A method for determining the gantry angle for megavoltage cone beam imaging. Academic Article uri icon

Overview

abstract

  • Accurate knowledge of gantry angle is essential in megavoltage cone beam imaging (MVCBI) with an electronic portal imager. We present a method for determining the gantry angle by detecting multileaf collimator (MLC) leaf positions in projection images. During image acquisition the gantry moves continuously and the MLC operates in dynamic arc mode. Our algorithm detects the leaf positions in the images and compares them with a stationary reference leaf. Comparison of the algorithm against angles determined from the locations of fiducial markers shows the accuracy (0.26 degrees rms error) to be sufficient for MVCBI.

publication date

  • February 1, 2005

Research

keywords

  • Algorithms
  • Particle Accelerators
  • Radiographic Image Interpretation, Computer-Assisted
  • Radiotherapy Planning, Computer-Assisted
  • Radiotherapy, High-Energy

Identity

Scopus Document Identifier

  • 14644417129

Digital Object Identifier (DOI)

  • 10.1118/1.1854776

PubMed ID

  • 15789603

Additional Document Info

volume

  • 32

issue

  • 2