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Updated: Oct 6, 2025

3D Imaging of Soft-Tissue Samples using an X-ray Specific Staining Method and Nanoscopic Computed Tomography
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Angular super-resolution in X-ray projection radiography using deep neural network: Implementation on rotational

Tiing Yee Siow1, Cheng-Yu Ma2, Cheng Hong Toh1

  • 1Department of Medical Imaging and Intervention, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan; College of Medicine, Chang Gung University, Taoyuan, Taiwan.

Biomedical Journal
|January 13, 2022
PubMed
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This study introduces a deep learning method for angular super-resolution (ASR) in rotational angiography. The technique reduces radiation exposure by generating intermediate projection images from fewer initial radiographs.

Area of Science:

  • Medical Imaging
  • Radiology
  • Deep Learning

Background:

  • Rotational angiography uses multiple projection angles for vasculature imaging.
  • This method increases patient exposure to ionizing radiation.
  • A novel deep learning technique was developed to address this limitation.

Purpose of the Study:

  • To develop a novel technique for super-resolving radiography at different projection angles.
  • To reduce the number of projections needed in rotational angiography procedures.
  • To minimize ionizing radiation exposure while maintaining diagnostic image quality.

Main Methods:

  • Ten models were trained for varying levels of angular super-resolution (ASR).
  • The models used the first and last frames of N+2 frames as input to super-resolve the intermediate N frames.
Keywords:
Angular super-resolutionDeep learningInterpolationProjection radiographyRotational angiography

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  • ASR levels were denoted as ASRN.

    • Main Results:

    • Large arterial structures were well preserved across all ASR levels.
    • Small arteries were visualized adequately at lower ASR levels but blurred at higher levels.
    • Noninferiority of image quality was demonstrated for ASR1-4.

    Conclusions:

    • The angular super-resolution (ASR) technique effectively generates intermediate projection frames.
    • This method holds promise for reducing radiation dose in rotational angiography.
    • The technique maintains diagnostic image quality for specific ASR levels.