Dosimetric analysis and comparison of IMRT and HDR brachytherapy in treatment of localized prostate cancer
Radical radiotherapy is one of the options for the management of prostate cancer. In external beam therapy, 3D conformal radiotherapy (3DCRT) and intensity modulated radiotherapy (IMRT) are the options for delivery of increased radiation dose, as vital organs are very close to the prostate and a hig...
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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2010-01-01
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| Series: | Journal of Medical Physics |
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| Online Access: | http://www.jmp.org.in/article.asp?issn=0971-6203;year=2010;volume=35;issue=2;spage=113;epage=119;aulast=Murali |
| _version_ | 1818284955132755968 |
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| author | Murali V Kurup P. G. G. Mahadev P Mahalakshmi S |
| author_facet | Murali V Kurup P. G. G. Mahadev P Mahalakshmi S |
| author_sort | Murali V |
| collection | DOAJ |
| description | Radical radiotherapy is one of the options for the management of prostate cancer. In external beam therapy, 3D conformal radiotherapy (3DCRT) and intensity modulated radiotherapy (IMRT) are the options for delivery of increased radiation dose, as vital organs are very close to the prostate and a higher dose to these structures leads to an increased toxicity. In brachytherapy, low dose rate brachytherapy with permanent implant of radioactive seeds and high dose rate brachytherapy (HDR) with remote after loaders are available. A dosimetric analysis has been made on IMRT and HDR brachytherapy plans. Ten cases from each IMRT and HDR brachytherapy have been taken for the study. The analysis includes comparison of conformity and homogeneity indices, D100, D95, D90, D80, D50, D10 and D5 of the target. For the organs at risk (OAR), namely rectum and bladder, V100, V90 and V50 are compared. In HDR brachytherapy, the doses to 1 cc and 0.1 cc of urethra have also been studied. Since a very high dose surrounds the source, the 300% dose volumes in the target and within the catheters are also studied in two plans, to estimate the actual volume of target receiving dose over 300%. This study shows that the prescribed dose covers 93 and 92% of the target volume in IMRT and HDR brachytherapy respectively. HDR brachytherapy delivers a much lesser dose to OAR, compared to the IMRT. For rectum, the V50 in IMRT is 34.0cc whilst it is 7.5cc in HDR brachytherapy. With the graphic optimization tool in HDR brachytherapy planning, the dose to urethra could be kept within 120% of the target dose. Hence it is concluded that HDR brachytherapy may be the choice of treatment for cancer of prostate in the early stage. |
| first_indexed | 2024-12-13T01:01:01Z |
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| id | doaj.art-ecb193806b5f4a30bedd703429ab265b |
| institution | Directory Open Access Journal |
| issn | 0971-6203 1998-3913 |
| language | English |
| last_indexed | 2024-12-13T01:01:01Z |
| publishDate | 2010-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Journal of Medical Physics |
| spelling | doaj.art-ecb193806b5f4a30bedd703429ab265b2022-12-22T00:04:41ZengWolters Kluwer Medknow PublicationsJournal of Medical Physics0971-62031998-39132010-01-01352113119Dosimetric analysis and comparison of IMRT and HDR brachytherapy in treatment of localized prostate cancerMurali VKurup P. G. G.Mahadev PMahalakshmi SRadical radiotherapy is one of the options for the management of prostate cancer. In external beam therapy, 3D conformal radiotherapy (3DCRT) and intensity modulated radiotherapy (IMRT) are the options for delivery of increased radiation dose, as vital organs are very close to the prostate and a higher dose to these structures leads to an increased toxicity. In brachytherapy, low dose rate brachytherapy with permanent implant of radioactive seeds and high dose rate brachytherapy (HDR) with remote after loaders are available. A dosimetric analysis has been made on IMRT and HDR brachytherapy plans. Ten cases from each IMRT and HDR brachytherapy have been taken for the study. The analysis includes comparison of conformity and homogeneity indices, D100, D95, D90, D80, D50, D10 and D5 of the target. For the organs at risk (OAR), namely rectum and bladder, V100, V90 and V50 are compared. In HDR brachytherapy, the doses to 1 cc and 0.1 cc of urethra have also been studied. Since a very high dose surrounds the source, the 300% dose volumes in the target and within the catheters are also studied in two plans, to estimate the actual volume of target receiving dose over 300%. This study shows that the prescribed dose covers 93 and 92% of the target volume in IMRT and HDR brachytherapy respectively. HDR brachytherapy delivers a much lesser dose to OAR, compared to the IMRT. For rectum, the V50 in IMRT is 34.0cc whilst it is 7.5cc in HDR brachytherapy. With the graphic optimization tool in HDR brachytherapy planning, the dose to urethra could be kept within 120% of the target dose. Hence it is concluded that HDR brachytherapy may be the choice of treatment for cancer of prostate in the early stage.http://www.jmp.org.in/article.asp?issn=0971-6203;year=2010;volume=35;issue=2;spage=113;epage=119;aulast=MuraliBrachytherapyconformityintensity modulated radiotherapyprostate |
| spellingShingle | Murali V Kurup P. G. G. Mahadev P Mahalakshmi S Dosimetric analysis and comparison of IMRT and HDR brachytherapy in treatment of localized prostate cancer Journal of Medical Physics Brachytherapy conformity intensity modulated radiotherapy prostate |
| title | Dosimetric analysis and comparison of IMRT and HDR brachytherapy in treatment of localized prostate cancer |
| title_full | Dosimetric analysis and comparison of IMRT and HDR brachytherapy in treatment of localized prostate cancer |
| title_fullStr | Dosimetric analysis and comparison of IMRT and HDR brachytherapy in treatment of localized prostate cancer |
| title_full_unstemmed | Dosimetric analysis and comparison of IMRT and HDR brachytherapy in treatment of localized prostate cancer |
| title_short | Dosimetric analysis and comparison of IMRT and HDR brachytherapy in treatment of localized prostate cancer |
| title_sort | dosimetric analysis and comparison of imrt and hdr brachytherapy in treatment of localized prostate cancer |
| topic | Brachytherapy conformity intensity modulated radiotherapy prostate |
| url | http://www.jmp.org.in/article.asp?issn=0971-6203;year=2010;volume=35;issue=2;spage=113;epage=119;aulast=Murali |
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