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Intrafractional tumor motion: lung and liver
Hiroki Shirato1, Yvette Seppenwoolde, Kei Kitamura
1Department of Radiology, Hokkaido University School of Medicine, Sapporo, Japan.
Seminars in Radiation Oncology
|January 31, 2004
Summary
Reducing intrafractional tumor motion in radiotherapy is crucial. This study reviews respiratory motion and presents methods for tracking internal tumor movement, enhancing precision radiotherapy for lung and liver tumors.
Area of Science:
- Radiation oncology
- Medical physics
- Respiratory physiology
Background:
- External radiotherapy has advanced with 3D dose distribution and image-guided setup.
- Reducing intrafractional motion, particularly from respiration, is the next frontier in precision radiotherapy.
- Current data on intrafractional tumor motion remain limited.
Purpose of the Study:
- To review fundamental knowledge of respiratory physiology.
- To summarize current understanding of internal lung and liver tumor motion.
- To highlight the importance of real-time tracking and 4D treatment planning for motion management.
Main Methods:
- Development of a fluoroscopic real-time tracking system.
- Implantation techniques for fiducial markers in moving organs.
- Accumulation of data on internal tumor motion.
- Review of respiratory physiology and tumor motion literature.
Main Results:
- Respiratory motion is the primary source of intrafractional organ motion.
- Real-time tracking systems and fiducial markers aid in monitoring internal tumor motion.
- 4-dimensional treatment planning is essential for accounting for tumor motion in precision radiotherapy.
Conclusions:
- Accurate assessment and management of intrafractional tumor motion are vital for improving radiotherapy outcomes.
- Further research into real-time motion tracking and 4D planning is necessary.
- This review provides a foundation for understanding and addressing respiratory-induced tumor motion.