Dose painting shapes radiation dose unevenly across a tumor so higher-risk areas get more, and simultaneous multi-target therapy treats more than one tumor site in the same session. Together, on the Akesis Gemini 360 at 5D Cancer Services in St. George, they let the treatment team address complex disease without simply adding more visits to a patient's schedule.
What Is Dose Painting in Radiation Therapy?
Dose painting means the radiation plan doesn't deliver one flat dose across a tumor. Instead, the plan is shaped so different regions of a target receive different intensities based on what the imaging and treatment plan call for — more dose where it's needed, less where surrounding tissue needs protection. This is one of the capabilities built into the Akesis Gemini 360, the linear accelerator used for every treatment at 5D Cancer Services.
Because the Gemini 360 also has onboard cone-beam CT imaging, the treatment team can see the tumor's actual position and shape at each session before adjusting the plan. That combination — a shaped dose plan plus daily imaging — is part of what separates adaptive radiotherapy from a fixed radiation plan set once at the start of care. For more on how the imaging side of that works, see how daily imaging improves treatment accuracy.
What Is Simultaneous Multi-Target Therapy?
Simultaneous multi-target therapy is the ability to treat more than one area of disease in a single treatment session, rather than scheduling separate sessions for each site. For a patient with more than one area that needs radiation, this can mean a more efficient course of treatment overall, without a separate appointment for each target.
This capability, along with grid irradiation — delivering radiation through a patterned grid rather than a single uniform beam — is part of what the Gemini 360 platform is built to do. Whether a specific patient is a candidate for multi-target treatment in a single session depends on their diagnosis, anatomy, and treatment plan, which the care team determines individually.
How Do These Capabilities Fit Into a Course of Treatment?
Dose painting and multi-target delivery aren't separate treatments — they're planning and delivery tools the team can draw on within a standard course of radiotherapy at 5D Cancer Services. Here's how they typically factor into care:
| Capability | What it does | Why it can matter |
|---|---|---|
| Dose painting | Varies dose intensity across a target | Concentrates dose where disease is denser while limiting dose to nearby healthy tissue |
| Grid irradiation | Delivers radiation in a patterned grid | An option the planning team may use depending on the case |
| Simultaneous multi-target therapy | Treats multiple sites in one session | May reduce the total number of separate appointments needed |
| Onboard CBCT imaging | Images the patient just before treatment | Confirms anatomy so the plan can be adjusted session to session |
These tools are used across the conditions 5D Cancer Services treats, including prostate and gynecologic malignancies and certain non-cancerous conditions treated with low radiation doses. Which combination of capabilities applies to a given patient is a decision made by the treatment team based on imaging, diagnosis, and how the disease responds over the course of treatment — not a one-size-fits-all setting.
Is This Technology Right for Every Patient?
Not every case calls for dose painting or multi-target delivery — some treatment plans are more straightforward, and the team designs each plan around the individual's diagnosis and anatomy. The best way to find out what a specific treatment plan will look like is a consultation, where the team reviews imaging and discusses options. Learn more about how the overall treatment process works or visit the FAQ page for common questions from patients in St. George and Southern Utah.
This content is for informational purposes only and does not constitute medical advice. Please consult a qualified healthcare provider for guidance specific to your situation.