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Effective posterior extension of callosotomy by gamma knife surgery Volume 22, numéro 3, June 2020

Figure 1

(A) Gamma knife posterior callosotomy with eight shots of 4-mm collimators and one shot of 8-mm collimators making it possible to deliver a dose of 60 Gy at 50% isodose at the level of the residual part of CC. The total volume of the prescription isodose was 1.36 cm3. (B) Axial T1-weighted image with gadolinium contrast demonstrates the enhanced signals around the isodose line. C-F) Tractrography demonstrating the level of reduced corpus callosum signal relative to before GK-C (C, E) and after GK-C (D, F).