SU-E-T-636: Comparison of RapidArc-Based Radiosurgery with Cone-Based Cyberknife Treatment for Multiple Intracranial Tumors

Medical Physics
B ZhaoM Huq

Abstract

To investigate the feasibility of RapidArc technique on intracranial radiosurgery for multiple lesions. Six patients who were previously treated using cone-based technique, Cyberknife were included in this study. These patients have multiple lesions (6-9, mostly metastasis). In our current clinical practice, each lesion was planned and treated individually. The prescription was 15-21 Gy at 80% with single fraction. These cases were replanned with RapidArc on the platform of Varian Truebeam STx equipped with high resolution MLC leaves of 2.5mm at center. The maximum dose rate is 1400 MU/min at 6 MV for flattering filter free mode. Because of long span of multiple lesions, the targets were divided into two groups with two isocenters. Each plan with one isocenter contains 4 non-coplanar arcs, and dose optimization was performed with the two plans combined. Critical organs, such as eyes, brainstem and brain were constrained. The individual Cyberknife plans were summed to compare with the RapidArc plan. Scenarios of setup error were simulated during RapidArc treatment. RapidArc plans can achieve comparable target coverage and normal tissue avoidance to Cyberknife plans. The brain dose volume histogram (DVH) curves of the two techniq...Continue Reading

Related Concepts

Related Feeds

Buruli Ulcer

Buruli ulcer is a progressive disease of subcutaneous tissues caused by mycobacterium ulcerans. Here is the latest research.

Brain Abscess

Brain abscess is an accumulation of pus caused by inflammation and infected materials in the brain. Symptoms include fever, headache, seizures and other neurological problems. Discover the latest research on brain abscess today.

Related Papers

Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists
V SankaranarayananK M Ayyangar
Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists
Jia-Zhu WangKevin T Murphy
© 2022 Meta ULC. All rights reserved