1 - Computed Tomography
Image interpretation requires foundation in: (4) - correct answer ✔✔Imaging technology
--complex physics
Dimensional anatomy
--sectional anatomy
--orthogonal planes relative to anatomy
Methodical search pattern
--depends on chosen parameter
Characteristics of pathology
--soft tissue more complex than bone
why is CT required? - correct answer ✔✔because of limitations in plain radiographs
CT intro:
--what are other names?
--what does it do generally? - correct answer ✔✔Computed Tomography, CT for short (also referred to as
CAT, for Computed Axial Tomography), utilizes X-ray technology and sophisticated computers to create
images of cross-sectional "slices" through the body.
CT intro:
--what does it do and how does it work generally? - correct answer ✔✔CT exams and CAT scanning
provide a quick overview of pathologies and enable rapid analysis and treatment plans.
Anatomic cross sections are most commonly refers to transverse axial tomography.
The CT scanner was developed by Godfrey Hounsfield in the very late 1960s.
This x-ray based system created projection information of x-ray beams passed through the object from
many points across the object and from many angles (projections).
CT produces cross-sectional images and also has the ability to differentiate tissue densities, which
creates an improvement in contrast resolution.
, ______________ is a term that refers to the ability to view an anatomic section or slice through the
body. - correct answer ✔✔Tomography
MRI vs CT - correct answer ✔✔MRI best for showing soft tissue
CT best for showing bone
what happens in the x-ray tube of CT scannner? - correct answer ✔✔The x-ray tube in a CT scanner is
designed to produce a fan shaped beam of x-rays that is approximately as wide as your body.
Tissue attenuation is measured over a large region from one position of the x-ray tube
The x-ray tube on a CT scanner is more heavy duty than tubes used for standard film imaging since the
unit rotates
Conventional Tomography - correct answer ✔✔Tomography is imaging by sections or sectioning.
A device used in tomography is called a tomograph, while the image produced is a tomogram
Conventional tomography is much less clear than computerized tomography (slides 13 and 14)
Definition of CT - correct answer ✔✔Computerized Tomography process of scanning a patient to gather
x-ray absorption coefficients taken from thin sections through body, obtaining multiple measurements
from these coefficients & reconstructing these measurements into an image that displays that section's
anatomy.
CT can be broken down into 5 components: - correct answer ✔✔Scanning a patient
Gather x-ray absorption coefficients taken from thin sections through the body
Obtaining multiple measurements from these coefficients
Reconstructing these measurements into an image
Display's that section's anatomy
principles of CT - correct answer ✔✔Based on same principles as radiology
X-rays attenuated by body tissues
Radiodensities of tissue interpreted in shades of gray
Image interpretation requires foundation in: (4) - correct answer ✔✔Imaging technology
--complex physics
Dimensional anatomy
--sectional anatomy
--orthogonal planes relative to anatomy
Methodical search pattern
--depends on chosen parameter
Characteristics of pathology
--soft tissue more complex than bone
why is CT required? - correct answer ✔✔because of limitations in plain radiographs
CT intro:
--what are other names?
--what does it do generally? - correct answer ✔✔Computed Tomography, CT for short (also referred to as
CAT, for Computed Axial Tomography), utilizes X-ray technology and sophisticated computers to create
images of cross-sectional "slices" through the body.
CT intro:
--what does it do and how does it work generally? - correct answer ✔✔CT exams and CAT scanning
provide a quick overview of pathologies and enable rapid analysis and treatment plans.
Anatomic cross sections are most commonly refers to transverse axial tomography.
The CT scanner was developed by Godfrey Hounsfield in the very late 1960s.
This x-ray based system created projection information of x-ray beams passed through the object from
many points across the object and from many angles (projections).
CT produces cross-sectional images and also has the ability to differentiate tissue densities, which
creates an improvement in contrast resolution.
, ______________ is a term that refers to the ability to view an anatomic section or slice through the
body. - correct answer ✔✔Tomography
MRI vs CT - correct answer ✔✔MRI best for showing soft tissue
CT best for showing bone
what happens in the x-ray tube of CT scannner? - correct answer ✔✔The x-ray tube in a CT scanner is
designed to produce a fan shaped beam of x-rays that is approximately as wide as your body.
Tissue attenuation is measured over a large region from one position of the x-ray tube
The x-ray tube on a CT scanner is more heavy duty than tubes used for standard film imaging since the
unit rotates
Conventional Tomography - correct answer ✔✔Tomography is imaging by sections or sectioning.
A device used in tomography is called a tomograph, while the image produced is a tomogram
Conventional tomography is much less clear than computerized tomography (slides 13 and 14)
Definition of CT - correct answer ✔✔Computerized Tomography process of scanning a patient to gather
x-ray absorption coefficients taken from thin sections through body, obtaining multiple measurements
from these coefficients & reconstructing these measurements into an image that displays that section's
anatomy.
CT can be broken down into 5 components: - correct answer ✔✔Scanning a patient
Gather x-ray absorption coefficients taken from thin sections through the body
Obtaining multiple measurements from these coefficients
Reconstructing these measurements into an image
Display's that section's anatomy
principles of CT - correct answer ✔✔Based on same principles as radiology
X-rays attenuated by body tissues
Radiodensities of tissue interpreted in shades of gray
