User Guide

These pages describe the contracts behind Projector and the reconstruction APIs. Start with Getting Started if you have not installed diffct yet.

Trajectories and geometry

Per-view trajectory tensors, built-in generators, custom scans, detector surfaces and geometry gradients.

Trajectories and Geometry

Execution and backends

Backends, precision modes and solver contracts.

Precision, training and reconstruction

Memory and chunking

Memory limits, spatial, view and pixel tiles, block stores and disk-backed volumes.

Large Volumes and Chunked Execution

Multi-GPU and multi-node

Several GPUs in one process, or torchrun across nodes, with view, space or hybrid partitions.

Multiple GPUs and Nodes

Performance

Forward, adjoint and CGLS timings for a 512³ volume on 1, 4 and 8 GPUs.

Performance

Differentiable FBP and FDK

Analytical reconstruction with autograd, and learnable filters and weights.

Differentiable analytical reconstruction

Migrating from 1.x

Move code from the circular-orbit API of diffct 1.x to per-view trajectories.

Migrating from diffct 1.x to 2.0