Figure 6.

Differences were observed between EUS-guided puncture and traditional prostate brachytherapy, including rotation transformation of puncture section under EUS-guided brachytherapy (A.), irregular arrangement of radioactive seeds in an EUS section (B.), parallel transformation of puncture section under traditional prostate brachytherapy (C.), and regular arrangement of radioactive seeds in an section (D.) The black dotted line represented the puncture section. The radioactive seeds (black dots) were arranged at equal distances along straight lines. E. Transformation of puncture plane was through a rotation (α⁰ Degree) of the EUS probe. R was the distance from the point A to EUS probe. H indicated the vertical movement when the minimum peripheral doses at point A reached half the therapeutic dose. The target tumor was assumed to be a spherical mass proximal to the digestive tract.