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Related Concept Videos

Computed Tomography01:10

Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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Patient Dose Estimation in Computed Tomography-Guided Biopsy Procedures.

Evangelia Siomou1, Dimitrios K Filippiadis2, Efstathios P Efstathopoulos2

  • 1School of Health Sciences, University of Patras, 26504 Patras, Greece.

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|December 22, 2023
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Summary

This study establishes Diagnostic Reference Levels (DRLs) for computed tomography (CT)-guided biopsies, revealing significant radiation dose variations between helical and localized procedures. These findings aid in optimizing patient radiation exposure during CT-guided interventions.

Keywords:
CT-guided biopsiesdiagnostic reference levelspatient dose

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Area of Science:

  • Medical Imaging
  • Radiology
  • Radiation Dosimetry

Background:

  • Computed tomography (CT)-guided biopsies are common procedures.
  • Establishing Diagnostic Reference Levels (DRLs) is crucial for radiation protection.
  • Patient doses in CT-guided biopsies require assessment and optimization.

Purpose of the Study:

  • To establish typical Diagnostic Reference Levels (DRLs) for CT-guided biopsy procedures.
  • To assess patient radiation doses, including Effective Dose (ED), Entrance Skin Dose (ESD), and Size-Specific Dose Estimate (SSDE).
  • To compare radiation exposure between helical CT scans and localized biopsy acquisitions.

Main Methods:

  • Retrospective analysis of 226 CT-guided biopsies across five anatomical categories.
  • Calculation of ED, ESD, and SSDE using literature-derived conversion factors.
  • Determination of DRLs as median distributions following ICRP Publication 135 guidelines.

Main Results:

  • DRLs for helical CT acquisitions ranged from 7.9 to 9.7 mGy, while DRLs for biopsy acquisitions ranged from 5.6 to 7.4 mGy.
  • Median SSDE values were 7.6–10 mGy for biopsy acquisitions and 11.3–12.6 mGy for helical scans.
  • Median ED values ranged from 1.6–5.7 mSv for biopsy scans and 3.9–9.3 mSv for helical scans.

Conclusions:

  • Significant variations in radiation exposure exist between helical and localized CT-guided biopsy procedures.
  • DRLs are essential tools for optimizing radiation doses in CT-guided interventions.
  • The study provides reference dose values to guide radiation safety practices.