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Published on: March 7, 2011
Radiation dose in repeated CT guided radiofrequency ablations
V Tsapaki1, I A Tsalafoutas2, Ch Triantopoulou3
1Medical Physics Unit, Konstantopoulio Hospital, Agias Olgas 3-5, 142 33 Nea Ionia, Athens, Greece.
Summary
Patients undergoing repeated CT-guided radiofrequency ablations (RFA) accumulate significant radiation doses. This study quantines cumulative effective dose and peak skin dose, highlighting the need for exposure optimization and monitoring to prevent skin injuries.
Area of Science:
- Medical Physics
- Radiology
- Oncology
Background:
- Repeated CT-guided radiofrequency ablations (RFA) are common in managing malignant diseases.
- Assessing cumulative radiation exposure in these patients is crucial for patient safety.
Purpose of the Study:
- To calculate the cumulative effective dose and skin doses in patients undergoing multiple CT-guided RFA procedures.
- To evaluate the radiation burden associated with repeated RFA treatments.
Main Methods:
- Selected patients with three or more RFAs over a five-year period.
- Calculated dose length product (DLP), effective dose (E), and peak skin dose (PSD) using CT DICOM data and specialized software.
- Determined cumulative doses by summing individual procedure values and overlaid skin dose profiles for PSD calculation.
Main Results:
- Five patients (3-10 RFAs) were analyzed.
- Cumulative effective dose ranged from 0.08-0.36 Sv, with median per RFA at 35 mSv.
- Cumulative peak skin dose ranged from 0.8-3.4 Gy.
Conclusions:
- Repeated RFAs lead to substantial cumulative radiation exposure.
- While stochastic effects may be less concerning in end-stage disease, skin injury risk necessitates optimization and monitoring.
- Radiation dose management is essential for patients undergoing frequent RFA procedures.
