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Related Experiment Videos

Radiation dose in CT.

L N Rothenberg1, K S Pentlow

  • 1Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, NY 10021.

Radiographics : a Review Publication of the Radiological Society of North America, Inc
|November 1, 1992
PubMed
Summary
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Computed tomography (CT) offers more uniform radiation doses than conventional X-rays. Optimizing CT protocols balances patient dose and image quality for effective diagnostics.

Area of Science:

  • Medical Physics
  • Radiologic Technology
  • Diagnostic Imaging

Background:

  • Computed tomography (CT) utilizes a rotating X-ray beam, delivering absorbed radiation doses to patient tissue.
  • Radiation dose in CT is influenced by various imaging parameters, including voltage, current, scan time, and beam filtration.
  • Compared to conventional radiography, CT generally provides more uniform absorbed dose distribution within the scanned tissue section.

Purpose of the Study:

  • To analyze the factors influencing radiation dose in computed tomography.
  • To compare CT radiation doses with conventional radiologic procedures.
  • To discuss methods for dose determination and the trade-off between dose and image quality.

Main Methods:

  • Dose determination using a pencil ionization chamber with a plastic phantom for routine measurements.

Related Experiment Videos

  • Patient-specific dose assessment employing thermoluminescent dosimeters.
  • Analysis of dose variations based on imaging parameters and multiple-scan procedures.

    • Main Results:

    • CT scanning results in more uniform absorbed dose distribution compared to conventional X-ray procedures.
    • Typical multiple-scan average doses range from 40-60 mGy for head scans and 10-40 mGy for body scans.
    • Integral dose is directly proportional to the number of scanned sections; reducing dose can increase image noise.

    Conclusions:

    • Optimizing CT protocols requires balancing radiation dose and diagnostic image quality.
    • Understanding dose determinants is crucial for minimizing patient exposure in CT examinations.
    • The choice of imaging parameters significantly impacts absorbed dose and image noise in CT scans.