An integrative framework for 3D cobb angle measurement on CT images

Area of Science:

• Medical Imaging
• Radiology
• Orthopedics

Background:

• Manual Cobb angle measurement on CT images for scoliosis is subjective and inefficient.
• Existing 2D computerized methods lack multi-angle calibration capabilities.
• Accurate 3D Cobb angle measurement is crucial for scoliosis diagnosis and treatment planning.

Purpose of the Study:

• To introduce a novel integrative framework for precise 3D Cobb angle measurement on CT images.
• To enable synchronous Cobb angle computation in three imaging planes.
• To enhance the accuracy and reliability of scoliosis assessment.

Main Methods:

• Development of an integrative framework utilizing curvature features and geometric constraints.
• Implementation of stereo estimation for Cobb angle calculation.
• Validation on 22 clinical spine models.

Main Results:

• The 3D framework demonstrated high intra-observer and inter-observer reliability (ICC > 0.94).
• The method showed robustness across different spine models (SE < 3°).
• Performance was superior to traditional manual and 2D digital methods in clinical Lenke classification.

Conclusions:

• The proposed 3D integrative framework offers a clinically advantageous solution for Cobb angle measurement.
• Simultaneous measurement in three imaging planes enhances diagnostic utility.
• This advanced method improves upon existing techniques for scoliosis assessment.