Design Analysis and Experimental Study of Robotic Chair for Proton Heavy Ion Radiotherapy

Figure 7

The 3D structure of the head circumference positioning module. (a) The adjustable head circumference positioning block 1 with (i) the hand-operated handle screw, (ii) bearing, (iii) screw nut, and (iv) the positioning block. (b) The adjustable head top positioning block. (c) The fixed head circumference positioning block. (d) The height adjustment mechanism. (e) Head circumference positioning bracket frame. (f) The adjustable head circumference positioning block 2.