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Updated: Aug 30, 2025

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Computed Dosimeter Dose Index on a 16-Slice Computed Tomography Scanner.

Tadelech S Mekonin1, Tilahun T Deressu1

  • 1Addis Ababa University, Addis Ababa, Ethiopia.

Dose-Response : a Publication of International Hormesis Society
|August 29, 2022
PubMed
Summary

This study validated computed tomography (CT) radiation dose measurements in standardized phantoms against scanner console displays and international standards. Results show excellent agreement, confirming the accuracy of CTDIvol and DL(0) measurements for CT dose assessment.

Keywords:
computed tomography dose indexcomputed tomography scandosimetric reference levelsradiation dose

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Area of Science:

  • Medical Physics
  • Radiological Dosimetry
  • Computed Tomography

Background:

  • Accurate quantification of radiation dose in computed tomography (CT) is crucial for patient safety and adherence to diagnostic reference levels.
  • The computed tomography dose index (CTDIvol) and central cumulative dose (DL(0)) are key metrics for assessing radiation exposure from CT scans.
  • Standardized phantoms, such as those made of polymethylmethacrylate (PMMA), are essential for reproducible and reliable dosimetric measurements.

Purpose of the Study:

  • To measure CT radiation dose using PMMA phantoms (head and body) and compare these measurements with the dose displayed on the CT scanner console.
  • To evaluate the accuracy of the CTDIvol parameter displayed by the CT scanner.
  • To compare measured dosimetric results with international dose reference levels and assess the central cumulative dose (DL(0)) against CTDIvol.

Main Methods:

  • Utilized a Philips Big Bore 16-slice CT scanner with dedicated CT dosimeter head (16 cm diameter) and body (32 cm diameter) PMMA phantoms.
  • Employed a 100 mm pencil chamber (PC) and a 20 mm short chamber (SC) coupled to an electrometer for dose measurements.
  • Calculated CTDIvol using the formalism from American Association of Physics in Medicine (AAPM) Report 96 and DL(0) per AAPM Report 111.

Main Results:

  • Measured CTDIvol values demonstrated good agreement with the CT scanner console display, with percentage disagreements below 10% (max 1.7% for body, 5.5% for head).
  • Central cumulative dose (DL(0)) measurements closely matched nominal CTDIvol values, showing agreement below 3% for abdomen and 1.0% for head scans.
  • The radiation doses delivered by the 16-slice CT system were found to be in good agreement with international dose reference levels.

Conclusions:

  • The study confirms the accuracy of the CT scanner's displayed radiation dose parameters (CTDIvol) when compared to direct phantom measurements.
  • The methodology provides a reliable approach for estimating CT radiation dosage across different anatomical regions using standardized phantoms.
  • Findings support the adherence of the evaluated CT system to international radiation dose standards, ensuring safe diagnostic imaging practices.