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1 - Computed Tomography: Questions/Answers
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1 - Computed Tomography: Questions/Answers
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1 - Computed Tomography: Questions/AnswersImage interpretation requires foundation in: (4) ✔ Ans - 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? ✔ Ans - because of limitations in plain radiographs
CT intro: --what are other names?
--what does it do generally? ✔ Ans - 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? ✔ Ans - 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. ✔ Ans - Tomography MRI vs CT ✔ Ans - MRI best for showing soft tissue
CT best for showing bone
what happens in the x-ray tube of CT scannner? ✔ Ans - 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 ✔ Ans - 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 ✔ Ans - 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: ✔ Ans - 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 ✔ Ans - Based on same principles as radiology
X-rays attenuated by body tissues
Radiodensities of tissue interpreted in shades of gray
Main difference is CT makes images of axial (cross-sectional) slices
Made by up to 1000 projections from different angles
What is the main difference w/ CT? ✔ Ans - Main difference is CT makes images of axial (cross-sectional) slices
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