Aa. Boxwala et Jg. Rosenman, RETROSPECTIVE RECONSTRUCTION OF 3-DIMENSIONAL RADIOTHERAPY TREATMENT PLANS OF THE THORAX FROM 2-DIMENSIONAL PLANNING DATA, International journal of radiation oncology, biology, physics, 28(4), 1994, pp. 1009-1015
Citations number
9
Categorie Soggetti
Oncology,"Radiology,Nuclear Medicine & Medical Imaging
Purpose: A method for the retrospective reconstruction of three-dimens
ional (3-D) radiotherapy treatment plans from two-dimensional (2-D) pl
anning data is detailed in this paper. Methods and Materials: With the
se techniques the user can register an arbitrarily shaped portal on a
simulation film with a diagnostic computed tomography study of the pat
ient and then generate the resultant 3-D dose distribution or dose-vol
ume histogram. Seven treatment plans were reconstructed of patients wh
o had previously undergone 3-D treatment planning for fields involving
the thorax and who had had a diagnostic computed tomography (CT) scan
. The dose-volume histograms and the spatial positions of the beams on
the reconstructed plans were then compared to those of the original 3
-D plan, which until then, were not made available to the investigator
s. Results: The dose-volume histograms of the reconstructed plans did
not differ from those of the original plans by more than 3% except in
the low dose region. The error in positioning the beam in the reconstr
ucted plan was determined to be approximately 5 mm. Conclusion: The te
chnique of 3-D treatment plan reconstruction can be used, through retr
ospective studies, to obtain better assessments of normal tissue compl
ication probabilities and tumor control probabilities.