Share Email Print

Journal of Medical Imaging

New concept on an integrated interior magnetic resonance imaging and medical linear accelerator system for radiation therapy
Author(s): Xun Jia; Zhen Tian; Yan Xi; Steve B. Jiang; Ge Wang
Format Member Price Non-Member Price
PDF $20.00 $25.00

Paper 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.

Paper Details

Date Published: 2 March 2017
PDF: 10 pages
J. Med. Img. 4(1) 015004 doi: 10.1117/1.JMI.4.1.015004
Published in: Journal of Medical Imaging Volume 4, Issue 1
Show Author Affiliations
Xun Jia, The Univ. of Texas Southwestern Medical Ctr. at Dallas (United States)
Zhen Tian, The Univ. of Texas Southwestern Medical Ctr. at Dallas (United States)
Yan Xi, Rensselaer Polytechnic Institute (United States)
Steve B. Jiang, The Univ. of Texas Southwestern Medical Ctr. at Dallas (United States)
Ge Wang, Rensselaer Polytechnic Institute (United States)

© SPIE. Terms of Use
Back to Top