| Methodologic Aspect of Stereotactic Radiosurgery |
| 뇌정위 방사선 수술기법 |
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최태진 |
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| Abstract |
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A conversing beam is firstly designed for radiosurgery by a neurosurgeon Leksell in 1949 with
orthogonal x-rays tube moving through horizontal moving arc to focusing the beam at target
center. After two decades he composits 201 source of the Co-60 for gamma knife which beams
focused at locus. Several LINAC-based stereotactic radiosurgery using the circular collimated
beam which size range for 0.4~4.0 cm in a diameter by non-coplanar multiarc have been
developed over the decades. The irregular lesions can be treated by superimposing with several
spherical shots of radiation over the tumor volume. Linac-based techniques include the use of
between 4 and 11 non-coplanar arcs and a dynamic rotation technique and use photon beam
energies in the range of 6~10 MV. More in recent; static conformal beams defined by custom
shaped collimators or a mini- or micro-multileaf collimator (mMLC) have been used in SRS. Finally;
in the last few years; intensity-modulated mMLC SRS has also been introduced. Today; many
commercial and in-house SRS programs have also introduced non-invasive immobilization systems
include the cyberknife and tomotherapy and proton beam. This document will be compared the
characteristics of dose distribution of radiosurgery as introduced gamma knife; BrainLab include
photon knife in-house SRS program and cyberknife in currently wide used for a cranial SRS. |
| Key Words:
Gamma knife, mMLC, Non-coplanar arc photon knife |
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