Affiliations: Department of Radiation Oncology, Tufts -- New England
Medical Center, Boston, MA 02111, USA | Department of Neurosurgery, Tufts -- New England
Medical Center, Boston, MA 02111, USA
Note: [] Corresponding author: Jen-San Tsai, Ph.D., Department of
Radiation Oncology #246, Tufts-New England medical Center, Tufts University
School of Medicine, Boston, MA 02111, USA. Tel.: +1 617 636 1681; Fax: +1 617
636 7621; E-mail: jtsai@lifespan.org
Abstract: A GK plan (GKP) is dosimetrically reproduced following GK Frame
(GKF) system failure. A humanoid head Phantom embedded with seven targets was
used for the simulation. GKF was attached to the Phantom by 4 pin screws. GKP
using CT images solely assigned a single shot to each target for dose coverage.
The shots treatment times were based on dose prescription and the skull
geometric data (SGD). Afterwards, GKF was adjusted and CT, SGD were repeated. A
new GKP was reconstructed by transforming the shots coordinates and treatment
times from the original GKF/SGD systems to the new ones. TLDs were inserted
into the target sites for dose verifications achieving mutual agreement within
2% clinical cases forced us to do GKF reinstallation: pin loosened in the
midway of patient treatment; treatment encountered a helpless GKF collision
with the helmet. Each case, a new GKP reproduced by the aforementioned
transformations was adopted to keep GK SRS ongoing. In conclusion, if GK SRS
was forced to stop due to either a pin attachment failure or GKF collision with
helmet, then GKF readjustment and rescan images will not compromise the outcome
of a GK SRS treatment.
