Dose distribution near thin titanium plate for skull fixation irradiated by a 4-MV photon beam
To investigate the effects of scattered radiation when a thin titanium plate (thickness, 0.05 cm) used for skull fixation in cerebral nerve surgery is irradiated by a 4-MV photon beam. We investigated the dose distribution of radiation inside a phantom that simulates a human head fitted with a thin...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wolters Kluwer Medknow Publications
2010-01-01
|
| Series: | Journal of Medical Physics |
| Subjects: | |
| Online Access: | http://www.jmp.org.in/article.asp?issn=0971-6203;year=2010;volume=35;issue=2;spage=81;epage=87;aulast=Shimozato |
| _version_ | 1819054572032753664 |
|---|---|
| author | Shimozato Tomohiro Yasui Keisuke Kawanami Ryota Habara Kousaku Aoyama Yuichi Tabushi Katsuyoshi Obata Yasunori |
| author_facet | Shimozato Tomohiro Yasui Keisuke Kawanami Ryota Habara Kousaku Aoyama Yuichi Tabushi Katsuyoshi Obata Yasunori |
| author_sort | Shimozato Tomohiro |
| collection | DOAJ |
| description | To investigate the effects of scattered radiation when a thin titanium plate (thickness, 0.05 cm) used for skull fixation in cerebral nerve surgery is irradiated by a 4-MV photon beam. We investigated the dose distribution of radiation inside a phantom that simulates a human head fitted with a thin titanium plate used for post-surgery skull fixation and compared the distribution data measured using detectors, obtained by Monte Carlo (MC) simulations, and calculated using a radiation treatment planning system (TPS). Simulations were shown to accurately represent measured values. The effects of scattered radiation produced by high-Z materials such as titanium are not sufficiently considered currently in TPS dose calculations. Our comparisons show that the dose distribution is affected by scattered radiation around a thin high-Z material. The depth dose is measured and calculated along the central beam axis inside a water phantom with thin titanium plates at various depths. The maximum relative differences between simulation and TPS results on the entrance and exit sides of the plate were 23.1% and − 12.7%, respectively. However, the depth doses do not change in regions deeper than the plate in water. Although titanium is a high-Z material, if the titanium plate used for skull fixation in cerebral nerve surgery is thin, there is a slight change in the dose distribution in regions away from the plate. In addition, we investigated the effects of variation of photon energies, sizes of radiation field and thickness of the plate. When the target to be irradiated is far from the thin titanium plate, the dose differs little from what it would be in the absence of a plate, though the dose escalation existed in front of the metal plate. |
| first_indexed | 2024-12-21T12:53:45Z |
| format | Article |
| id | doaj.art-4f5461cde3c2405aa32e308b98d7106e |
| institution | Directory Open Access Journal |
| issn | 0971-6203 1998-3913 |
| language | English |
| last_indexed | 2024-12-21T12:53:45Z |
| publishDate | 2010-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Journal of Medical Physics |
| spelling | doaj.art-4f5461cde3c2405aa32e308b98d7106e2022-12-21T19:03:24ZengWolters Kluwer Medknow PublicationsJournal of Medical Physics0971-62031998-39132010-01-013528187Dose distribution near thin titanium plate for skull fixation irradiated by a 4-MV photon beamShimozato TomohiroYasui KeisukeKawanami RyotaHabara KousakuAoyama YuichiTabushi KatsuyoshiObata YasunoriTo investigate the effects of scattered radiation when a thin titanium plate (thickness, 0.05 cm) used for skull fixation in cerebral nerve surgery is irradiated by a 4-MV photon beam. We investigated the dose distribution of radiation inside a phantom that simulates a human head fitted with a thin titanium plate used for post-surgery skull fixation and compared the distribution data measured using detectors, obtained by Monte Carlo (MC) simulations, and calculated using a radiation treatment planning system (TPS). Simulations were shown to accurately represent measured values. The effects of scattered radiation produced by high-Z materials such as titanium are not sufficiently considered currently in TPS dose calculations. Our comparisons show that the dose distribution is affected by scattered radiation around a thin high-Z material. The depth dose is measured and calculated along the central beam axis inside a water phantom with thin titanium plates at various depths. The maximum relative differences between simulation and TPS results on the entrance and exit sides of the plate were 23.1% and − 12.7%, respectively. However, the depth doses do not change in regions deeper than the plate in water. Although titanium is a high-Z material, if the titanium plate used for skull fixation in cerebral nerve surgery is thin, there is a slight change in the dose distribution in regions away from the plate. In addition, we investigated the effects of variation of photon energies, sizes of radiation field and thickness of the plate. When the target to be irradiated is far from the thin titanium plate, the dose differs little from what it would be in the absence of a plate, though the dose escalation existed in front of the metal plate.http://www.jmp.org.in/article.asp?issn=0971-6203;year=2010;volume=35;issue=2;spage=81;epage=87;aulast=ShimozatoMonte Carlo simulationphoton beamradiation treatment planning systemscattered radiationtitanium plate |
| spellingShingle | Shimozato Tomohiro Yasui Keisuke Kawanami Ryota Habara Kousaku Aoyama Yuichi Tabushi Katsuyoshi Obata Yasunori Dose distribution near thin titanium plate for skull fixation irradiated by a 4-MV photon beam Journal of Medical Physics Monte Carlo simulation photon beam radiation treatment planning system scattered radiation titanium plate |
| title | Dose distribution near thin titanium plate for skull fixation irradiated by a 4-MV photon beam |
| title_full | Dose distribution near thin titanium plate for skull fixation irradiated by a 4-MV photon beam |
| title_fullStr | Dose distribution near thin titanium plate for skull fixation irradiated by a 4-MV photon beam |
| title_full_unstemmed | Dose distribution near thin titanium plate for skull fixation irradiated by a 4-MV photon beam |
| title_short | Dose distribution near thin titanium plate for skull fixation irradiated by a 4-MV photon beam |
| title_sort | dose distribution near thin titanium plate for skull fixation irradiated by a 4 mv photon beam |
| topic | Monte Carlo simulation photon beam radiation treatment planning system scattered radiation titanium plate |
| url | http://www.jmp.org.in/article.asp?issn=0971-6203;year=2010;volume=35;issue=2;spage=81;epage=87;aulast=Shimozato |
| work_keys_str_mv | AT shimozatotomohiro dosedistributionnearthintitaniumplateforskullfixationirradiatedbya4mvphotonbeam AT yasuikeisuke dosedistributionnearthintitaniumplateforskullfixationirradiatedbya4mvphotonbeam AT kawanamiryota dosedistributionnearthintitaniumplateforskullfixationirradiatedbya4mvphotonbeam AT habarakousaku dosedistributionnearthintitaniumplateforskullfixationirradiatedbya4mvphotonbeam AT aoyamayuichi dosedistributionnearthintitaniumplateforskullfixationirradiatedbya4mvphotonbeam AT tabushikatsuyoshi dosedistributionnearthintitaniumplateforskullfixationirradiatedbya4mvphotonbeam AT obatayasunori dosedistributionnearthintitaniumplateforskullfixationirradiatedbya4mvphotonbeam |