SGRT in Head and Neck Cancer Radiotherapy

Condition(s) studied

Investigational drug(s) / intervention(s)

SGRT-guided radiotherapy with open thermoplastic mask immobilization: Patients undergo simulation and treatment using an open-face head-neck-shoulder thermoplastic mask. Before and during each fraction, the surface-guided system monitors the patient's surface position in real-time. Positioning is adjusted based on SGRT data and verified by pre-treatment CBCT.

Closed head-neck-shoulder thermoplastic mask with laser alignment: Patients undergo simulation and treatment using a standard closed head-neck-shoulder thermoplastic mask. Positioning is performed using traditional laser marks and skin tattoos, with position verified by pre-treatment CBCT. No optical surface system is used for active monitoring.

Study summary

This study is a prospective, randomized, open-label, single-center exploratory trial. A total of 40 newly diagnosed, untreated head and neck cancer patients （stage I-IVa, AJCC 8th edition） will be enrolled and randomly assigned in a 1：1 ratio to either the experimental group or the control group. The experimental group will receive radiotherapy immobilization using optical surface guidance technology combined with an open-face mask, while the control group will undergo conventional positioning with a closed head-neck-shoulder thermoplastic mask. The primary objective is to compare the six-dimensional setup errors derived from cone-beam CT （CBCT） registration and intrafraction motion between the two groups. The secondary objective is to compare dosimetric parameters of organs at risk （including lens, eyeball, spinal cord, brainstem, temporal lobe, parotid gland, submandibular gland, thyroid gland, mandible, and temporomandibular joint） between the two groups. The safety of the optical surface-guided open-face mask technique will be evaluated by monitoring radiotherapy-related adverse effects during and after treatment. This study aims to investigate whether optical surface guidance combined with open-face immobilization can improve patient comfort, provide more precise radiotherapy, and enhance the protection of normal tissues.

Eligibility

Primary outcome measure(s)

• Six-Dimensional Setup Error — First three times and weekly before each fraction during the entire radiotherapy course （typically 5-7 weeks）.
  Translational errors （X, Y, Z in mm） and rotational errors （Rx, Ry, Rz in degrees） measured via CBCT bone-window registration to planning CT.
• Intrafraction Motion — First three times and weekly before each fraction during the entire radiotherapy course （typically 5-7 weeks）.
  Magnitude of patient movement during the delivery of a fraction, detected by real-time SGRT monitoring or post-treatment CBCT.

Trial sites (1)

More Sun Yat-Sen Memorial Hospital of Sun Yat-Sen University trials in China

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