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Dosimetric changes with computed tomography automatic tube-current modulation techniques.

Sofia Spampinato1,2,3, Anna Maria Gueli4,5, Pietro Milone5,6

  • 1PH3DRA Laboratories (PHysics for Dating Diagnostic Dosimetry Research and Applications), Dipartimento di Fisica e Astronomia, Università di Catania and INFN-Catania, Via Santa Sofia 64, 95123, Catania, Italy. sofia.spampinato@ct.infn.it.

Radiological Physics and Technology
|April 8, 2018
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Summary
This summary is machine-generated.

This study verified computed tomography automatic tube-current modulation (ATCM) dose changes using radiochromic films and phantoms. Results confirmed that CT console dose information aligns with measurements, validating the ATCM technique.

Keywords:
Anthropomorphic phantomCTDIDLPNoise indexRadiochromic films

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Area of Science:

  • Medical Physics
  • Radiological Imaging
  • Radiation Dosimetry

Background:

  • Computed tomography (CT) utilizes automatic tube-current modulation (ATCM) to optimize radiation dose.
  • Accurate dose verification is crucial for patient safety and adherence to diagnostic reference levels.
  • Evaluating the reliability of ATCM dose reporting systems is essential for clinical practice.

Purpose of the Study:

  • To verify dose changes associated with the computed tomography automatic tube-current modulation (ATCM) technique.
  • To compare measured radiation doses with values displayed by the CT console.
  • To assess the accuracy of ATCM dose reporting using radiochromic film dosimetry.

Main Methods:

  • Utilized an anthropomorphic phantom and Gafchromic® XR-QA2 radiochromic films for dose measurements.
  • Films were adapted to thorax phantom regions for targeted dose assessment.
  • Employed three ATCM protocols with varying noise index (NI) levels, including a reference protocol.
  • Normalized film dosimetry data against the reference NI to quantify dose percentage variations.

Main Results:

  • Measurements using radiochromic films demonstrated good agreement with CT console dose values.
  • Calculated dose values, derived from film measurements and Poisson statistics, corroborated console information.
  • The study successfully verified the dose information provided by the CT console for the ATCM technique.

Conclusions:

  • The employed radiochromic film dosimetry method provides a reliable estimate for verifying CT ATCM dose variations.
  • Findings support the accuracy of CT console dose reporting for ATCM.
  • This methodology can serve as a foundation for future, more extensive dose verification studies in CT imaging.