11. CBCT Flashcards
What is CBCT?
A 3D imaging technique providing detailed views of the dental and maxillofacial complex.
What are the principles of CBCT?
Uses a cone-shaped X-ray beam, capturing volumetric data in a single rotation scan under 30 seconds.
What are the key components of CBCT?
Includes X-ray generation, detection (flat panel detectors), and image reconstruction using Feldkamp algorithms.
What is a voxel, and how does it affect resolution in CBCT?
A voxel is the 3D equivalent of a pixel; smaller voxels improve resolution but increase noise and radiation dose.
What is bit depth, and how does it influence CBCT images?
Determines the number of gray shades; 12-bit depth allows 4096 shades, increasing image quality.
Why should the field of view (FoV) be limited in CBCT?
To focus on the area of interest and reduce radiation exposure.
What are the steps in CBCT image acquisition and reconstruction?
Scout image for positioning, 360° exposure, primary reformat (30 seconds), and secondary reformat using software.
What anatomical planes are used in CBCT imaging?
Axial, sagittal, and coronal planes; can reconstruct curved planar images for specific views.
What are inherent artifacts in CBCT imaging?
Include scatter, partial volume averaging, and cone beam effect causing distortions.
What are some procedure-related artifacts in CBCT?
Aliasing (dark/light bands), ring artifacts (scanner issues), and double contour artifacts (misalignment).
What are introduced artifacts in CBCT?
Beam hardening (dense material issues) and patient motion (blurring).
What are the main applications of CBCT?
Diagnosis and planning for implants, endodontics, orthodontics, TMJ disorders, and maxillofacial pathoses.
How does CBCT compare to panoramic imaging?
CBCT provides 3D imaging with higher resolution but more radiation; panoramic imaging is 2D with lower radiation.
What are the strengths of CBCT?
Reduced size, fast acquisition, low radiation dose compared to traditional CT, and detailed bone imaging.
What are the limitations of CBCT?
Increased radiation dose in some settings, image noise, and limited soft tissue contrast.
