Figure 4
Cutaway drawing of the small-animal positioning stage for radiotherapy: (a) rotation stage with a range of 0–270°; (b, c) horizontal translation stepper motors mounted perpendicular to each other above the rotation stage with total motion ranges of 50 mm each; (d) vertical translation stepper motor with a range of 140 mm which moves the assembly of (a), (b) and (c) for positioning the target at beam height; (e) mask array with three positions for interchangeable conformal masks which define the irradiation area; (f) colour camera which feeds to the beamline control software for visually positioning the sample or animal; (g) vertical translation servo motor used to scan the entire assembly (stage, mask array and camera) through the beam with a range of 25 mm. |