Evaluation of the gamma dose distribution comparison method. Export

@article{Low2003, abstract = {The gamma tool was developed to quantitatively compare dose distributions, either measured or calculated. Before computing gamma, the dose and distance scales of the two distributions, referred to as evaluated and reference, are renormalized by dose and distance criteria, respectively. The renormalization allows the dose distribution comparison to be conducted simultaneously along dose and distance axes. The gamma quantity, calculated independently for each reference point, is the minimum distance in the renormalized multidimensional space between the evaluated distribution and the reference point. The gamma quantity degenerates to the dose-difference and distance-to-agreement tests in shallow and very steep dose gradient regions, respectively. Since being introduced, the gamma quantity has been used by investigators to evaluate dose calculation algorithms, and compare dosimetry measurements. This manuscript examines the gamma distribution behavior in two dimensions and evaluates the gamma distribution in the presence of data noise. Noise in the evaluated distribution causes the gamma distribution to be underestimated relative to the no-noise, condition. Noise in the reference distribution adds noise in the gamma distribution in proportion to the normalized dose noise. In typical clinical use, the fraction of points that exceed 3\% and 3 mm can be extensive, so we typically use 5\% and 2-3 mm in clinical evaluations. For clinical cases, the calculation time is typically 5 minutes for a 1 x 1 mm2 interpolated resolution on an 800 MHz Pentium 4 for a 14.1 x 15.2 cm2 radiographic film.}, author = {Low, D. A. and Dempsey, J. F.}, citeulike-article-id = {2990619}, journal = {Med Phys}, keywords = {algorithms, and, computer-assisted, conformal, control, dosage, gamma, humans, of, planning, processes, quality, radiometry, radiotherapy, rays, reproducibility, results, sensitivity, software, specificity, stochastic}, month = {Sep}, number = {9}, pages = {2455--2464}, posted-at = {2008-07-11 21:11:29}, priority = {2}, title = {{E}valuation of the gamma dose distribution comparison method.}, volume = {30}, year = {2003} }

TY - JOUR ID - Low2003 L3 - citeulike-article-id:2990619 N2 - The gamma tool was developed to quantitatively compare dose distributions, either measured or calculated. Before computing gamma, the dose and distance scales of the two distributions, referred to as evaluated and reference, are renormalized by dose and distance criteria, respectively. The renormalization allows the dose distribution comparison to be conducted simultaneously along dose and distance axes. The gamma quantity, calculated independently for each reference point, is the minimum distance in the renormalized multidimensional space between the evaluated distribution and the reference point. The gamma quantity degenerates to the dose-difference and distance-to-agreement tests in shallow and very steep dose gradient regions, respectively. Since being introduced, the gamma quantity has been used by investigators to evaluate dose calculation algorithms, and compare dosimetry measurements. This manuscript examines the gamma distribution behavior in two dimensions and evaluates the gamma distribution in the presence of data noise. Noise in the evaluated distribution causes the gamma distribution to be underestimated relative to the no-noise, condition. Noise in the reference distribution adds noise in the gamma distribution in proportion to the normalized dose noise. In typical clinical use, the fraction of points that exceed 3% and 3 mm can be extensive, so we typically use 5% and 2-3 mm in clinical evaluations. For clinical cases, the calculation time is typically 5 minutes for a 1 x 1 mm2 interpolated resolution on an 800 MHz Pentium 4 for a 14.1 x 15.2 cm2 radiographic film. IS - 9 JF - Med Phys EP - 2464 TI - {E}valuation of the gamma dose distribution comparison method. VL - 30 SP - 2455 KW - algorithms KW - and KW - computer-assisted KW - conformal KW - control KW - dosage KW - gamma KW - humans KW - of KW - planning KW - processes KW - quality KW - radiometry KW - radiotherapy KW - rays KW - reproducibility KW - results KW - sensitivity KW - software KW - specificity KW - stochastic AU - Low, DA AU - Dempsey, JF PY - 2003/Sep// ER -