New concept on an integrated interior magnetic resonance imaging and medical linear accelerator system for radiation therapy

Xun Jia, Zhen Tian, Yan Xi, Steve B. Jiang, Ge Wang

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Image guidance plays a critical role in radiotherapy. Currently, cone-beam computed tomography (CBCT) is routinely used in clinics for this purpose. While this modality can provide an attenuation image for therapeutic planning, low soft-tissue contrast affects the delineation of anatomical and pathological features. Efforts have recently been devoted to several MRI linear accelerator (LINAC) projects that lead to the successful combination of a full diagnostic MRI scanner with a radiotherapy machine. We present a new concept for the development of the MRI-LINAC system. Instead of combining a full MRI scanner with the LINAC platform, we propose using an interior MRI (iMRI) approach to image a specific region of interest (RoI) containing the radiation treatment target. While the conventional CBCT component still delivers a global image of the patient's anatomy, the iMRI offers local imaging of high soft-tissue contrast for tumor delineation. We describe a top-level system design for the integration of an iMRI component into an existing LINAC platform. We performed numerical analyses of the magnetic field for the iMRI to show potentially acceptable field properties in a spherical RoI with a diameter of 15 cm. This field could be shielded to a sufficiently low level around the LINAC region to avoid electromagnetic interference. Furthermore, we investigate the dosimetric impacts of this integration on the radiotherapy beam.

Original languageEnglish (US)
Article number015004
JournalJournal of Medical Imaging
Volume4
Issue number1
DOIs
StatePublished - Jan 1 2017

Fingerprint

Particle Accelerators
Linear accelerators
Radiotherapy
Magnetic resonance
Magnetic resonance imaging
Magnetic Resonance Imaging
Imaging techniques
Cone-Beam Computed Tomography
Interior Design and Furnishings
Systems Integration
Electromagnetic Phenomena
Tomography
Cones
Magnetic Fields
Tissue
Anatomy
Radiation
Signal interference
Tumors
Therapeutics

Keywords

  • image-guided radiotherapy
  • magnetic resonance imaging
  • radiotherapy

ASJC Scopus subject areas

  • Bioengineering
  • Radiology Nuclear Medicine and imaging

Cite this

New concept on an integrated interior magnetic resonance imaging and medical linear accelerator system for radiation therapy. / Jia, Xun; Tian, Zhen; Xi, Yan; Jiang, Steve B.; Wang, Ge.

In: Journal of Medical Imaging, Vol. 4, No. 1, 015004, 01.01.2017.

Research output: Contribution to journalArticle

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