Radiation Oncology Photo

IGRT: Image-Guided Radiation Therapy

Image-Guided Radiation Therapy (IGRT) is a type of conformal radiation treatment guided by imaging techniques such as x-rays or CT scans taken within the treatment room just prior to treatment. Systems equipped with IGRT allow clinicians to detect tumor volumes on a daily basis and automatically reposition a patient if necessary.

Stony Brook's Department of Radiation Oncology has acquired the state-of-the-art Varian® On-Board Imager® (OBI) system with 6D couch correction System for IGRT. It ensures daily setup consistency without prolonging treatment times. High-resolution stereoscopic x-rays are acquired within the treatment room and compared to images taken for treatment planning to guarantee accurate patient setup. Patients will have infrared markers placed on their skin to monitor position from the beginning to the end of treatment, ensuring millimeter precision.The OBI imager is mounted on the treatment machine via robotically controlled arms that move three dimensionally. This kV imaging systems uses its high resolution and low dose digital imaging to improve tumor targeting. The OBI is capable of multiple imaging modalities including 2D radiographic, fluoroscopic, or 3D cone-beam CT imaging. It also can manage both interfraction and intrafraction motion.