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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
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Radiation dose levels for interventional CT procedures.

Shuai Leng1, Jodie A Christner, Stephanie K Carlson

  • 1Department of Radiology, Mayo Clinic, Rochester, MN 55905, USA. leng.shuai@mayo.edu

AJR. American Journal of Roentgenology
|June 25, 2011
PubMed
Summary
This summary is machine-generated.

Radiation doses in CT-guided interventional procedures vary significantly by procedure type. The maximum skin dose was below the threshold for erythema, indicating a low risk of deterministic effects.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Interventional Radiology

Background:

  • CT-guided interventional procedures are increasingly common.
  • Accurate radiation dose assessment is crucial for patient safety.
  • Understanding dose variability is key to optimizing protocols.

Purpose of the Study:

  • To determine typical radiation dose levels in patients undergoing CT-guided interventional procedures.
  • To analyze dose variations across different interventional techniques.

Main Methods:

  • Retrospective analysis of 571 patients undergoing cryoablation, aspiration, biopsy, drain, or injection.
  • Dose estimation using CTDIvol and phantom measurements for skin dose.
  • Effective dose calculation using DLP and k-factors or Monte Carlo methods.

Main Results:

  • Mean skin doses ranged from 128 ± 81 mGy to 728 ± 382 mGy.
  • Mean effective doses ranged from 9.1 ± 5.5 mSv to 119.7 ± 50.3 mSv.
  • Overall mean effective dose was 24.1 mSv, with helical scans contributing more than intermittent scans.

Conclusions:

  • Significant radiation dose differences exist among CT-guided interventional procedures.
  • Observed skin doses suggest a low risk of deterministic effects.
  • Average stochastic risk is comparable to 1-10 abdominal/pelvic CT scans.