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Intraoperative 3D reconstruction from sparse arbitrarily posed real X-rays.

Sascha Jecklin1, Aidana Massalimova2, Ruyi Zha3

  • 1Research in Orthopedic Computer Science, Balgrist University Hospital, 8008, Zurich, Switzerland. sascha.jecklin@balgrist.ch.

Scientific Reports
|December 13, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for creating 3D spine models from X-rays, improving surgical navigation. The approach uses Gaussian splatting and requires no pretraining, making it adaptable for diverse patient anatomies.

Keywords:
Computer-assisted orthopedic surgeryDomain adaptationGaussian splattingIntraoperative 3D reconstructionSparse-view X-raySurgical navigation

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Area of Science:

  • Medical Imaging
  • Computer Vision
  • Surgical Navigation

Background:

  • Spine surgery requires precise navigation, often using image-based systems.
  • Supervised learning for 3D anatomy reconstruction from fluoroscopy has limitations, including data requirements and generalization issues.
  • Instance-learning methods like Gaussian splatting offer potential but haven't been applied to sparse intraoperative X-rays.

Purpose of the Study:

  • To extend Gaussian splatting for reconstructing anatomically consistent 3D volumes from sparse, arbitrarily posed intraoperative X-rays.
  • To improve reconstruction quality and visual consistency using an anatomy-guided radiographic standardization technique.
  • To demonstrate a pretraining-free, adaptable framework for intraoperative 3D imaging.

Main Methods:

  • Extended the [Formula: see text]-Gaussian splatting framework for 3D volume reconstruction.
  • Implemented an anatomy-guided radiographic standardization using style transfer for improved visual consistency.
  • Evaluated the approach on an ex-vivo dataset, assessing clinical utility and quantitative metrics.

Main Results:

  • Achieved anatomically consistent 3D reconstructions from sparse-view X-rays without pretraining.
  • Standardization step enhanced anatomical clarity and reconstruction quality.
  • Expert surgical evaluation confirmed clinical utility for navigation with 20-30 views.
  • Quantitative metrics showed performance trade-offs but validated standardization benefits.

Conclusions:

  • Demonstrated the feasibility of instance-based 3D volumetric reconstruction from arbitrary sparse-view X-rays.
  • The proposed framework advances intraoperative 3D imaging for spine surgery navigation.
  • The method is adaptable to new patients and anatomies without pretraining.