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Abstract #4464

Investigating the sensitivity of NIPAM gel dosimetry in CyberKnife systems using MRI-based R2 mapping.

Shin-Lei Peng1, Yu-Hsuan Lin1, Feng-Yi Su2, Hung-Yi Chen3, Wei-Yu Chen1, and Chun-Hsu Yao1
1China Medical University, Taichung, Taiwan, 2China Medical University Hospital, Taichung, Taiwan, 3National Taiwan University Hospital, Taipei, Taiwan

Synopsis

Keywords: Relaxometry, Relaxometry

Motivation: The CyberKnife's high precision and complex dose gradients challenge traditional dosimetry techniques, but N-isopropylacrylamide (NIPAM) gel phantom can capture 3D dose distributions effectively.

Goal(s): This study explores using NIPAM polymer gel dosimetry with MRI-based R2 mapping to verify dose distribution in the CyberKnife stereotactic radiation system.

Approach: MRI-based R2 mapping.

Results: Results showed a dose-dependent increase in R2 values, with a peak at a 30 mm depth, reflecting maximum dose accumulation. This method provides high spatial resolution, making it a promising alternative to conventional dosimetry.

Impact: The findings suggest potential applications of NIPAM gel dosimetry in verifying dose delivery across various stereotactic treatments.

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Keywords