Elekta Synergy® has pioneered the introduction of a new image guided radiation therapy technique called the intensity modulated radiation therapy (IMRT). With the introduction of Elekta Synergy®, image guided radiation therapy (IGRT) technique has touched new heights making traditional methods of radiation therapy seem redundant. This latest intensity modulated radiation therapy does not rely on assumptions about target location based on week or months old data. Elekta Synergy® with its image guided radiation therapy approach provides excellent precision and accuracy. IMRT - intensity modulated radiation therapy provides the accuracy to deliver highly complex dose distribution on modern linear accelerators. This way intensity modulated radiation therapy provides more precise test for accuracy agreement with measurements and precision repeatability of measurements of image guided radiation therapy. Intensity modulated radiation therapy is able to monitor an accuracy of 2 % and precision of 1%, as is the target requirement of image guided radiation therapy. The Intensity modulated radiation therapy is based on sparing the maximum healthy tissue from unintentional irradiation. Through image guided radiation therapy, margins placed around tumor are minimized adding to the success of IMRT. Through this first advanced multi-functional linear accelerator with intensity modulated radiation therapy (IMRT) and image guided radiation therapy (IGRT) clinicians are able to both image and treat patients in the same frame of reference.