5 Questions
In CT imaging, how are the slices obtained?
Slice by slice in the one orthogonal plane (commonly axial) then combined to get the volume
What type of patient positioning is common in CBCT?
Standing
What is the shape of the x-ray beam in CBCT?
Cone shaped
How are raw images obtained in CT?
In the form of axial slices
What is the unit of 3D image formation in CBCT and CT?
\text{Voxel}
Study Notes
CT Imaging
- In CT imaging, slices are obtained by rotating the x-ray source and detectors around the patient's body while the patient is moved through the scanner.
- Each rotation of the x-ray source and detectors captures a slice of the patient's body.
Patient Positioning in CBCT
- In Cone Beam Computed Tomography (CBCT), the common patient positioning is upright or seated, which allows for weight-bearing and functional positioning.
X-ray Beam Shape in CBCT
- The x-ray beam in CBCT is cone-shaped, which allows for a larger field of view and enables scanning of larger areas of the patient's body.
Raw Image Acquisition in CT
- In CT, raw images are obtained through a process called attenuation profiling, where the x-ray attenuation coefficients are measured as the x-ray beam passes through the patient's body.
- The raw images are then reconstructed into cross-sectional images using algorithms such as filtered backprojection.
Unit of 3D Image Formation
- The unit of 3D image formation in both CBCT and CT is the voxel, which is a three-dimensional pixel that represents a unit of volume in the patient's body.
Test your knowledge of Cone Beam Computed Tomography (CBCT) and Computed Tomography (CT) imaging with this quiz. Learn about the concepts, machines, advantages, and limitations of these imaging techniques.
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