Advanced Imaging Modalities Flashcards
What are the different types of advanced imaging modalities?
- MDCT
- CBCT
- MRI
- Positive Contrast Examinations
— Arthrography
— Sialography - Nuclear Medicine
— PET-CT - Ultrasound
What are the advanced imaging modalities that use CT?
- MDCT
- CBCT
- MRI
- PET-CT
- Ultrasound
What are the emerging imaging modalities that use CT for dentistry?
*CBCT
*MRI
*Ultrasound
What is an MDCT?
Multi-Detector Computed Tomography
- Greater hard tissue object sensitivity than conventional
x-ray imaging systems
- Demonstrates soft tissues
Dr. Ledley (DDS) developed patent for the first ____________ scanner for larger patient openings in 1976.
“whole body” CT
What are the parts of the MDCT?
- gantry
- couch
- control console
- helical CT
MDCT Technique
uses a ____-shaped beam
fan-shaped
How does the MDCT basis-image capture work?
- Two basis-image capture sequences as the machine rotates counterclockwise from Position 1 to Position 2
- scans routinely capture in the range of 100 to 600 basis images per rotational scan
The greater the # basis images, the better the…
reconstruction algorithm
How does the MDCT work?
- Attenuated beam photon capture in the solid state cadmium tungstate detector affects energy, the degree of ionization and electrical charge
- Electrical charge is assigned a numerical value (“digitized”) for a given voxel
- Numerical value is assigned a gray scale value for the part of the object (voxel)
- Spatial and numerical information is used by imaging software to construct images (visual analogs)
Images constructed in the anatomic planes of imaging are…
- Coronal (frontal)
- Axial (transverse)
- Sagittal
What allows for determining what level of dentisty (bone, soft tissue, etc.) you want to see?
- windowing
- Hounsfield (density) Units
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