Tuesday28 March 2017

Intensity Modulated Radiation Therapy (IMRT) &  Image Guided Radiation Therapy (IGRT)

Intensity Modulated Radiation Therapy (IMRT) & Image Guided Radiation Therapy (IGRT)

IMRT involves the use of multiple high-energy x-ray beams to target the tumor. The radiation beams are calculated in advance as part of a patient specific treatment plan to deliver precise radiation while minimizing the dose to the normal surrounding tissues. The strength of the beams can be adjusted as necessary depending on the size, location and stage of the cancer.

IGRT is radiation treatment supported by enhanced graphic targeting. By mapping and targeting the treatment area using 2 and 3-D imagery, we can achieve better patient outcomes with fewer side effects. Clinicians need the best possible image information to make fast accurate decisions when comparing reference images to set-up images prior to treatment. To achieve this CBCC utilizes the Varian On Board Imaging (OBI) kV system which delivers improved tumor targeting using high resolution, low dose digital imaging in the treatment room. A choice of imaging modalities is available on the system, including 2D radiographic, fluoroscopic, or 3D cone-beam CT imaging. The use of kV imaging can result in lower patient dose and better image quality than megavoltage imaging. This is particularly useful when addressing prostate, breast, lung, spine head/neck cancers and other sites in the body. The clinician can retarget the treatment area daily to overcome any movement of internal organs as well as the size and shape of the cancer site. This information is the basis for key decision making: whether to continue treatment as is or change course. Users can confidently manage patients and target movement—both before and during treatments.