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Assessment of Patient's Peak Skin Dose Using Gafchromic Films During Interventional Cardiology Procedures: Routine

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Gafchromic films effectively measure peak skin dose (PSD) in interventional cardiology procedures. This film dosimetry is recommended for complex chronic total occlusion (CTO) interventions to prevent skin injuries.

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Area of Science:

  • Medical Physics
  • Radiology
  • Cardiology

Background:

  • Patient dosimetry in interventional cardiology is crucial for radiation safety.
  • Peak skin dose (PSD) monitoring helps predict and prevent deterministic skin injuries.
  • Gafchromic films offer a potential method for accurate PSD assessment.

Purpose of the Study:

  • To evaluate the utility of Gafchromic films for measuring patient peak skin dose (PSD) during interventional cardiology procedures.
  • To correlate PSD measurements with dosimetric indicators (DIs) and dose distribution.
  • To assess the suitability of film dosimetry for different complexity levels of cardiac interventions.

Main Methods:

  • A prospective study involving 112 patients undergoing coronary angiography (CA), CA with percutaneous coronary angioplasty (CA-PTCA), or complex chronic total occlusion (CTO) angioplasty.
  • Gafchromic films were used to measure PSD.
  • Dose distribution was analyzed across 10 defined 'Thorax Body-zones'.
  • Correlations between PSD, DIs, and dose distribution were computed.

Main Results:

  • PSD increased with procedural complexity: CA (0.121 Gy), CA-PTCA (0.256 Gy), and CTO (1.116 Gy).
  • High correlations were found between PSD and DIs.
  • Strong correlations were also observed between PSD and dose distribution within the 'Thorax Body-zone'.
  • The 2 Gy threshold for skin injuries was frequently approached or exceeded in CTO procedures.

Conclusions:

  • Gafchromic film dosimetry is a viable method for assessing peak skin dose in interventional cardiology.
  • The technique is particularly valuable for complex procedures like CTO, where high doses may lead to skin injuries.
  • Film dosimetry aids in understanding dose distribution and managing radiation risks for patients.