Assertion: collimator's hole | /r/HasProperty | tapered for fan-beam
Facets:
Source sentences:
text: For parallel hole collimation the hole is a right circular cylinder perpendicular to the collimator face; for fan-beam the holes are tapered, slanted transaxially to focus on a focal line; for cone-beam the holes are tapered, slanted both axially and transaxially to focus on a focal point (see figure 5 ).