Abstract
Purpose: To establish a measurement protocol for commissioning lung heterogeneity correction using the Pinnacle3™ convolution/superposition algorithm based treatment planning system (TPS). Method and Materials: A phantom with lung density material was constructed to investigate differences between dose calculated using the Pinnacle3™ TPS and dose delivered using an Elekta™ Synergy™ linear accelerator. The phantom set‐up was 4cm solid water then 4cm lung phantom material (Gammex), then either no bolus, 1cm bolus, or 2cm bolus; then 4cm solid water. Point doses were calculated by placing points of interest (POIs) along the beam central axis at various depths. All dose distributions were calculated using the Pinnacle3™ adaptive convolve (AC) algorithm, for a 10×10cm2 AP beam (6MV and/or 15MV) @ 100 SSD and 200MU prescription. Ion chamber and/or MOSFET measurements were performed between bolus slabs for the bolus containing phantoms and POIs were generated to obtain calculated dose for each dosimeter position. In addition, a MapCheck device was placed under each phantom to measure 2D dose distributions for comparison against the calculated 2D planar dose map. Results: Agreement between calculated and measured dose using ion chamber was within ±1% for 19/23 measurements with a maximum difference of 3.23%. MOSFET measurements showed good agreement, as all measurements were within 3%. Evaluation of planar dose distribution with the MapCheck yielded a pass rate ranging from 93.2% to 98.5% based on 2% difference and 2mm distance to agreement. Conclusion: Pinnacle3™ TPS dose calculations using tissue heterogeneity showed excellent agreement with dose measured in a heterogeneous phantom using 3 different dosimeters. The measurement plan presented represents a simple, efficient, and accurate means for commissioning heterogeneous dose calculation algorithms for clinical use.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 2783 |
| Number of pages | 1 |
| Journal | Medical Physics |
| Volume | 35 |
| Issue number | 6 |
| DOIs | |
| State | Published - 2008 |
Fingerprint
ASJC Scopus subject areas
- Biophysics
- Radiology Nuclear Medicine and imaging
Cite this
SU‐GG‐T‐252 : An Efficient Technique for Commissioning a Tissue Heterogeneity Correction Algorithm for Treatment Planning for Lung Cancer. / Hall, W.; Liu, T.; Stern, Robin L; Perks, Julian R; Yang, C.; Mathew, M.; Purdy, J.
In: Medical Physics, Vol. 35, No. 6, 2008, p. 2783.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - SU‐GG‐T‐252
T2 - An Efficient Technique for Commissioning a Tissue Heterogeneity Correction Algorithm for Treatment Planning for Lung Cancer
AU - Hall, W.
AU - Liu, T.
AU - Stern, Robin L
AU - Perks, Julian R
AU - Yang, C.
AU - Mathew, M.
AU - Purdy, J.
PY - 2008
Y1 - 2008
N2 - Purpose: To establish a measurement protocol for commissioning lung heterogeneity correction using the Pinnacle3™ convolution/superposition algorithm based treatment planning system (TPS). Method and Materials: A phantom with lung density material was constructed to investigate differences between dose calculated using the Pinnacle3™ TPS and dose delivered using an Elekta™ Synergy™ linear accelerator. The phantom set‐up was 4cm solid water then 4cm lung phantom material (Gammex), then either no bolus, 1cm bolus, or 2cm bolus; then 4cm solid water. Point doses were calculated by placing points of interest (POIs) along the beam central axis at various depths. All dose distributions were calculated using the Pinnacle3™ adaptive convolve (AC) algorithm, for a 10×10cm2 AP beam (6MV and/or 15MV) @ 100 SSD and 200MU prescription. Ion chamber and/or MOSFET measurements were performed between bolus slabs for the bolus containing phantoms and POIs were generated to obtain calculated dose for each dosimeter position. In addition, a MapCheck device was placed under each phantom to measure 2D dose distributions for comparison against the calculated 2D planar dose map. Results: Agreement between calculated and measured dose using ion chamber was within ±1% for 19/23 measurements with a maximum difference of 3.23%. MOSFET measurements showed good agreement, as all measurements were within 3%. Evaluation of planar dose distribution with the MapCheck yielded a pass rate ranging from 93.2% to 98.5% based on 2% difference and 2mm distance to agreement. Conclusion: Pinnacle3™ TPS dose calculations using tissue heterogeneity showed excellent agreement with dose measured in a heterogeneous phantom using 3 different dosimeters. The measurement plan presented represents a simple, efficient, and accurate means for commissioning heterogeneous dose calculation algorithms for clinical use.
AB - Purpose: To establish a measurement protocol for commissioning lung heterogeneity correction using the Pinnacle3™ convolution/superposition algorithm based treatment planning system (TPS). Method and Materials: A phantom with lung density material was constructed to investigate differences between dose calculated using the Pinnacle3™ TPS and dose delivered using an Elekta™ Synergy™ linear accelerator. The phantom set‐up was 4cm solid water then 4cm lung phantom material (Gammex), then either no bolus, 1cm bolus, or 2cm bolus; then 4cm solid water. Point doses were calculated by placing points of interest (POIs) along the beam central axis at various depths. All dose distributions were calculated using the Pinnacle3™ adaptive convolve (AC) algorithm, for a 10×10cm2 AP beam (6MV and/or 15MV) @ 100 SSD and 200MU prescription. Ion chamber and/or MOSFET measurements were performed between bolus slabs for the bolus containing phantoms and POIs were generated to obtain calculated dose for each dosimeter position. In addition, a MapCheck device was placed under each phantom to measure 2D dose distributions for comparison against the calculated 2D planar dose map. Results: Agreement between calculated and measured dose using ion chamber was within ±1% for 19/23 measurements with a maximum difference of 3.23%. MOSFET measurements showed good agreement, as all measurements were within 3%. Evaluation of planar dose distribution with the MapCheck yielded a pass rate ranging from 93.2% to 98.5% based on 2% difference and 2mm distance to agreement. Conclusion: Pinnacle3™ TPS dose calculations using tissue heterogeneity showed excellent agreement with dose measured in a heterogeneous phantom using 3 different dosimeters. The measurement plan presented represents a simple, efficient, and accurate means for commissioning heterogeneous dose calculation algorithms for clinical use.
UR - http://www.scopus.com/inward/record.url?scp=85024796169&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85024796169&partnerID=8YFLogxK
U2 - 10.1118/1.2962004
DO - 10.1118/1.2962004
M3 - Article
AN - SCOPUS:85024796169
VL - 35
SP - 2783
JO - Medical Physics
JF - Medical Physics
SN - 0094-2405
IS - 6
ER -