What is IMRT?
Intensity modulated radiation therapy (IMRT) is a state-of-the-art radiation delivery system that is used to treat difficult-to-reach tumors.
How it works
IMRT uses advanced software to plan a precise dose of radiation, based on tumor size, shape and location. A computer-controlled device called a linear accelerator delivers radiation in sculpted doses that match the exact 3D geometrical shape of the tumor, including concave and complex shapes.
With IMRT, our radiation oncologist can adjust the intensity of radiation beams across the treatment area as needed with laser accuracy. This means we can deliver higher radiation doses than traditional radiation therapy methods, while minimizing exposure to healthy tissues.
Because of its greater degree of accuracy, IMRT may be a treatment option for patients who have reached the maximum allowable dose of conventional radiation therapy and have a recurrent tumor in the treated area.
IMRT for lung cancer
Three-dimensional planning with IMRT allows your radiation oncologist to simultaneously treat multiple lung cancer tumors with different doses of radiation, while sparing healthy tissue in the lung and elsewhere.
RapidArc® shortens treatment times
RapidArc® is an advanced technology we use to deliver IMRT with speed and precision.
RapidArc radiation therapy shortens treatment times to one-half up to one-eighth that of standard radiation therapy. In a single 360-degree rotation, a linear accelerator revolves around the patient, delivering a sculpted, tightly focused beam of radiation directly to a tumor in less than two minutes.
This results in better tumor targeting and less damage to surrounding healthy tissue. It also reduces the amount of time a patient spends in radiation treatment, which is usually administered five days a week for several weeks.
Respiratory gating minimizes side effects
We also use respiratory gating to accurately target tumors by adjusting for tumor motion during IMRT.
Tumors, such as those near the lungs, often move as a result of breathing and other involuntary movement in the body. Respiratory gating enables us to “paint” optimal doses of radiation onto tumors with greater accuracy. The system tracks tumor motion as a result of breathing, helping us to target the tumor and protect healthy tissue from receiving unnecessary radiation during intensity modulated radiation therapy.