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X2P-Net: Context-Aware 2D/3D Vertebra Localization.

Rong Tao1, Kangqing Ye1, Weijun Zhang2

  • 1Institute of Medical Robotics, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

Bioengineering (Basel, Switzerland)
|February 27, 2026
PubMed
Summary
This summary is machine-generated.

X2P-net accurately estimates 3D spine coordinates from 2D X-rays for minimally invasive surgery. This novel framework improves vertebral localization accuracy, aiding surgical navigation and planning.

Keywords:
Transformerattentionspinevertebra detection

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Area of Science:

  • Medical Imaging
  • Computer Vision
  • Spine Surgery

Background:

  • Accurate 3D vertebral localization from 2D X-rays is vital for minimally invasive spine surgery.
  • Existing methods face challenges due to the ill-posed nature of 2D-to-3D localization and spinal column ambiguities.

Purpose of the Study:

  • Introduce X2P-net, a prompt-guided, semantic context-enhanced 2D/3D vertebra detection framework.
  • Enhance the accuracy and efficiency of vertebral localization in surgical settings.

Main Methods:

  • Developed BrickFormer, a novel Transformer architecture with a dual-attention mechanism.
  • Employed prompt-guided and semantic context enhancement for refined vertebral foreground extraction.
  • Validated the framework on synthetic (BiSpineX) and animal (SheepSpineX) datasets.

Main Results:

  • X2P-net demonstrated superior landmark localization performance compared to state-of-the-art methods.
  • Achieved high accuracy on BiSpineX: 96.9% at 10mm, 98.8% at 20mm, 2.99mm mean error, 0.9923 AUC.
  • Showcased excellent results on SheepSpineX: 98.4% at 10mm, 100.0% at 20mm, 1.08mm mean error, 0.9972 AUC.

Conclusions:

  • The proposed X2P-net framework significantly improves 2D/3D vertebra detection and localization accuracy.
  • BrickFormer's efficient context extraction contributes to the method's effectiveness.
  • X2P-net offers a promising solution for enhancing surgical navigation in minimally invasive spine procedures.