Radiation dose during CT-guided percutaneous cryoablation of renal tumors: Effect of a dose reduction protocol.
PURPOSE: To estimate and compare the radiation dose using a standard protocol and that of a dose reduction protocol in patients undergoing CT-guided percutaneous cryoablation of renal tumors.
MATERIALS AND METHODS: An IRB-approved, HIPAA-compliant retrospective study of 97 CT-guided cryoablation procedures to treat a solitary renal tumor in each of 97 patients (64 M, 33 F; range 31-84 yrs) was performed. Fifty patients were treated using a standard dose protocol (kVp=120, mean mAs=180, monitoring scans every 3 min during freezes), and an additional 47 patients were treated using a dose reduction protocol (kVp=100, mean mAs=100, monitoring scans less frequently than every 3 min during freezes). Multiple Wilcoxon Mann-Whitney (rank-sum) tests were used to compare dose-length product (DLP) between the two groups. Fisher's exact test was used to compare technique effectiveness at 12 months post ablation between the two groups.
RESULTS: Median DLP for the standard protocol group was 4833.5 mGy*cm (range, 1667-8267 mGy*cm); median DLP for the dose reduction group was 2648 mGy*cm (range, 850-7169 mGy*cm), significantly less than that of the standard protocol group (p
CONCLUSION: The radiation dose during percutaneous CT-guided cryoablation of renal tumors was substantial in both the standard and the dose reduction groups; however, it was significantly lower with the protocol change that reduced dose parameters and decreased the number of CT scans.
Published In/Presented At
Levesque, V. M., Shyn, P. B., Tuncali, K., Tatli, S., Nawfel, R. D., Olubiyi, O., & Silverman, S. G. (2015). Radiation dose during CT-guided percutaneous cryoablation of renal tumors: Effect of a dose reduction protocol. European journal of radiology, 84(11), 2218–2221. https://doi.org/10.1016/j.ejrad.2015.07.021
Diagnosis | Medicine and Health Sciences | Other Analytical, Diagnostic and Therapeutic Techniques and Equipment | Radiology
Department of Radiology and Diagnostic Medical Imaging