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Estimating a size-specific dose for helical head CT examinations using Monte Carlo simulation methods.

Anthony J Hardy1,2, Maryam Bostani1,2, Andrew M Hernandez3

  • 1Department of Radiology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, 90024, USA.

Medical Physics
|December 20, 2018
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Summary

This study developed size-specific dose estimate (SSDE) conversion factors for helical head CT scans. These factors help adjust radiation doses based on patient size for improved safety.

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Monte Carlo dose simulationshead CTsize-specific dose estimate

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Area of Science:

  • Radiology
  • Medical Physics
  • Radiation Dosimetry

Background:

  • Size-specific dose estimates (SSDE) are crucial for adjusting CTDIvol to patient size.
  • Existing AAPM Report 204 SSDE conversion factors are limited to body CT examinations.
  • Helical head CT requires specific dose adjustment factors for varying patient sizes.

Purpose of the Study:

  • To determine SSDE conversion factors for helical head CT examinations.
  • To account for patient size variations in radiation dose for head CT.
  • To extend SSDE calculations beyond body CT to head CT protocols.

Main Methods:

  • Utilized Monte Carlo (MC) simulations with voxelized patient models (adult and pediatric).
  • Simulated helical head CT scans using Siemens multidetector CT source model and AAPM protocols.
  • Calculated dose metrics (brain, bone, mass-weighted average) normalized by CTDIvol,16 and related them to water equivalent diameter (Dw).

Main Results:

  • Established exponential relationships between normalized mean brain dose and Dw (R² values 0.84-0.88).
  • Found no significant difference in conversion factors across three tally regions (0.6 cc, 0.8-1.0 cm slab, entire volume).
  • Reported R² values for bone dose (0.83-0.87) and mass-weighted average dose (0.39-0.51).

Conclusions:

  • Developed conversion factors for helical head CT, describing the relationship between normalized brain dose and patient size (Dw).
  • Extended dose descriptors to include bone and mass-weighted average doses.
  • These factors can contribute to establishing SSDE coefficients for routine helical head CT.