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Questions and Answers
Slip ring technology allowed the X-ray tube to rotate continuously in multiple directions around the patient.
Slip ring technology allowed the X-ray tube to rotate continuously in multiple directions around the patient.
False
CT imaging eliminates the superimposition of 3D body structures onto a 2D recording system.
CT imaging eliminates the superimposition of 3D body structures onto a 2D recording system.
True
The sensitivity of CT to differences in X-ray attenuation is at least 10 times higher than conventional film screen recording systems.
The sensitivity of CT to differences in X-ray attenuation is at least 10 times higher than conventional film screen recording systems.
True
The mathematical technique for the CAT scan was provided by Allan MacLeod Cormack in the early 1980s.
The mathematical technique for the CAT scan was provided by Allan MacLeod Cormack in the early 1980s.
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CT scanners use only a single measurement of X-ray attenuation to reconstruct a digital image of the body cross-section.
CT scanners use only a single measurement of X-ray attenuation to reconstruct a digital image of the body cross-section.
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The first CT head scanner was developed in 1963.
The first CT head scanner was developed in 1963.
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Projections are measurements of X-ray photons transmitted through the body from various angles.
Projections are measurements of X-ray photons transmitted through the body from various angles.
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Axial sections in CT imaging are unnecessary for accurate lesion detection.
Axial sections in CT imaging are unnecessary for accurate lesion detection.
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The Nobel Prize in 1979 was awarded to Hounsfield and Cormack for their contributions to CT technology.
The Nobel Prize in 1979 was awarded to Hounsfield and Cormack for their contributions to CT technology.
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Computed Tomography uses radio waves to generate images of the body.
Computed Tomography uses radio waves to generate images of the body.
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CT scans are only used for detecting somatic diseases like bone fractures and brain tumors.
CT scans are only used for detecting somatic diseases like bone fractures and brain tumors.
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An absorption coefficient represents the amount of X-ray photons that an organ absorbs.
An absorption coefficient represents the amount of X-ray photons that an organ absorbs.
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In early CT scanners, a single slice was acquired at a time.
In early CT scanners, a single slice was acquired at a time.
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Conventional tomography produces images from multiple layers of tissue simultaneously.
Conventional tomography produces images from multiple layers of tissue simultaneously.
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Computed tomography obtains data and converts it into images using computerized methods.
Computed tomography obtains data and converts it into images using computerized methods.
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Photons are units of all electromagnetic waves.
Photons are units of all electromagnetic waves.
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Computed Tomography cannot differentiate between tissues with varying densities.
Computed Tomography cannot differentiate between tissues with varying densities.
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The thickness of a slice in a CT scan is determined by the width of the X-ray beam.
The thickness of a slice in a CT scan is determined by the width of the X-ray beam.
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Projections in computed tomography refer to X-ray beams passing through a patient at the same orientation.
Projections in computed tomography refer to X-ray beams passing through a patient at the same orientation.
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Conventional X-rays provide three-dimensional images of the body.
Conventional X-rays provide three-dimensional images of the body.
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The term 'slice' in CT imaging refers to a cross-sectional part of the body with no volume.
The term 'slice' in CT imaging refers to a cross-sectional part of the body with no volume.
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Study Notes
CT Introduction & Historical Outline
- Tomography is a type of imaging that produces a layered or sectional view of tissue
- Conventional tomography uses a moving source and image receptor to avoid superimposition of tissues
- Disadvantages of conventional X-rays include:
- Two-dimensional images, blurring, and superimposition of tissues
- Difficulty in differentiating tissues with similar densities
- Limited detail on soft tissue lesions
Computed Tomography Terminology
- Tomography means a cut, section, slice, or layer
- Computed tomography uses computerized methods to process X-ray data and create images
- Computed tomography produces axial (transverse) slices of the body
- A slice is a cross-sectional part of the body that is scanned to create a CT image
- Slice thickness is determined by the width of the X-ray beam
- CT uses axial cuts by rotating the X-ray tube and detectors around the patient
Key Terminology in CT
- Photon: A unit of electromagnetic radiation
- Ray: An imaginary line between the X-ray tube and detector
- Beam: A group of rays with different angles
CT Imaging Efforts and Principles
- Scientists made significant advancements to create effective CT imaging techniques
- CT aims to avoid tissue superimposition by obtaining cross-sectional images, and thereby achieve higher quality images
- Axial sections (cross-sectional) are crucial for better understanding of body tissues, and differentiating them even if they are located close to each other
- Standard indications in CT imaging include evaluation of blood clotting (infarctions), bone fractures, brain tumors, sinus infections, internal organ ruptures, cardiac imaging, and biopsies
Summary of CT
- CT was developed in 1972 and is now an essential medical imaging method
- CT creates three-dimensional images of the body using X-rays and rapid rotational scanning
- 1000 projections (X-ray views) are measured in each 360-degree rotation
- Measurements are made by a ring of sensitive detectors, helping reconstruct images of tissues and structures
- CT distinguishes itself from conventional radiographs in that the former produces cross-section views by eliminating superimposition of tissues present in the latter
- CT scan sensitivity enables detection of subtle changes in tissue density with more accuracy than conventional radiographs.
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Description
This quiz covers the basics of computed tomography, including its historical outline and key terminology. You'll learn about the differences between conventional and computed tomography, as well as the significance of axial slices in imaging. Join to test your knowledge on this important medical imaging technique.
