For patients who require immobilization, which method is typically used during simulation as well as treatment?

The method typically used for immobilization during both simulation and treatment is the thermoplastic mask. This device is particularly effective in ensuring that the patient's position remains consistent throughout the entire course of radiation therapy.

Thermoplastic masks are tailored based on the patient's individual anatomy, allowing for a snug fit that minimizes movement. They are commonly utilized in cases involving the head and neck, as they help to securely immobilize these critical areas without compromising patient safety or comfort. The mask is made from a material that becomes pliable when heated, allowing it to be molded to the contours of the patient's face and neck, thus providing a reliable and reproducible setup for treatment.

In contrast, while customized molds can also be effective, they may not be as universally applicable as thermoplastic masks, particularly for areas beyond the head and neck. Bolus is used to modify the depth of the radiation dose but does not play a primary role in immobilization. Regular blankets, though sometimes used for comfort, lack the structural integrity and customization required to ensure precise positioning during treatments.