Skip to main content

Coordinate systems

This document provides an overview of the coordinate systems used in the application, specifically the LPS (Left-Posterior-Superior) system for CBCT data and the Y-up left-hand rule for 3D space orientation.

Coordinate systems in 3D applications​

Coordinate Systems

Dicom orientation systems​

Dicom orientations

In our system, we use the LPS (Left-Posterior-Superior) coordinate system for Cone Beam Computed Tomography (CBCT) data. This is a standard medical imaging coordinate system where:

  • The X-axis points to the Left of the patient.
  • The Y-axis points to the Posterior (back) of the patient.
  • The Z-axis points to the Superior (head) of the patient.

Additionally, we follow the Y-up left-hand rule for 3D space orientation, which means:

  • The Y-axis is oriented upwards.
  • The Z-axis points forward.
  • The X-axis points to the left, completing the left-hand rule.

This consistent coordinate system ensures accurate alignment and interpretation of CBCT data.