Ja. Purdy et al., ADVANCES IN 3-DIMENSIONAL RADIATION TREATMENT PLANNING SYSTEMS - ROOM-VIEW DISPLAY WITH REAL-TIME INTERACTIVITY, International journal of radiation oncology, biology, physics, 27(4), 1993, pp. 933-944
Citations number
61
Categorie Soggetti
Oncology,"Radiology,Nuclear Medicine & Medical Imaging
Purpose: We describe our 3-dimensional (3-D) radiation treatment plann
ing system for external photon and electron beam 3-D treatment plannin
g which provides high performance computational speed and a real-time
display which we have named ''room-view'' in which the simulated targe
t volumes, critical structures, skin surfaces, radiation beams and/or
dose surfaces fan be viewed on the display monitor from any arbitrary
viewing position. Methods and Materials: We have implemented the 3-D p
lanning system on a graphics superworkstation with parallel processing
. Patient's anatomical features are extracted from contiguous computed
tomography scan images and are displayed as wireloops or solid surfac
es. Radiation beams are displayed as a set of diverging rays plus the
polygons formed by the intersection of these rays with planes perpendi
cular to the beam axis. Controls are provided for each treatment machi
ne motion function. Photon dose calculations are performed using an ef
fective pathlength algorithm modified to accommodate 3-D off-center ra
tios. Electron dose calculations are performed using a 3-D pencil beam
model. Results: Dose distribution information can be displayed as 3-D
dose surfaces, dose-volume histograms, or as isodoses superimposed on
2-D gray scale images of the patient's anatomy. Tumor-control-probabi
lities, normal-tissue-complication probabilities and a figure-of-merit
score function are generated to aid in plan evaluation. A split-scree
n display provides a beam's-eye-view for beam positioning and design o
f patient shielding block apertures and a concurrent ''room-view'' dis
play of the patient and beam icon for viewing multiple beam set-ups, b
eam positioning, and plan evaluation. Both views are simultaneously in
teractive. Conclusion: The development of an interactive 3-D radiation
treatment planning system with a real-time room-view display has been
accomplished. The concurrent real-time beam's-eye-view and room-view
display significantly improves the efficacy of the 3-D planning proces
s.