Trans-Rectal Ultrasound of the Female Pelvis for Real-Time MRI-US Fusion Based Needle Tracking

This study is developing a real-time MRI-guided system for tracking needles during brachytherapy (internal radiation) for cervical or uterine cancer. The goal is to improve the precision of needle placement to deliver radiation more accurately to the tumor. **You may be eligible if...** - You are 18 or older - You have been diagnosed with invasive cervical cancer, or recurrent/inoperable uterine cancer - Your treatment plan includes internal radiation therapy (brachytherapy), with or without chemotherapy - You are in good enough health for these treatments (ECOG performance status 0–2) **You may NOT be eligible if...** - You have active rectal bleeding or a rectal ulcer that would make the procedure unsafe Talk to your doctor to see if this trial is right for you.