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Patient doses from hybrid SPECT-CT procedures.

S Avramova-Cholakova1, M Dimcheva2, E Petrova3

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Summary
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This study estimated patient doses from hybrid SPECT-CT procedures across Bulgaria, revealing significant variations in current practices. Recommendations for dose optimization and diagnostic reference levels were proposed to improve safety.

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Area of Science:

  • Medical Physics
  • Radiology
  • Nuclear Medicine

Background:

  • Hybrid SPECT-CT systems are increasingly used for diagnostic imaging.
  • Accurate estimation of patient effective dose is crucial for radiation protection in these procedures.
  • Variations in imaging protocols can lead to inconsistent radiation exposure.

Purpose of the Study:

  • To estimate patient effective doses from hybrid SPECT-CT procedures in Bulgaria.
  • To analyze the variations in dose across different systems and examination types.
  • To propose optimization strategies and diagnostic reference levels for SPECT-CT examinations.

Main Methods:

  • Involved all four SPECT-CT systems in Bulgaria, estimating doses for approximately 100 patients per system.
  • Considered ten types of diagnostic SPECT-CT examinations.
  • Calculated SPECT effective doses using ICRP 53 and ICRP 80 conversion coefficients.
  • Determined CT effective doses using CT-Expo software and retrospective data (CTDIvol, DLP).
  • Performed parallel CT dose estimation using NRPB conversion coefficients where applicable.

Main Results:

  • Significant variations in current SPECT-CT imaging practices were identified.
  • Effective doses were estimated for both SPECT and CT components of the hybrid procedures.
  • Data provided a basis for understanding dose distributions in Bulgarian SPECT-CT facilities.

Conclusions:

  • The findings highlight the need for standardized protocols and optimization in SPECT-CT imaging.
  • Proposed diagnostic reference levels can guide practice and reduce unnecessary patient exposure.
  • Further research may focus on specific protocols and advanced dose reduction techniques.