Computed Tomography to Cone Beam Computed Tomography Deformable Image Registration for Contour Propagation Using Head and Neck, Patient-Based Computational Phantoms: A Multicenter Study: Practical Radiation Oncology

G. Loi, M. Fusella, C. Vecchi, Sebastiano Menna, F. Rosica, E. Gino, N. Maffei, E. Menghi, A. Savini, A. Roggio, L. Radici, E. Cagni, F. Lucio, L. Strigari, S. Strolin, C. Garibaldi, Chiara Romanò, M. Piovesan, P. Franco, C. Fiandra

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: To investigate the performance of various algorithms for deformable image registration (DIR) for propagating regions of interest (ROIs) using multiple commercial platforms, from computed tomography to cone beam computed tomography (CBCT) and megavoltage computed tomography. Methods and Materials: Fourteen institutions participated in the study using 5 commercial platforms: RayStation (RaySearch Laboratories, Stockholm, Sweden), MIM (Cleveland, OH), VelocityAI and SmartAdapt (Varian Medical Systems, Palo Alto, CA), and ABAS (Elekta AB, Stockholm, Sweden). Algorithms were tested on synthetic images generated with the ImSimQA (Oncology Systems Limited, Shrewsbury, UK) package by applying 2 specific deformation vector fields (DVF) to real head and neck patient datasets. On-board images from 3 systems were used: megavoltage computed tomography from Tomotherapy and 2 kinds of CBCT from a clinical linear accelerator. Image quality of the system was evaluated. The algorithms’ accuracy was assessed by comparing the DIR-mapped ROIs returned by each center with those of the reference, using the Dice similarity coefficient and mean distance to conformity metrics. Statistical inference on the validation results was carried out to identify the prognostic factors of DIR performance. Results: Analyzing 840 DIR-mapped ROIs returned by the centers, it was demonstrated that DVF intensity and image quality were significant prognostic factors of DIR performance. The accuracy of the propagated contours was generally high, and acceptable DIR performance can be obtained with lower-dose CBCT image protocols. Conclusions: The performance of the systems proved to be image quality specific, depending on the DVF type and only partially on the platforms. All systems proved to be robust against image artifacts and noise, except the demon-based software. © 2019 American Society for Radiation Oncology
Original languageEnglish
Pages (from-to)125-132
Number of pages8
JournalPract. Radiat. Oncol.
Volume10
Issue number2
DOIs
Publication statusPublished - 2020

Keywords

  • accuracy
  • Article
  • cancer patient
  • cancer prognosis
  • cancer radiotherapy
  • clinical protocol
  • computer assisted tomography
  • cone beam computed tomography
  • contour propagation
  • controlled study
  • deformation vector field
  • electric potential
  • head and neck cancer
  • human
  • image quality
  • image registration
  • Italy
  • machine learning
  • multicenter study
  • priority journal
  • radiation dose
  • radiological parameters
  • tomotherapy
  • clinical trial
  • diagnostic imaging
  • head and neck tumor
  • procedures
  • x-ray computed tomography
  • Cone-Beam Computed Tomography
  • Head and Neck Neoplasms
  • Humans
  • Tomography, X-Ray Computed

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