TY - JOUR
T1 - Evaluation of the dosimetric feasibility of hippocampal sparing intensity-modulated radiotherapy in patients with locally advanced nasopharyngeal carcinoma
AU - Han, Guang
AU - Liu, Dong
AU - Gan, Hua
AU - Denniston, Kyle A.
AU - Li, Sicong
AU - Tan, Wenyong
AU - Hu, Desheng
AU - Zhen, Weining
AU - Wang, Zhaohua
PY - 2014/2/28
Y1 - 2014/2/28
N2 - Purpose: The objective of this study was to evaluate the dosimetric feasibility of using hippocampus (HPC) sparing intensity-modulated radiotherapy (IMRT) in patients with locally advanced nasopharyngeal carcinoma (NPC). Materials/Methods: Eight cases of either T3 or T4 NPC were selected for this study. Standard IMRT treatment plans were constructed using the volume and dose constraints for the targets and organs at risk (OAR) per Radiation Therapy Oncology Group (RTOG) 0615 protocol. Experimental plans were constructed using the same criteria, with the addition of the HPC as an OAR. The two dose-volume histograms for each case were compared for the targets and OARs. Results: All plans achieved the protocol dose criteria. The homogeneity index, conformity index, and coverage index for the planning target volumes (PTVs) were not significantly compromised by the avoidance of the HPC. The doses to all OARs, excluding the HPC, were similar. Both the dose (Dmax, D2%, D40%, Dmean, Dmedian, D98% and Dmin) and volume (V5, V10, V15, 20, V30, V40 and V50) parameters for the HPC were significantly lower in the HPC sparing plans (P<0.05), except for Dmin (P = 0.06) and V5 (P = 0.12). Conclusions: IMRT for patients with locally advanced NPC exposes the HPC to a significant radiation dose. HPC sparing IMRT planning significantly decreases this dose, with minimal impact on the therapeutic targets and other OARs.
AB - Purpose: The objective of this study was to evaluate the dosimetric feasibility of using hippocampus (HPC) sparing intensity-modulated radiotherapy (IMRT) in patients with locally advanced nasopharyngeal carcinoma (NPC). Materials/Methods: Eight cases of either T3 or T4 NPC were selected for this study. Standard IMRT treatment plans were constructed using the volume and dose constraints for the targets and organs at risk (OAR) per Radiation Therapy Oncology Group (RTOG) 0615 protocol. Experimental plans were constructed using the same criteria, with the addition of the HPC as an OAR. The two dose-volume histograms for each case were compared for the targets and OARs. Results: All plans achieved the protocol dose criteria. The homogeneity index, conformity index, and coverage index for the planning target volumes (PTVs) were not significantly compromised by the avoidance of the HPC. The doses to all OARs, excluding the HPC, were similar. Both the dose (Dmax, D2%, D40%, Dmean, Dmedian, D98% and Dmin) and volume (V5, V10, V15, 20, V30, V40 and V50) parameters for the HPC were significantly lower in the HPC sparing plans (P<0.05), except for Dmin (P = 0.06) and V5 (P = 0.12). Conclusions: IMRT for patients with locally advanced NPC exposes the HPC to a significant radiation dose. HPC sparing IMRT planning significantly decreases this dose, with minimal impact on the therapeutic targets and other OARs.
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U2 - 10.1371/journal.pone.0090007
DO - 10.1371/journal.pone.0090007
M3 - Article
C2 - 24587184
AN - SCOPUS:84896503490
SN - 1932-6203
VL - 9
JO - PloS one
JF - PloS one
IS - 2
M1 - e90007
ER -