CT Scanning Principle and Components

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Questions and Answers

What is the purpose of the gantry in a CT scanner?

  • It processes the images obtained from the scanning.
  • It generates the X-ray beam and houses electronic controls. (correct)
  • It stores the projection data collected during scans.
  • It supports the patient during the scanning process.

What type of beam does the X-ray tube in a CT scanner produce?

  • A linear beam focused on a specific point.
  • A fan beam approximating the width of the body. (correct)
  • A wide beam that spreads out into a cone shape.
  • A circular beam that covers the entire body.

Which component is essential for measuring the transmitted radiation during a CT scan?

  • Gantry
  • Radiation detector (correct)
  • Image processing computer
  • Power generator

How is tissue attenuation measured in a CT scan?

<p>From multiple X-ray tube positions across a large region. (D)</p> Signup and view all the answers

What role does the computer workstation play in a CT scanner system?

<p>It processes and reconstructs data from scans. (D)</p> Signup and view all the answers

Flashcards

Computed Tomography (CT)

The technique of reconstructing an object's internal structure using multiple projections of the object. These projections are created by scanning the object with a narrow X-ray beam and measuring the transmitted radiation.

Fan Beam X-ray

A narrow beam of X-rays used to scan the body during a CT scan. The beam is shaped like a fan and covers a wide area of the body.

Detector Array

This array of detectors captures the X-rays that pass through the body during a CT scan. It measures the strength of the transmitted X-rays at different points across the body.

Projection Data Acquisition

The process of capturing and organizing the projection data during a CT scan, allowing for the reconstruction of a 3D image.

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Gantry

The central component of a CT scanner, containing the X-ray tube, detectors, and other essential components, that rotates around the patient during the scan.

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Study Notes

CT Scanning Principle

  • CT (Computed Tomography) reconstructs internal object structure from multiple projections.
  • X-ray beams scan thin body cross-sections.
  • Transmitted radiation is measured by a detector.
  • CT is a systematic collection and display of projection data.

CT Scanner Components

  • Computer workstation for operation.
  • Image processing computers.
  • Electronic cabinets.
  • Gantry (housing key components).
  • Patient imaging table.

Gantry Details

  • Houses the X-ray source, detectors, and rotating mechanisms.
  • X-ray beam production, detection, and acquisition are within the gantry's rotating part.
  • Fan-beam X-ray tube and detector array are positioned opposite each other within the gantry.
  • Three-phase power generator is also housed within the gantry.

X-ray Tube and Beam

  • X-ray tube produces a fan beam, roughly as wide as the body.
  • Measures tissue attenuation across a wide area from one tube position.
  • Detector array on the opposite side measures X-ray beam strength laterally across the body.

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