ct_scan op• 데이터 종류: projstack × ctgeometry → voxel
• 호출: import fullseye as fs; fs.ledger.fdk_reconstruct(projections, geometry, filter_name='ramp', cutoff=1.0, device='auto', allow_incomplete=False)(구현을 직접 호출하려면 import ctscan; ctscan.fdk_reconstruct(projections, geometry, filter_name='ramp', cutoff=1.0, device='auto', allow_incomplete=False), 원장에서 가져오려면 opstomography.get("fdk_reconstruct"))
• GPU: 없음(CPU 참조 구현만)
재구성 공식이 있는 모든 스캔의 필터 역투영: FDK와 그 계열.
> 아래 상세 설명은 원문입니다 —— 요약과 제목은 번역되어 있습니다.
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.
• 샘플 데이터 카탈로그(DL URL / 라이선스) —— 2-D 는 skimage.data(BSD/public)+ 합성, 3-D 는 실데이터 소스(Stanford/PDS 등)의 DL URL.
• 연산자의 내력·참고문헌 —— 이 연산자 족의 바탕이 된 연구/기법의 출처.
• 알고리즘의 정전(저자·연도)과 용도는 위의 패밀리 사용 가이드에 적혀 있습니다.
• ct_scan_modes — py -3.11 examples/ct_scan_modes.py
• poc_ct_casting_sparse_views — py -3.11 examples/poc_ct_casting_sparse_views.py
• poc_real_walnut_cbct — py -3.11 examples/poc_real_walnut_cbct.py
voxel 를 입력으로 받는 것)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 연산자 레지스트리. 이 op 노트는 tools/opdocs.py md 가 자동 생성합니다(직접 편집하지 마세요).*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.