Stereotactic Radiotherapy of Central Nervous System and Head and Neck Lesions, Using a Conformal Intensity-Modulated...

Area of Science:

• Radiation Oncology
• Medical Physics
• Neurosurgery

Background:

• Stereotactic radiotherapy is crucial for treating central nervous system (CNS) and head and neck lesions.
• Intensity-modulated radiotherapy (IMRT) offers precise radiation delivery.
• Evaluating novel systems like Peacock for stereotactic IMRT is essential.

Purpose of the Study:

• To assess the efficacy and safety of single-fraction or fractionated stereotactic radiotherapy for CNS and head and neck lesions using the Peacock IMRT system.
• To evaluate the dosimetric parameters and clinical outcomes of treatments delivered by the Peacock system.

Main Methods:

• A retrospective analysis of 43 patients treated with the Peacock system for intra- and extra-axial lesions over 18 months.
• Utilized cranial screw-fixation for precise patient immobilization.
• Delivered intensity-modulated radiation slice-by-slice (tomotherapy) with dose prescription at 80% or 90% isodose lines.

Main Results:

• Over 70% of patients demonstrated decreased lesion size after a median follow-up of 6 months.
• High conformity (90% isodose line covering 100% of CTV in all but one patient) and acceptable heterogeneity (1.0-1.50).
• No complications related to radiation treatment were reported.

Conclusions:

• Stereotactic IMRT with the Peacock system is a safe and accurate method for treating CNS and head and neck lesions.
• The system's flexibility in fractionation and lack of volume limitations make it a valuable addition to stereotactic radiotherapy options.
• The Peacock system may offer advantages for larger or irregular lesions, especially when fractionation is beneficial.