Validation of the liver mean dose in terms of the biological effective dose for the prevention of radiation-induced liver damage

Reports of Practical Oncology and Radiotherapy : Journal of Greatpoland Cancer Center in Poznań and Polish Society of Radiation Oncology
Hiroshi DoiRyoong-Jin Oh

Abstract

The purpose of this study was to determine the optimal mean liver biologically effective dose (BED) to prevent radiation-induced liver disease (RILD) in stereotactic body radiation therapy (SBRT). The actual mean doses appropriate for liver irradiation in modern radiotherapy techniques have not been adequately investigated, although SBRT is sometimes alternatively performed using fractionated regimens. SBRT treatment plans for liver tumors in 50 patients were analyzed. All distributions of the physical doses were transformed to BED2 using the linear-quadratic model. The relationship between physical doses and the BED2 for the liver were then analyzed, as was the relationship between the mean BED2 for the liver and the planning target volume (PTV). A significantly positive correlation was observed between the mean physical dose for the background liver and the mean BED2 for the whole liver (P < 0.0001, r = 0.9558). Using the LQ model, a mean BED2 of 73 and 16 Gy for the whole liver corresponded to the hepatic tolerable mean physical dose of 21 and 6 Gy for Child-Pugh A- and B-classified patients, respectively. Additionally, the PTV values were positively correlated with the BEDs for the whole liver (P < 0.0001, r = 0.8600), and ...Continue Reading

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Citations

Jul 13, 2019·Australasian Physical & Engineering Sciences in Medicine·Kevin I KauweloaPanayiotis Mavroidis

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