CT Imaging Introduction & Outline
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Questions and Answers

CT technology allows the X-ray tube to rotate continuously in one direction around the patient.

True (A)

Conventional radiographs provide a clearer image of soft tissues compared to CT scans.

False (B)

Allan MacLeod Cormack invented the first CT scanner.

False (B)

CT forms a three-dimensional image of the body using multiple angles of X-ray attenuation.

<p>False (B)</p> Signup and view all the answers

CT scanners require fewer measurements of attenuation through the body compared to conventional film methods.

<p>False (B)</p> Signup and view all the answers

Conventional Tomography allows for the visualization of three-dimensional structures in imaging.

<p>False (B)</p> Signup and view all the answers

Computed Tomography utilizes a computerized process to create multiple cross-sectional images.

<p>True (A)</p> Signup and view all the answers

A slice in CT imaging is defined as a two-dimensional cross-section of the body.

<p>False (B)</p> Signup and view all the answers

X-ray photons interact with tissues to produce diagnostic images in Computed Tomography.

<p>True (A)</p> Signup and view all the answers

The depth of a CT slice is determined by the patient's position during the scan.

<p>False (B)</p> Signup and view all the answers

Beam geometry in CT can include parallel, fan, and cone types.

<p>True (A)</p> Signup and view all the answers

Conventional X-rays can accurately differentiate between soft tissue lesions.

<p>False (B)</p> Signup and view all the answers

Projections in CT refer to X-ray beams passing through the patient at various orientations.

<p>True (A)</p> Signup and view all the answers

The first CT head scanner was introduced in 1969.

<p>False (B)</p> Signup and view all the answers

Computed Tomography uses X-rays to generate two-dimensional images.

<p>False (B)</p> Signup and view all the answers

The Nobel Prize was awarded to Cormack and Hounsfield in 1979 for their contributions to CT technology.

<p>True (A)</p> Signup and view all the answers

Axial sections in CT imaging help avoid the superimposition of images.

<p>True (A)</p> Signup and view all the answers

The absorption coefficient is related to the amount of x-ray photons transmitted through an organ.

<p>False (B)</p> Signup and view all the answers

Computed Tomography involves taking less than 100 projections during each rotation.

<p>False (B)</p> Signup and view all the answers

Sir Godfrey Hounsfield played a significant role in the development of CT scanners.

<p>True (A)</p> Signup and view all the answers

CT imaging is not effective for detecting brain tumors.

<p>False (B)</p> Signup and view all the answers

Flashcards

Conventional Tomography

Imaging technique that creates a diagnostic image of a specific tissue layer by moving the source and receptor to avoid superimposition of other tissues.

Computed Tomography

Imaging method using X-ray tissue interaction that creates multiple cross-sectional slices of the body (axial or transverse).

CT Slice

A cross-sectional part of the body scanned to create a CT image. It has three dimensions, making it a volume.

Slice Thickness

Depth of a slice in a CT image. Determined by X-ray beam width.

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CT Axial Cuts

Cross-sectional view of the body without superposition of tissues due to x-ray tube rotation and patient motion.

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X-ray Disadvantages

Conventional X-rays have limitations like two-dimensional images, tissue superimposition, low contrast, and difficulty differentiating soft tissues.

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Photon

A unit of electromagnetic radiation, such as an X-ray.

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Projection (CT)

A series of X-ray beams passing through a patient at different angles to gather information .

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Computed Tomography (CT)

A medical imaging technique that uses X-rays to create cross-sectional images of the body.

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CT Image Reconstruction

Using multiple X-ray projections to create a detailed 3D image

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Axial Sections

Cross-sectional images of the body.

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X-ray Projections

The paths of X-ray beams through the body.

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CT Indications

Reasons for using CT scans to diagnose issues like fractures, tumors, and internal organ damage.

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Absorption Coefficient(CT)

Measure of how much x-ray photons are absorbed by tissue

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Radiation Therapy Planning (CT)

Using CT scans to plan radiation treatments.

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CT Image Quality (Axial)

Clarity/accuracy of 3D slices of images, which is high when sections are axial for accurate lesions detection, with little superposition or differences in structures.

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CT Scan

A method to create detailed images of thin cross-sections of the body using X-rays. It takes measurements from many angles and uses a computer to reconstruct the image.

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CT vs. Radiograph

CT produces cross-sectional images, avoiding the overlap of structures seen in standard X-rays. CT also offers much better detail in subtle differences in X-ray absorption.

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CT Basic Principle

A CT scanner takes many measures of X-ray absorption through a thin slice of the body. This data is then used to build a digital image of the slice.

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X-ray Attenuation

The degree to which X-rays are absorbed or weakened as they pass through a material.

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Cross-Sectional Image

An image of a slice through an object, showing structures inside.

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Study Notes

CT Introduction & Historical Outline

  • Conventional Tomography: A type of imaging that creates a layered view of tissues.
  • 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.

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