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Bow Tie Filters

Decrease patient dose

Two types used in different modes: Full fan or half fan mode

Full fan mode: image is acquired at the central axis on the

detector panel and images acquired from 200

0

rotation

Half fan mode: the detector is offset laterally acquiring only

half of the projection of the patient

Detector panel is offset laterally, rotates a full 360

o

captures only half

a projection and reconstructs the image from that

Recommended for larger FOV (pelvis)

Half fan filters result in the greatest HU discrepancy b/w CT and

CBCT (Ding

et al.,

Yoo and Fang-Fang, Seet

et al.

)