the maximum photon energy must be 6 mv, both with (ff) and without (fff) compensation filters, - the patient table must allow the correction of the patient position both in terms of displacements in all three spatial directions and of rotations about all three spatial axes (sogen 6dof table), - accelerator including patient table must provide geometrical precision required for high precision irradiation (diameter
isocenter sphere
In CT, the use of deep learning algorithms can automatically adjust patient positioning, find the best
isocenter for the patient as well as provide information on the optimal scan range and directions.
The healthy volunteers and patients were positioned prone with the examined arms placed above the head, and the hands were placed close to the
isocenter of the gantry.
The system's
isocenter was positioned over the area of interest and a total of 312 projection images (60 frames per second) were acquired for 5.2 s with a motorized C-arm that covered a 240[degrees] clockwise arc at a rotation speed of 55[degrees] per second during a breath-hold.
ProteusONE also offers the most advanced proton therapy technology on the market as it combines pencil beam scanning with 3-D cone beam computed tomography large field of view for true volumetric imaging at
isocenter. Its compact design makes it easy to install, integrate, operate, and finance.
The
isocenter was set on the free-breathing 3D scan using the Philips virtual simulation software.
Each beam configuration ([[theta].sub.i]) is made up of n coplanar beam directions [theta] = ([b.sub.1],[b.sub.2],...,[b.sub.n]) and each beam angle [b.sub.i] is divided into 1x1 [cm.sup.2] beamlets on the
isocenter plane along the irradiation.
It is also known that the resolution in the FOV decreases as the distance from
isocenter increases, which results in spatial variation of resolution.
Caption: FIGURE 6:
Isocenter (fiducial) location with the neuronavigation software.
The prescribed dose was normalized to 100% at the
isocenter and PTV was covered by 95% isodose surface (ICRU Report 50).
Deviations > 3 mm in the
isocenter position were corrected.
However, they employed the
isocenter dose, not the treatment dose as a predictor.
