IGRT uses imaging immediately before and sometimes during treatment to ensure radiation is delivered exactly where planned. This approach helps account for small changes in tumor position or organs from day to day.

In IGRT, the linear accelerators (machines that deliver radiation) are equipped with imaging technology that takes pictures (X-rays, 3-D ultrasound or, most frequently, CT scans) right before radiation delivery. Special computer software compares these images to the images taken during the CT simulation. We can then make needed adjustments to the patient's position for more precise targeting.

With this level of accuracy, we can make the radiation fields even tighter around the tumor, resulting in more accurate delivery of dose to the tumor and minimal impact to adjacent normal tissue. By minimizing radiation to your body, IGRT gives you the safest, most accurate treatment available.

Clarity^™ ultrasound is one example of IGRT technology used at specific Northwestern Medicine locations. It provides real-time visualization of soft tissue, helping improve daily targeting accuracy.

To learn more, visit radiation oncology.