
3D SSD is better at extracting ________________ than at distinguishing fat, muscles, and other soft tissues.
bony surfaces and skin surfaces
Volume rendering can incorporate information from the entire image data set, rather than just a surface, into the post-processed images, enabling visualization of ________________.
structures above and below the surface
VR uses ________________ or pixel volume for its display.