Huchen Xie PhD, Abstract Co-Author: Nothing to Disclose

Thomas Charles Fearon PhD, Abstract Co-Author: Nothing to Disclose

Jason Y. Cheng PhD, Presenter: Nothing to Disclose

Guang Li, Abstract Co-Author: Nothing to Disclose

Holly Ning, Abstract Co-Author: Nothing to Disclose

Barbara C. Arora, Abstract Co-Author: Nothing to Disclose

Robert W. Miller PhD, Abstract Co-Author: Nothing to Disclose

et al, Abstract Co-Author: Nothing to Disclose

With the use of our customized TPS, patient specific CT dosimetry can be determined accurately.

The current dose estimation of radiation exposure of computed tomography (CT) scans on patients has relied on dose calculation of computed tomography dose index (CTDI) on a set of “standard” anthropomorphic phantoms. Radiation dose to pediatric patients from a CT scan has been a concern as noted in a recent review article by D. J. Brenner and E. J. Hall in the N Engl J Med 2007; 357:2277-2284. A patient specific dose algorithm is desirable to better estimate the specific risk of radiation exposure to each patient.

We report a practical application of Radiation Treatment Planning System (TPS) to pediatric patient specific CT dosimetry. This study is designed to develop and test a method to estimate organ dose in pediatric patients from helical Multi Detector Computed Tomography scans based on a practical application of a Radiation Treatment Planning System (TPS) to pediatric patient specific CT dosimetry. The dosimetry algorithm is based on superposition convulsion.

The radiation dose calculation from TPS is compared with measurement of cylindrical phantoms using ionization chamber and TLD measurements on anthropomorphic phantom. The results between calculation and with cylindrical phantoms measurement are in good agreement to 1% uncertainty while anthropomorphic phantom measurements are in agreement within 5% uncertainty. The advantage of this approach is the potential for a significant reduction in computation time and the application of dose estimation on a large sample of the pediatric population.

Xie, H, Fearon, T, Cheng, J, Li, G, Ning, H, Arora, B, Miller, R, et al, , Study of Patient Specific CT Dosimetry Using Treatment Planning System.  Radiological Society of North America 2008 Scientific Assembly and Annual Meeting, February 18 - February 20, 2008 ,Chicago IL. http://archive.rsna.org/2008/6021585.html