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Questions and Answers
In CT imaging, how are the slices obtained?
In CT imaging, how are the slices obtained?
- Slice by slice in the one orthogonal plane (commonly axial) then combined to get the volume (correct)
- Directly in 3D without slicing
- Imaging the whole volume then taking cuts in different orthogonal planes
- Through random planes for better visualization
What type of patient positioning is common in CBCT?
What type of patient positioning is common in CBCT?
- Prone
- Standing (correct)
- Sitting
- Supine
What is the shape of the x-ray beam in CBCT?
What is the shape of the x-ray beam in CBCT?
- Cone shaped (correct)
- Fan shaped
- Irregular
- Circular
How are raw images obtained in CT?
How are raw images obtained in CT?
What is the unit of 3D image formation in CBCT and CT?
What is the unit of 3D image formation in CBCT and CT?
Flashcards
CT slice acquisition
CT slice acquisition
Obtaining sequential images in a single plane (usually axial) and then combining them to create a 3D volume.
CBCT patient positioning
CBCT patient positioning
The standing position is commonly used for CBCT scans, particularly in dentistry.
CBCT beam shape
CBCT beam shape
CBCT uses a cone-shaped beam to capture a wider area of the anatomy.
Raw CT images
Raw CT images
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3D image unit
3D image unit
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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.
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