CPT® Code 77423

High energy neutron radiation treatment delivery, 1 or more isocenter(s) with coplanar or non-coplanar geometry with blocking and/or wedge, and/or compensator(s)

High energy neutron radiation treatment is a specialized therapeutic approach that utilizes neutron beams to target and treat non-operable tumors, particularly those that exhibit resistance to conventional radiation therapies. This treatment is characterized by its delivery to one or more isocenter(s), which are specific points in space where the radiation beams converge, using either coplanar or non-coplanar geometries. The use of coplanar geometry involves aligning the radiation beams in a single plane, while non-coplanar geometry allows for beams to be directed from multiple angles, enhancing the precision of the treatment. The procedure may incorporate various tools such as blocking devices, wedges, and compensators to optimize the radiation delivery and protect surrounding healthy tissues. Neutron beam therapy (NBT) is particularly effective for treating tumors located in sensitive areas such as the salivary glands, head and neck, bones, joints, and soft tissues. The unique properties of neutrons result in a high radiation biological effect, as they remain active at the target site for an extended duration. This prolonged activity increases the likelihood of damaging both strands of the DNA within cancer cells, thereby impairing their ability to survive or repair themselves after treatment. However, it is important to note that NBT also carries a higher risk of irradiating adjacent normal tissues, necessitating careful planning and execution of the treatment. To ensure effective treatment, a detailed planning process is employed, which involves determining the planning target volume, clinical target volume, and gross tumor volume. This planning allows for the identification of one or more isocenters, which are crucial for the accurate delivery of radiation. The treatment plan may utilize multiple coplanar beams to concentrate a higher radiation dose in the overlapping regions or employ non-coplanar beams to minimize exposure to critical structures near the tumor. In cases where additional sparing of critical structures is required, blocks—fabricated articles designed to shield specific areas—wedges—angled sheets that create a radiation intensity gradient—and compensators—bolus materials or filters that adjust the radiation gradient—are utilized to enhance the safety and efficacy of the treatment.