Adaptive radiotherapy is a radiation treatment approach that adjusts the treatment plan in real time based on daily imaging of the patient's anatomy. At 5D Cancer Services in St. George, this is delivered using the Akesis Gemini 360 system, which combines onboard CBCT imaging with dose-painting technology to target tumors more precisely session to session.
What Is Adaptive Radiotherapy?
Adaptive radiotherapy re-evaluates and re-optimizes a patient's radiation plan at each treatment visit rather than relying on a single plan created weeks in advance. Because organs shift, tumors change size, and patients lose or gain weight during a treatment course, static plans can drift from the actual anatomy. Adaptive systems correct for this daily, which supports more accurate dose delivery to the target area.
How Does the Akesis Gemini 360 System Work?
The Akesis Gemini 360 is a linear accelerator (LINAC) equipped with onboard cone-beam CT (CBCT) imaging, allowing the treatment team to visualize the tumor and surrounding tissue immediately before each session. It supports dose painting, which varies radiation intensity across different regions of a tumor, and grid irradiation, a technique that delivers radiation in a patterned distribution. The system can also treat multiple targets simultaneously in a single session.
Key capabilities of the Gemini 360 include:
- Onboard CBCT imaging for same-day anatomical verification
- Dose painting to vary radiation intensity within a target
- Grid irradiation delivery patterns
- Simultaneous multi-target treatment capability
What Conditions Does Adaptive Radiotherapy Treat?
5D Cancer Services uses the Gemini 360 primarily to treat prostate and gynecologic malignancies, along with select non-cancerous conditions that respond to low-dose radiation therapy. Prostate cancer patients often benefit from daily imaging because the prostate can shift position based on bladder and rectal filling. Gynecologic cancers similarly involve anatomy that can move between sessions, making daily verification clinically relevant.
According to the American Society for Radiation Oncology (ASTRO), image-guided techniques that account for daily anatomical variation are increasingly used in prostate and pelvic radiotherapy to help reduce the margins added around a target volume (ASTRO, 2023). Smaller margins can mean less radiation exposure to nearby healthy tissue.
"Daily imaging before each treatment lets us see exactly where the anatomy is that day, rather than relying on where it was during initial planning," says the clinical team at 5D Cancer Services. "That's the core value of an adaptive workflow."
How Is Adaptive Radiotherapy Different From Traditional Radiation Therapy?
Traditional external beam radiation therapy typically uses a single CT scan for planning, with periodic imaging checks during the treatment course. Adaptive radiotherapy on the Gemini 360 re-images and can re-optimize the plan at every session.
| Feature | Traditional Radiation Therapy | Adaptive Radiotherapy (Gemini 360) |
|---|---|---|
| Imaging frequency | Initial planning CT, periodic checks | Onboard CBCT before each session |
| Plan adjustment | Fixed plan for full course | Reviewed/adjusted daily |
| Dose distribution | Uniform across target | Dose painting available |
| Multi-target treatment | Sequential | Simultaneous capability |
What Happens During Insurance Verification and Pre-Authorization?
Before treatment begins, 5D Cancer Services verifies insurance benefits and completes any required pre-authorization with the patient's carrier. This step confirms coverage details for radiation therapy services and helps patients understand what their plan requires before scheduling begins. For patients who need additional support, the practice also provides referrals to financial assistance programs.
A 2022 survey by the American Cancer Society Cancer Action Network found that navigating insurance authorization is one of the most commonly cited administrative burdens reported by radiation therapy patients (ACS CAN, 2022). Having dedicated verification support before treatment starts can reduce delays and confusion during an already demanding time.
Who Should Consider Adaptive Radiotherapy in Southern Utah?
Patients in St. George and the surrounding Southern Utah region diagnosed with prostate or gynecologic cancer, or certain non-cancerous conditions responsive to low-dose radiation, may be candidates for treatment on the Gemini 360 system. A referring physician or radiation oncology consultation is the first step to determine whether adaptive radiotherapy fits a patient's specific diagnosis and treatment goals.
Patients considering treatment should bring:
- Recent diagnostic imaging and pathology reports
- Current insurance information
- A list of current medications
- Questions about the treatment schedule and daily imaging process
5D Cancer Services, located at 1308 E 900 S B in St. George, works with patients and referring providers throughout Southern Utah to coordinate adaptive radiotherapy planning, insurance verification, and treatment scheduling.
*Sources: American Society for Radiation Oncology (ASTRO), 2023; American Cancer Society Cancer Action Network, 2022.*