ct_scan op• 数据种类:projstack × ctgeometry → voxel
• 调用: import fullseye as fs; fs.ledger.fdk_reconstruct(projections, geometry, filter_name='ramp', cutoff=1.0, device='auto', allow_incomplete=False)(要直接调用实现,import ctscan; ctscan.fdk_reconstruct(projections, geometry, filter_name='ramp', cutoff=1.0, device='auto', allow_incomplete=False);从台账取用则 opstomography.get("fdk_reconstruct"))
• GPU:无(仅 CPU 参考实现)
适用于所有具备重建公式的扫描的滤波反投影：FDK 及其同类方法。
> 以下的详细说明为原文 —— 摘要与标题已翻译。
The Feldkamp-Davis-Kress steps, on one code path: weight each sample by the cosine of its ray and by the scan's redundancy, ramp-filter along the detector rows, then back-project with the (DSO / U)^2 weight. A fan is one row, a short scan takes Parker's weight, an offset detector Wang's, a helix a row window normalised per voxel, laminography a sin(tilt) scale, and a parallel beam has no divergence weight. The equiangular detector takes the (gamma / sin gamma)^2 kernel.
A scan with no formula, or an arc too short to determine the object, is refused and named: use sirt_reconstruct or tv_reconstruct.
:param projections: (view, V, U) line integrals. :param geometry: dict from ct_scan_geometry. :param filter_name: one of tomography.FILTERS except "none". :param cutoff: fraction of Nyquist to keep, (0, 1]. :param device: "auto", "cpu" or "cuda". :param allow_incomplete: reconstruct an arc under the minimum anyway. The result
is missing a wedge of the object and the density reads low.
:returns: (Z, Y, X) float attenuation volume. :raises ValueError: on a shape that disagrees with the geometry, a tomosynthesis
scan, or an incomplete arc. Empty input (projections with 0 elements) raises
ValueError.
• 示例数据目录(下载 URL / 许可证) —— 2-D 用 skimage.data(BSD/公有领域)加合成图,3-D 给出真实数据源(Stanford/PDS 等)的下载 URL。
• 算子来历与参考文献 —— 该算子族所依据的研究/方法出处。
• 算法的正典(作者、年份)与用途见上面的族使用指南。
• ct_scan_modes — py -3.11 examples/ct_scan_modes.py
voxel 作为输入)radon_volume · ct_forward_project
ct_scan)ct_scan_geometry · shepp_logan_3d · ellipsoid_phantom · ellipsoid_projections · ct_forward_project · ct_adjoint_project · sirt_reconstruct · os_sart_reconstruct
*Provenance: ctscan.py — TOMOGRAPHY 算子登记表。本条目由 tools/opdocs.py md 自动生成(请勿手工编辑)。*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.