SRECT: Machine-Specific Spatial-Resolution Enhancement in Computed Tomography

Li Li, Jiahui He, Yunxin Tang, Youjian Zhang, Jie Wang, Guanqun Zhou, Zhicheng Zhang

Research output: Journal PublicationConference articlepeer-review

Abstract

Computed Tomography (CT) is an advanced imaging technology. To obtain high-resolution (HR) CT images from low-resolution (LR) sinograms, we present a deep-learning (DL) based CT super-resolution (SR) method. The proposed method combines a SR model in the sinogram domain and the iterative framework into a CT SR algorithm. We unrolled the proposed method into a DL network (SRECT-Net) for adaptive estimation of inherent blurring effects causing by the insufficient sampling of LR X-Ray detector. For CT systems, if the scanning protocol is fixed, the system blur effect will remain relatively stable. Inspired by this fact, the proposed methods can be pre-trained with amounts of simulated datasets, effectively fine-tuned with just a single sample, and then obtain a machine-specific SR model. The proposed SRECT was evaluated via SR CT imaging of a Catphan700 phantom and a ham, whose performance was compared to the other DL-based CT SR methods. The results show that the proposed SRECT can provide a CT SR reconstruction performance superior to the other state-of-the-art CT SR methods, demonstrating the potential use in improving CT resolution beyond its hardware limit, lowering the requirement of CT hardware, or reducing X-Ray dose during CT imaging.

Original languageEnglish
Pages (from-to)2290-2294
Number of pages5
JournalICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
DOIs
Publication statusPublished - Mar 2024
Event2024 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2024 - Seoul, Korea, Republic of
Duration: 14 Apr 202419 Apr 2024

Keywords

  • Computed Tomography
  • Low-cost
  • Machine-specific
  • Spatial Resolution

ASJC Scopus subject areas

  • Software
  • Signal Processing
  • Electrical and Electronic Engineering

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