Empirical formula for the prediction of off axis ratios and isodose curves for a treatment planning system
A mathematical model has been developed for prediction of off axis ratio (OAR), using Wood - Saxon term used to represent nuclear potential. This method has been satisfactorily applied for predicting OAR in case of <sup>60</sup>Co γ -rays and high energy X-rays. Investigations...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wolters Kluwer Medknow Publications
2006-01-01
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| Series: | Journal of Medical Physics |
| Subjects: | |
| Online Access: | http://www.jmp.org.in/article.asp?issn=0971-6203;year=2006;volume=31;issue=4;spage=262;epage=268;aulast=Pal |
| _version_ | 1811237660638838784 |
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| author | Pal Surajit Ravishankar R Sharma R Muthukrishnan G Ray Dilip Roy S Srivastava D |
| author_facet | Pal Surajit Ravishankar R Sharma R Muthukrishnan G Ray Dilip Roy S Srivastava D |
| author_sort | Pal Surajit |
| collection | DOAJ |
| description | A mathematical model has been developed for prediction of off axis ratio (OAR), using Wood - Saxon term used to represent nuclear potential. This method has been satisfactorily applied for predicting OAR in case of <sup>60</sup>Co γ -rays and high energy X-rays. Investigations are considered upto a depth of 25 cm in the case of 4MV LINAC for which measurements were carried out in our laboratory using indigenously developed Radiation Field Analyzer. For 60Co γ-rays as well as 6 and 18MV LINAC beams we could get off-axis profiles only upto 20 cm. The shift δ between measured and predicted OAR is within ±2 mm except for 20 cm depth near the falling edge of the penumbra, where it is 2.80 mm. Software has been developed in Visual Basic 6 on Windows platform to plot Isodose curves, which is based on the mathematical modeling of OAR and central axis percentage depth dose. |
| first_indexed | 2024-04-12T12:27:05Z |
| format | Article |
| id | doaj.art-f76fd1ab515b4606b49c46faafefe761 |
| institution | Directory Open Access Journal |
| issn | 0971-6203 |
| language | English |
| last_indexed | 2024-04-12T12:27:05Z |
| publishDate | 2006-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Journal of Medical Physics |
| spelling | doaj.art-f76fd1ab515b4606b49c46faafefe7612022-12-22T03:33:08ZengWolters Kluwer Medknow PublicationsJournal of Medical Physics0971-62032006-01-01314262268Empirical formula for the prediction of off axis ratios and isodose curves for a treatment planning systemPal SurajitRavishankar RSharma RMuthukrishnan GRay DilipRoy SSrivastava DA mathematical model has been developed for prediction of off axis ratio (OAR), using Wood - Saxon term used to represent nuclear potential. This method has been satisfactorily applied for predicting OAR in case of <sup>60</sup>Co γ -rays and high energy X-rays. Investigations are considered upto a depth of 25 cm in the case of 4MV LINAC for which measurements were carried out in our laboratory using indigenously developed Radiation Field Analyzer. For 60Co γ-rays as well as 6 and 18MV LINAC beams we could get off-axis profiles only upto 20 cm. The shift δ between measured and predicted OAR is within ±2 mm except for 20 cm depth near the falling edge of the penumbra, where it is 2.80 mm. Software has been developed in Visual Basic 6 on Windows platform to plot Isodose curves, which is based on the mathematical modeling of OAR and central axis percentage depth dose.http://www.jmp.org.in/article.asp?issn=0971-6203;year=2006;volume=31;issue=4;spage=262;epage=268;aulast=PalIsodose curvesoff-axis ratiopercentage depth dosetreatment planning |
| spellingShingle | Pal Surajit Ravishankar R Sharma R Muthukrishnan G Ray Dilip Roy S Srivastava D Empirical formula for the prediction of off axis ratios and isodose curves for a treatment planning system Journal of Medical Physics Isodose curves off-axis ratio percentage depth dose treatment planning |
| title | Empirical formula for the prediction of off axis ratios and isodose curves for a treatment planning system |
| title_full | Empirical formula for the prediction of off axis ratios and isodose curves for a treatment planning system |
| title_fullStr | Empirical formula for the prediction of off axis ratios and isodose curves for a treatment planning system |
| title_full_unstemmed | Empirical formula for the prediction of off axis ratios and isodose curves for a treatment planning system |
| title_short | Empirical formula for the prediction of off axis ratios and isodose curves for a treatment planning system |
| title_sort | empirical formula for the prediction of off axis ratios and isodose curves for a treatment planning system |
| topic | Isodose curves off-axis ratio percentage depth dose treatment planning |
| url | http://www.jmp.org.in/article.asp?issn=0971-6203;year=2006;volume=31;issue=4;spage=262;epage=268;aulast=Pal |
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