Open AccessStreak artifact suppression in photoacoustic computed tomography using adaptive back projection
Author(s) -
Chuangjian Cai,
Xuanhao Wang,
Ke Si,
Jun Qian,
Jianwen Luo,
Cheng Ma
Publication year - 2019
Publication title -
biomedical optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.362
H-Index - 86
ISSN - 2156-7085
DOI - 10.1364/boe.10.004803
Subject(s) - streak , image quality , iterative reconstruction , projection (relational algebra) , computer science , pixel , artifact (error) , computer vision , imaging phantom , optics , artificial intelligence , algorithm , image (mathematics) , physics
For photoacoustic computed tomography (PACT), an insufficient number of ultrasound detectors can cause serious streak-type artifacts. These artifacts get overlaid on top of image features, and thus locally jeopardize image quality and resolution. Here, a reconstruction algorithm, termed Contamination-Tracing Back-Projection (CTBP), is proposed for the mitigation of streak-type artifacts. During reconstruction, CTBP adaptively adjusts the back-projection weight, whose value is determined by the likelihood of contamination, to minimize the negative influences of strong absorbers. An iterative solution of the eikonal equation is implemented to accurately trace the time of flight of different pixels. Numerical, phantom and in vivo experiments demonstrate that CTBP can dramatically suppress streak artifacts in PACT and improve image quality.