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Dynamic detector offsets for field of view extension in C-arm computed
tomography with application to weight-bearing imaging
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In C-arm computed tomography (CT), the field of view (FOV) is often not
sufficient to acquire certain anatomical structures, e.g., a full hip or thorax.
Proposed methods to extend the FOV use a fixed detector
displacement and a 360° scan range to double the radius of the FOV. These
trajectories are designed for circular FOVs. However, there are cases in which the
required FOV is not circular but rather an ellipsoid.
In this work, the authors show that in fan-beam CT, the use of a
dynamically adjusting detector offset can reduce the
required scan range when using a noncircular FOV. Furthermore, the authors present
an analytic solution to determine the minimal required scan ranges for
elliptic FOVs given a certain detector size and an algorithmic
approach for arbitrary FOVs.
The authors show that the proposed method can result in a substantial reduction of
the required scan range. Initial reconstructions of data sets acquired with our new
minimal trajectory yielded image quality comparable to
reconstructions of data acquired using a fixed detector
offset and a full 360° rotation.
Our results show a promising reduction of the necessary scan range especially for
ellipsoidal objects that extend the FOV. In noncircular FOVs, there exists a set
of solutions that allow a trade-off between detector
size and scan range.
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