CBCT Flashcards
T/F: CBCT images the area in a slice by slice fashion.
False
Images as a volume
T/F: CBCT uses an area detector.
True
T/F: Several rotations are needed to get a CBCT image.
False
One rotation
T/F: Routine CBCT imaging is the standard of care.
False
Only when will aid in diagnosis based on clinical exam
What are the limitations of CBCT?
Image noise and poor soft tissue contrast
T/F: CBCT has a submillimeter resolution.
True
What is the advantage to image-intensifier detectors?
Compatible with bridging to other softwares (CAD/CAM)
What are some disadvantages to image-intensifier detectors?
Larger, more sensitive to distortion, more calibration needed, earlier need for replacement
The ________ is the part of the detector used to amplify the electrical signal from the x-ray attenuation.
scintillator
_________ is defined as the ability to subtle changes in grayscale and distinguish from background noise.
Contrast resolution
*ability to see different densities
________ is defined as the ability of an imaging system to record separate structures positioned close to each other.
Spatial resolution
T/F: All metal including RPDs should be removed prior to CBCT imaging.
True
T/F: The largest field of view possible should be used when taking CBCT image.
False
Smallest FOV that will see what you need to see
What is typically included in a medium FOV scan?
Typically both arches
What determines the spatial resolution?
Voxel size
T/F: To achieve a sharper image, reduce the object-to-detector distance and increase the source-to-object distance.
True
T/F: Smaller voxel size will equal a higher spatial resolution.
True
What would be the result of a higher number of projections?
- Higher spatial resolution
- Greater contrast resolution
- Increased radiation dose
T/F: A 180 degree scan mode is adequate for implant treatment planning.
True
Want 360 for pulp canals
_________ are seen in CBCT when sharp changes in density are present.
Streak artifacts
What is a beam hardening artifact?
Center is very dark with bright edges
What is a starburst artifact?
Object sends streaks into nearby tissues
T/F: CBCT is much better for detecting proximal caries.
False
T/F: CBCT is much better at detecting perio disease.
False
Maybe bone craters and furcations
T/F: There is benefits for routine CBCT imaging in orthodontics.
False
T/F: CBCT is a good tool for analyzing airway obstruction.
True
T/F: The dentist is only responsible for reading the teeth in a CBCT scan.
False
Responsible for everything in the scan
