Radiation dose in repeated CT guided radiofrequency ablations |
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| Institution: | 1. Medical Physics Unit, Konstantopoulio Hospital, Agias Olgas 3-5, 142 33 Nea Ionia, Athens, Greece;2. Medical Physics Dpt, Agios Savvas Hospital, 171 Alexandras Avenue, 115 22 Athens, Greece;3. CT Department, Konstantopoulio Hospital, Agias Olgas 3-5, 142 33 Nea Ionia, Athens, Greece;1. Center for Devices and Radiological Health, FDA, Silver Spring, Maryland;2. ACR, Reston, Virginia;3. Doshi Diagnostic Imaging, New York, New York;1. Department of Radiology, University of Wisconsin–Madison, Madison, Wisconsin;2. Department of Medical Physics, University of Wisconsin–Madison, Madison, Wisconsin;3. Department of Biomedical Engineering, University of Wisconsin–Madison, Madison, Wisconsin;4. Amanda Ciano is now an employee of GE Healthcare, Chicago, Illinois;1. Department of Medicine, Emory University School of Medicine, Atlanta, Georgia;2. Department of Radiology and Imaging Sciences, Emory University School of Medicine, Atlanta, Georgia;3. Department of Biostatistics, Rollins School of Public Health, Atlanta, Georgia;1. Unit of Medical Physics, European Institute of Oncology, Milano, Italy;2. Department of Radiation Oncology, European Institute of Oncology, Milano, Italy;3. Department of Electronics, Information and Bioengineering, Politecnico di Milano, Milano, Italy;4. Department of Health Sciences, Università degli Studi di Milano, Milano, Italy;1. Department of Radiology, Research Institute of Radiological Science, Yonsei University College of Medicine, Seoul, Republic of Korea;2. Medical Convergence Research Institute, Yonsei University College of Medicine, Seoul, Republic of Korea;3. Severance Biomedical Science Institute, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-752, Republic of Korea |
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| Abstract: | ObjectiveTo calculate the cumulative effective and skin doses in patients that underwent repeated CT guided radiofrequency ablations (RFA).Materials and methodsFrom all patients that had undergone RFA during a five years period those which had three or more RFAs were selected. Using the CT images DICOM data, the dose length product (DLP), effective dose (E), skin dose profiles as well as the peak skin dose (PSD) were calculated, using appropriate methods and software developed for this purpose. For each patient, cumulative DLP and E were also calculated from the sum of the respective figures of each individual procedure. To calculate PSD, the skin dose profiles of each procedure were overlaid on the same Z-axis scale using anatomical landmarks for reference and the skin doses to each point were summed up.ResultsFive patients were studied; four had undergone 3 RFAs and one 10 RFAs. Cumulative DLP, E and PSD ranges were 5.6–22.3 Gy cm, 0.08–0.36 Sv and 0.8–3.4 Gy, respectively. Median E and PSD values per RFA were 35 mSv and 0.4 Gy, respectively. For comparison purposes it must be noted that in this CT department a routine abdomen-pelvis scan results to an E of about 10 mSv.ConclusionsPatients that undergo repeated RFAs are exposed to considerably high radiation exposure levels. When these patients are in the final stage of malignant diseases, stochastic effects may not be of major concern. However, optimization of the exposure factors and monitoring of these patients to avoid skin injuries are required. |
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| Keywords: | CT-guided radiofrequency ablation Patient dose Effective dose Skin dose |
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