Specialized Imaging Flashcards
T/F: The midsagittal plane of the head is perpendicular to the receptor in a lateral ceph.
False
Lateral ceph - receptor parallel
Post-anterior projection - receptor perpendicular
A ________ is taken with the chin touching the receptor.
Water’s projection
A ____________ is taken with head and neck extended as far back as possible with the vertex of the skull on the receptor.
submentovertex projection
T/F: MDCT has superior soft tissue characterization compared to CBCT.
True
T/F: You can use contrast medium with an MDCT.
True
T/F: Voxels are in 2D while pixels are in 3D.
False
Pixel - 2D
Vixel - 3D
T/F: Window level determines brightness, window width determines contrast.
True
Level - center CT number
Width - number above and below window level
Water is displayed by which Hounsfield unit?
0
What is the Hounsfield number for bone?
Anywhere from 700-3000
What type of imaging allows for functional evaluation of tissue vascularity and temporal tissue density changes?
Perfusion MDCT after intravenous injection
Which imaging gives two data-sets with different energy levels to reduce noise and metal artifacts?
Dual Energy CT
What are the three steps of an MRI?
- Magnetic field
- Radio-frequency pulse
- Relaxation
________ is often used to evaluate head and neck squamous cell carcinomas.
PET/CT
What agent is best used for cancer cell imaging?
FDG
What agent is best used for new bone formation?
F-fluoride
