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. Author manuscript; available in PMC: 2017 Dec 1.
Published in final edited form as: Med Image Anal. 2017 Jul 18;42:173–188. doi: 10.1016/j.media.2017.06.011

Figure 2.

Figure 2

[R1.3,R2.1,R3.5] This figure illustrates HDR brachytherapy insertion hardware, gynecologic anatomy, and MRI images. The template grid is shown in (a). The thick cylindrical obturator and three catheters inserted through the template are shown in (b). Patient anatomy with inserted hardware is shown in (c) – perineum where the template is attached (7), cervix (3), target lesion (4), uterus (5), anus (2), and insertion hardware (6 and 1 – in blue). A sagittal MRI image with dark obturator in the middle and colored catheter artifacts is shown in (d). It is important to note that while catheters maintain the grid pattern of the template close to the patient’s perineum, they lose the pattern due to bending and crossing as they get closer to the uterus. This complicates the segmentation problem, and is addressed by our method which starts from the distal end of each catheter and tracks it to the base of the template.