Simulation and Treatment Planning

Simulation is the first step in preparing for radiation therapy. During this appointment, your care team creates a detailed plan to ensure your treatment is accurate and consistent.

What Is Simulation?

Simulation is a planning session that uses a CT scanner designed for radiation therapy. The radiation therapist performs the procedure under the supervision of your radiation oncologist. This process helps us determine the exact position you will use for every treatment.

How Simulation Works
•    You will lie on a treatment table in the same position you will use for therapy.
•    Lasers in the room help the therapist align your body. A quick CT image, called a scout, confirms your position.
•    If needed, the therapist will make small adjustments to ensure you are straight and stable.
•    Once you are in the correct position, we take a CT scan of the treatment area.
•    Your radiation oncologist reviews the scan and marks the area to be treated.
•    The therapist uses the laser guides to mark your skin and then places a few tiny permanent tattoos. These marks help us position you exactly the same way each day.

Simulation usually takes 30 to 60 minutes. It is painless, but you will need to remain still.

Immobilization Devices

To keep you in the same position for every treatment, we may use one or more devices:

• Wingboard: Positions both arms above your head, often used for lung or esophageal cancer.
• Vac Lok™: A custom-molded cushion that becomes rigid when air is removed. Helps keep arms or legs in place.
• Aquaplast Mask: A thermoplastic mask molded to your head and neck. It allows normal breathing and holds your head steady.
• Breast Board: Positions arms and shoulders away from the chest and elevates the body for consistent alignment. Your physician will choose the right type for you.