P. Alaei et al., Lung dose calculations at kilovoltage x-ray energies using a model-based treatment planning system, MED PHYS, 28(2), 2001, pp. 194-198
Citations number
27
Categorie Soggetti
Radiology ,Nuclear Medicine & Imaging","Medical Research Diagnosis & Treatment
The determination of the dose to organs from diagnostic x rays has become i
mportant because of reports of radiation injury to patients from fluoroscop
ically guided interventional procedures. We have modified a convolution/sup
erposition-based treatment planning system to compute the dose distribution
for kilovoltage beams. We computed lung doses using this system and compar
ed them to those calculated using the CDI3 organ dose calculation program.
We also computed average lung doses from a simulated radiofrequency ablatio
n procedure and compared our results to published doses for a similar proce
dure. Doses calculated using this system were an average of 20% lower for A
P beams and 7% higher for PA beams than those obtained using CDI3. The rati
o of the average dose to the lungs to the skin dose from the simulated abla
tion procedure ranged from 25% higher to 15% lower than that determined by
other authors. Our results show that a treatment planning system designed f
or use in the megavoltage energy range can be used for calculating organ do
ses in the diagnostic energy range. Our doses compare well with those previ
ously reported. Differences are partly due to variations in experimental te
chniques. Using a three-dimensional (3-D) treatment planning system to calc
ulate dose also allows us to generate dose volume histograms (DVH) and comp
ute normal tissue complication probabilities (NTCP) for diagnostic procedur
es. (C) 2001 American Association of Physicists in Medicine.