Benchmarking learned algorithms for computed tomography image reconstruction tasks

TL;DR

This paper benchmarks various deep learning algorithms for computed tomography image reconstruction using the 2DeteCT dataset, providing a standardized, open-source evaluation framework for different methods and tasks.

Contribution

It introduces a comprehensive benchmarking pipeline and evaluates multiple learned CT reconstruction algorithms on a real-world dataset, facilitating fair comparison and future extensions.

Findings

Learned algorithms outperform traditional methods in several tasks.

The benchmarking pipeline is open-source and easily extendable.

Different methods excel in different CT reconstruction scenarios.

Abstract

Computed tomography (CT) is a widely used non-invasive diagnostic method in various fields, and recent advances in deep learning have led to significant progress in CT image reconstruction. However, the lack of large-scale, open-access datasets has hindered the comparison of different types of learned methods. To address this gap, we use the 2DeteCT dataset, a real-world experimental computed tomography dataset, for benchmarking machine learning based CT image reconstruction algorithms. We categorize these methods into post-processing networks, learned/unrolled iterative methods, learned regularizer methods, and plug-and-play methods, and provide a pipeline for easy implementation and evaluation. Using key performance metrics, including SSIM and PSNR, our benchmarking results showcase the effectiveness of various algorithms on tasks such as full data reconstruction, limited-angle reconstruction, sparse-angle reconstruction, low-dose reconstruction, and beam-hardening corrected reconstruction. With this benchmarking study, we provide an evaluation of a range of algorithms representative for different categories of learned reconstruction methods on a recently published dataset of real-world experimental CT measurements. The reproducible setup of methods and CT image reconstruction tasks in an open-source toolbox enables straightforward addition and comparison of new methods later on. The toolbox also provides the option to load the 2DeteCT dataset differently for extensions to other problems and different CT reconstruction tasks.