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Implementation and validation of a commercial portal dosimetry software for intensity-modulated radiation therapy pre-treatment verification.

Varatharaj C, Moretti E, Ravikumar M, Malisan MR, Supe SS, Padovani R - J Med Phys (2010)

Bottom Line: The mean γ values are found to be 0.42 (SD: 0.06) and 0.44 (SD: 0.06) for the EPIDose and MapCHECK(™), respectively.The average γ∆ for EPIDose and MapCHECK(™) are found as 0.51 (SD: 0.06) and 0.53 (SD: 0.07), respectively.Based on our results obtained with EPIDose and strong agreement with MapCHECK(™), we may conclude that the EPIDose portal dosimetry system has been successfully implemented and validated with our routine 2D array detector.

View Article: PubMed Central - PubMed

Affiliation: Department of Medical Physics, University Hospital, Udine - 33100, India.

ABSTRACT
Electronic portal imaging devices (EPIDs) are extensively used for obtaining dosimetric information of pre-treatment field verification and in-vivo dosimetry for intensity-modulated radiotherapy (IMRT). In the present study, we have implemented the newly developed portal dosimetry software using independent dose prediction algorithm EPIDose(™) and evaluated this new tool for the pre-treatment IMRT plan quality assurance of Whole Pelvis with Simultaneous Integrated Boost (WP-SIB-IMRT) of prostate cases by comparing with routine two-dimensional (2D) array detector system (MapCHECK(™)). We have investigated 104 split fields using γ -distributions in terms of predefined γ frequency parameters. The mean γ values are found to be 0.42 (SD: 0.06) and 0.44 (SD: 0.06) for the EPIDose and MapCHECK(™), respectively. The average γ∆ for EPIDose and MapCHECK(™) are found as 0.51 (SD: 0.06) and 0.53 (SD: 0.07), respectively. Furthermore, the percentage of points with γ < 1, γ < 1.5, and γ > 2 are 97.4%, 99.3%, and 0.56%, respectively for EPIDose and 96.4%, 99.0% and 0.62% for MapCHECK(™). Based on our results obtained with EPIDose and strong agreement with MapCHECK(™), we may conclude that the EPIDose portal dosimetry system has been successfully implemented and validated with our routine 2D array detector.

No MeSH data available.


Comparison of results between the EPIDose and TPS calculated one for a split field of a typical prostate case using 3 mm and 3% criteria. Comparison of profiles along the Y-axis is shown in the lower right window. The mean γ value and percentage of points with γ < 1 are 0.42 (SD: 0.06) and 100%, respectively
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Figure 0001: Comparison of results between the EPIDose and TPS calculated one for a split field of a typical prostate case using 3 mm and 3% criteria. Comparison of profiles along the Y-axis is shown in the lower right window. The mean γ value and percentage of points with γ < 1 are 0.42 (SD: 0.06) and 100%, respectively

Mentions: Figure 1shows a sample of comparison of measured dose maps using EPIDose™ with TPS calculated doses. The comparison of profiles along the Y-axis is shown in lower right window. A similar example of comparison between the MapCHECK ™ measured and TPS calculated doses is shown in Figure 2. The comparison between MapCHECK™ and EPIDose™ for a merged field (i.e., merging 2 split fields) is shown in Figure 3. The measured fields using EPIDose™ in terms of percentage of points with γ ≤ 1 resulted in well agreement with MapCHECK™ measured fields.


Implementation and validation of a commercial portal dosimetry software for intensity-modulated radiation therapy pre-treatment verification.

Varatharaj C, Moretti E, Ravikumar M, Malisan MR, Supe SS, Padovani R - J Med Phys (2010)

Comparison of results between the EPIDose and TPS calculated one for a split field of a typical prostate case using 3 mm and 3% criteria. Comparison of profiles along the Y-axis is shown in the lower right window. The mean γ value and percentage of points with γ < 1 are 0.42 (SD: 0.06) and 100%, respectively
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2990112&req=5

Figure 0001: Comparison of results between the EPIDose and TPS calculated one for a split field of a typical prostate case using 3 mm and 3% criteria. Comparison of profiles along the Y-axis is shown in the lower right window. The mean γ value and percentage of points with γ < 1 are 0.42 (SD: 0.06) and 100%, respectively
Mentions: Figure 1shows a sample of comparison of measured dose maps using EPIDose™ with TPS calculated doses. The comparison of profiles along the Y-axis is shown in lower right window. A similar example of comparison between the MapCHECK ™ measured and TPS calculated doses is shown in Figure 2. The comparison between MapCHECK™ and EPIDose™ for a merged field (i.e., merging 2 split fields) is shown in Figure 3. The measured fields using EPIDose™ in terms of percentage of points with γ ≤ 1 resulted in well agreement with MapCHECK™ measured fields.

Bottom Line: The mean γ values are found to be 0.42 (SD: 0.06) and 0.44 (SD: 0.06) for the EPIDose and MapCHECK(™), respectively.The average γ∆ for EPIDose and MapCHECK(™) are found as 0.51 (SD: 0.06) and 0.53 (SD: 0.07), respectively.Based on our results obtained with EPIDose and strong agreement with MapCHECK(™), we may conclude that the EPIDose portal dosimetry system has been successfully implemented and validated with our routine 2D array detector.

View Article: PubMed Central - PubMed

Affiliation: Department of Medical Physics, University Hospital, Udine - 33100, India.

ABSTRACT
Electronic portal imaging devices (EPIDs) are extensively used for obtaining dosimetric information of pre-treatment field verification and in-vivo dosimetry for intensity-modulated radiotherapy (IMRT). In the present study, we have implemented the newly developed portal dosimetry software using independent dose prediction algorithm EPIDose(™) and evaluated this new tool for the pre-treatment IMRT plan quality assurance of Whole Pelvis with Simultaneous Integrated Boost (WP-SIB-IMRT) of prostate cases by comparing with routine two-dimensional (2D) array detector system (MapCHECK(™)). We have investigated 104 split fields using γ -distributions in terms of predefined γ frequency parameters. The mean γ values are found to be 0.42 (SD: 0.06) and 0.44 (SD: 0.06) for the EPIDose and MapCHECK(™), respectively. The average γ∆ for EPIDose and MapCHECK(™) are found as 0.51 (SD: 0.06) and 0.53 (SD: 0.07), respectively. Furthermore, the percentage of points with γ < 1, γ < 1.5, and γ > 2 are 97.4%, 99.3%, and 0.56%, respectively for EPIDose and 96.4%, 99.0% and 0.62% for MapCHECK(™). Based on our results obtained with EPIDose and strong agreement with MapCHECK(™), we may conclude that the EPIDose portal dosimetry system has been successfully implemented and validated with our routine 2D array detector.

No MeSH data available.