2017_IGRT course book

Fan beam CT vs. Cone beam CT (same radiation quality)

Advantages of FBCT:

• Efficient, ‘optimized’ detectors

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Ionisation chambers, ultra-fast ceramics

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Detectors are shielded against scattered radiation

• Reduced scatter (imaging a smaller volume per rotation)

• Faster gantry rotation

FBCT Image quality > CBCT Image quality