scholarly journals Improving IMRT-plan quality with MLC leaf position refinement post plan optimization

2012 ◽  
Vol 39 (8) ◽  
pp. 5118-5126 ◽  
Author(s):  
Ying Niu ◽  
Guowei Zhang ◽  
Barry L. Berman ◽  
William C. Parke ◽  
Byongyong Yi ◽  
...  
Keyword(s):  
Leaf Position ◽  
Imrt Plan ◽  
Plan Quality ◽  
Plan Optimization

MO-D-BRB-03: Improving IMRT-Plan Quality with MLC Leaf Position Refinement Post Plan Optimization

2010 ◽  
Vol 37 (6Part27) ◽  
pp. 3339-3339
Author(s):  
Y Niu ◽  
G Zhang ◽  
B Berman ◽  
C Yu
Keyword(s):  
Leaf Position ◽  
Imrt Plan ◽  
Plan Quality ◽  
Plan Optimization

A Voxel Weighted Approach for IMRT Plan Optimization

2011 ◽  
Vol 81 (2) ◽  
pp. S801-S802
Author(s):  
A.F. Uribe-Sanchez ◽  
X. Jia ◽  
C. Men ◽  
S. Jiang
Keyword(s):  
Imrt Plan ◽  
Plan Optimization

Comparison of Elekta VMAT with helical tomotherapy and fixed field IMRT: Plan quality, delivery efficiency and accuracy

2010 ◽  
Vol 37 (3) ◽  
pp. 1350-1359 ◽  
Author(s):  
Min Rao ◽  
Wensha Yang ◽  
Fan Chen ◽  
Ke Sheng ◽  
Jinsong Ye ◽  
...  
Keyword(s):  
Helical Tomotherapy ◽  
Imrt Plan ◽  
Plan Quality ◽  
Fixed Field ◽  
Delivery Efficiency

scholarly journals A novel index for assessing treatment plan quality in stereotactic radiosurgery

2018 ◽  
Vol 129 (Suppl1) ◽  
pp. 118-124 ◽  
Author(s):  
Alexis Dimitriadis ◽  
Ian Paddick
Keyword(s):  
Stereotactic Radiosurgery ◽  
Treatment Plan ◽  
Efficiency Index ◽  
Target Volume ◽  
Surrounding Tissue ◽  
Plan Quality ◽  
Multiple Target ◽  
Integral Dose ◽  
Plan Optimization ◽  
Dose Volume

OBJECTIVEStereotactic radiosurgery (SRS) is characterized by high levels of conformity and steep dose gradients from the periphery of the target to surrounding tissue. Clinical studies have backed up the importance of these factors through evidence of symptomatic complications. Available data suggest that there are threshold doses above which the risk of symptomatic radionecrosis increases with the volume irradiated. Therefore, radiosurgical treatment plans should be optimized by minimizing dose to the surrounding tissue while maximizing dose to the target volume. Several metrics have been proposed to quantify radiosurgical plan quality, but all present certain weaknesses. To overcome limitations of the currently used metrics, a novel metric is proposed, the efficiency index (η50%), which is based on the principle of calculating integral doses: η50% = integral doseTV/integral dosePIV50%.METHODSThe value of η50% can be easily calculated by dividing the integral dose (mean dose × volume) to the target volume (TV) by the integral dose to the volume of 50% of the prescription isodose (PIV50%). Alternatively, differential dose-volume histograms (DVHs) of the TV and PIV50% can be used. The resulting η50% value is effectively the proportion of energy within the PIV50% that falls into the target. This value has theoretical limits of 0 and 1, with 1 being perfect. The index combines conformity, gradient, and mean dose to the target into a single value. The value of η50% was retrospectively calculated for 100 clinical SRS plans.RESULTSThe value of η50% for the 100 clinical SRS plans ranged from 37.7% to 58.0% with a mean value of 49.0%. This study also showed that the same principles used for the calculation of η50% can be adapted to produce an index suitable for multiple-target plans (Gη12Gy). Furthermore, the authors present another adaptation of the index that may play a role in plan optimization by calculating and minimizing the proportion of energy delivered to surrounding organs at risk (OARη50%).CONCLUSIONSThe proposed efficiency index is a novel approach in quantifying plan quality by combining conformity, gradient, and mean dose into a single value. It quantifies the ratio of the dose “doing good” versus the dose “doing harm,” and its adaptations can be used for multiple-target plan optimization and OAR sparing.

MO-D-BRB-01: Study of Systemic and Random Errors On VMAT and IMRT Plan Quality and Deliver Accuracy

2009 ◽  
Vol 36 (6Part20) ◽  
pp. 2692-2692
Author(s):  
F Chen ◽  
M Rao ◽  
J Ye ◽  
S Luan ◽  
D Shepard ◽  
...  
Keyword(s):  
Random Errors ◽  
Imrt Plan ◽  
Plan Quality

SU-E-T-638: Influence of Dose Rate On Step and Shoot IMRT Plan Quality and Deliverability

2013 ◽  
Vol 40 (6Part21) ◽  
pp. 352-353
Author(s):  
S Sharma ◽  
D Manigandan ◽  
A Biswas ◽  
B Mohanty ◽  
V Subramani ◽  
...  
Keyword(s):  
Dose Rate ◽  
Imrt Plan ◽  
Plan Quality ◽  
Step And Shoot

SU-E-T-720: Maintaining Prostate IMRT Plan Quality Using the Fraction of Rectum Overlapping the PTV

2013 ◽  
Vol 40 (6Part22) ◽  
pp. 372-372
Author(s):  
T Hwang ◽  
S Kang ◽  
T Suh
Keyword(s):  
Imrt Plan ◽  
Plan Quality

SU-E-T-492: Influence of Clipping PTV in Build-Up Region On IMRT Plan Quality and Deliverability

2015 ◽  
Vol 42 (6Part20) ◽  
pp. 3447-3448
Author(s):  
S Sharma ◽  
D Manigandan ◽  
P Sahai ◽  
A Biswas ◽  
V Subramani ◽  
...  
Keyword(s):  
Imrt Plan ◽  
Plan Quality

TH-E-BRE-08: GPU-Monte Carlo Based Fast IMRT Plan Optimization

2014 ◽  
Vol 41 (6Part33) ◽  
pp. 567-567
Author(s):  
Y Li ◽  
Z Tian ◽  
F Shi ◽  
S Jiang ◽  
X Jia
Keyword(s):  
Monte Carlo ◽  
Imrt Plan ◽  
Plan Optimization
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