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Clinical Whole Body Linac-MR v.2

Clinical Whole Body Linac-MR v.2
Features: 6 MV Linac; 0.5 T MR; 60 cm (H) x 110 cm (W) patient gap

First Linac-MR images of a Human Subject

The Whole Body Linac-MR v.1 imaged it's first human subject in July 2014 producing these sample images.

Linac-MR Sagital head
Linac-MR sagital view of head
Linac-MR T1 trasverse view of head
Linac-MR T1 trasverse view of head
Linac-MR T2 trasverse view of head.
Linac-MR T2 trasverse view of head

Clinical Whole Body Linac-MR v.1 installed in 2013

6 MV Linac; 0.5 T MR; 60 cm bore

Model of the Whole Body Linac-MR v.1
Model of the Whole Body Linac-MR v.1
The Whole Body Linac-MR v.1.
The Whole Body Linac-MR v.1 during construction

The Whole Body Linac-MR v.1 is installed into an existing clinical vault (depth: 19.4 ft., width: 19.8 ft., height: 12 ft.) without removing and rebuilding the walls or ceiling. The MR magnet features a high temperature superconducting magnet that does not require liquid helium or a helium exhaust vent.

Models of Whole Body Linac-MR v.1 Design

Transverse (Perpendicular) Configuration

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

Longitudinal (Parallel) Configuration

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

First Images Obtained in 2008 from the 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.

Prototype Head Linac-MR (during Construction)

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