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Correction protocols: MVI EPI or CBCT
Off line → conventional EBRT
• single fraction → recording actual delivered radiotherapy field
• multiple fractions → No Action Level protocol
On line
• essential for stereotactic RT; high dose, high precision, risk of
myelopathy
• if conventional EBRT; prevention of geographic miss; more time
needed at LINAC
• poor man’s online; visual check if PTV is in treatment field
• helpful; automatic remote couch set up