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Questions and Answers
CT technology allows the X-ray tube to rotate continuously in one direction around the patient.
CT technology allows the X-ray tube to rotate continuously in one direction around the patient.
True
Conventional radiographs provide a clearer image of soft tissues compared to CT scans.
Conventional radiographs provide a clearer image of soft tissues compared to CT scans.
False
Allan MacLeod Cormack invented the first CT scanner.
Allan MacLeod Cormack invented the first CT scanner.
False
CT forms a three-dimensional image of the body using multiple angles of X-ray attenuation.
CT forms a three-dimensional image of the body using multiple angles of X-ray attenuation.
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CT scanners require fewer measurements of attenuation through the body compared to conventional film methods.
CT scanners require fewer measurements of attenuation through the body compared to conventional film methods.
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Conventional Tomography allows for the visualization of three-dimensional structures in imaging.
Conventional Tomography allows for the visualization of three-dimensional structures in imaging.
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Computed Tomography utilizes a computerized process to create multiple cross-sectional images.
Computed Tomography utilizes a computerized process to create multiple cross-sectional images.
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A slice in CT imaging is defined as a two-dimensional cross-section of the body.
A slice in CT imaging is defined as a two-dimensional cross-section of the body.
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X-ray photons interact with tissues to produce diagnostic images in Computed Tomography.
X-ray photons interact with tissues to produce diagnostic images in Computed Tomography.
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The depth of a CT slice is determined by the patient's position during the scan.
The depth of a CT slice is determined by the patient's position during the scan.
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Beam geometry in CT can include parallel, fan, and cone types.
Beam geometry in CT can include parallel, fan, and cone types.
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Conventional X-rays can accurately differentiate between soft tissue lesions.
Conventional X-rays can accurately differentiate between soft tissue lesions.
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Projections in CT refer to X-ray beams passing through the patient at various orientations.
Projections in CT refer to X-ray beams passing through the patient at various orientations.
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The first CT head scanner was introduced in 1969.
The first CT head scanner was introduced in 1969.
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Computed Tomography uses X-rays to generate two-dimensional images.
Computed Tomography uses X-rays to generate two-dimensional images.
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The Nobel Prize was awarded to Cormack and Hounsfield in 1979 for their contributions to CT technology.
The Nobel Prize was awarded to Cormack and Hounsfield in 1979 for their contributions to CT technology.
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Axial sections in CT imaging help avoid the superimposition of images.
Axial sections in CT imaging help avoid the superimposition of images.
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The absorption coefficient is related to the amount of x-ray photons transmitted through an organ.
The absorption coefficient is related to the amount of x-ray photons transmitted through an organ.
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Computed Tomography involves taking less than 100 projections during each rotation.
Computed Tomography involves taking less than 100 projections during each rotation.
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Sir Godfrey Hounsfield played a significant role in the development of CT scanners.
Sir Godfrey Hounsfield played a significant role in the development of CT scanners.
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CT imaging is not effective for detecting brain tumors.
CT imaging is not effective for detecting brain tumors.
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Study Notes
CT Introduction & Historical Outline
- Conventional Tomography: A type of imaging that creates a layered view of tissues.
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Disadvantages of Conventional X-rays:
- X-rays travel in straight lines, leading to tissue superimposition and blurring.
- Only shows two dimensions, not three.
- Cannot differentiate tissues with similar densities.
- Lower image quality.
- Less accurate for soft tissue lesions.
Computed Tomography Terminology
- Tomography: A slice or layer of an image.
- Computed: Computer processing of the data.
- Computed Tomography: Imaging modality using X-rays to obtain cross-sectional images.
- Computed Axial Tomography (CAT scan): Early CT scan method.
- Slice: A cross-sectional part of the body scanned to create a CT image.
- Slice Thickness: Determined by the width of the X-ray beam.
CT Imaging Details
- Slice Idea: Producing slices of the body using X-ray beams rotated 360 degrees around the patient.
- Photon: Unit of electromagnetic waves.
- Ray: An imaginary line between the X-ray source and detector.
- Beam: A group of rays.
Scientists' Efforts in CT Imaging
- 1917 Radon: Proposed that reconstruction of internal structures is possible with multiple projections.
- 1963 Cormack: Developed mathematical equations for calculating tissue absorption.
- 1969 Hounsfield: Designed the first CT scanner prototype.
- 1971: First clinically used CT head scanner.
- 1975: Whole-body scanning possible.
Main Principles of Computed Tomography
- CT creates multiple projections by rotating the X-ray source and detectors.
- The computer analyzes data to create a cross-sectional image.
CT vs. Conventional Radiographs
- Difference 1: CT creates cross-sectional images, unlike conventional X-rays that show superimposed images.
- Difference 2: CT has significantly higher sensitivity to X-ray attenuation differences compared to conventional radiography.
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Description
This quiz covers the basics of Computed Tomography (CT) and its historical development. It addresses the limitations of conventional X-rays, key terminologies associated with CT, and the fundamental principles of imaging. Test your knowledge on how CT scans have revolutionized medical imaging.
