Bounded-Latency Spherical-Histogram Reconstruction for Compton Cameras
arXiv:2607.27785
The paper introduces a spherical‑histogram method that encodes each Compton camera event into angular histograms, enabling fast, bounded‑latency reconstruction of gamma‑ray images without repeatedly recomputing event‑cone interactions.
Abstract
Gamma-ray imaging with Compton cameras is computationally demanding because conventional reconstruction retains the list-mode acquisition inside the inversion loop: event-dependent cone/voxel interactions must be recomputed as the event count grows. We present a spherical-histogram framework in which each Compton event is encoded online into detector-centred angular histograms. Volumetric reconstruction is then performed from coherent histogram snapshots using a precomputed sparse projection operator. This turns the event stream into a bounded reconstruction state, decoupling event accumulation from iterative inversion. The method supports multi-view and multi-resolution operation, non-blocking acquisition, and iterative forward/backward reconstruction whose dominant cost depends.
17 pages, 9 figures