University of Alberta
Linac-MR Project Banner

Models of Whole Body Linac-MR Designs Currently Under Construction

Transverse (Perpendicular) Configuration

  • Perspective view of Transverse Configuration.
  • End view of Transverse Configuration. Note: Magnetic field is perpendicular to Linac beam.
  • 2nd end view of Transverse Configuration.

Longitudinal (Parallel) Configuration

  • Perspective view of Longitudinal Configuration.
  • 2nd perspective view of Longitudinal Configuration.
  • End view of Longitudinal Configuration. Note: Magnetic field is parallel to Linac beam.

First Images from Head Prototype

Comparision of two MR axial image without and with 6 MV linac irradiation

Left: MR axial image without 6 MV linac irradiation
Right:MR axial image during 6 MV irradiation of object imaged. Linac is without flattening filter and radiation was monitored during imaging.

Axial slices were obtained with a raw gradient echo sequence, flip angle =90o, TE=14.0 ms, TR=300 ms, Bandwidth = 10 kHz, matrix size=128x128, No-Averages=1, slice thickness=7 mm, FOV=100 mm x 100 mm.  The phantom consists of an acrylic rectangular cube 15.95 x 15.95 x 25.4 mm (0.628 x 0.628 x 1.0 inch) with holes of diameter 2.52 mm, 3.45 mm and 4.78 mm (0.099 inch, 0.136 inch, 0.188 inch) drilled parallel to the length of the rectangular cube. The cube is immersed in a 10 mM solution of CuSO4 within a plastic container 22.5 mm inner diameter.

Conceptual Models of Linac-MR

  • A perspective view of the rotatating biplanar system.
  • Whole Body System
  • Magnetic Assembly for Whole Body System

Prototype Head Linac-MR (during Construction)

  • Permanent Magnets of 0.2 Tesla MR Unit
  • View of 27cm gap between the Permanent Magnets
  • Linac Head
  • Alternate View of Linac Head