Prostate Intrafraction Translation Margins for Real-Time Monitoring and Correction Strategies
The purpose of this work is to determine appropriate radiation therapy beam margins to account for intrafraction prostate translations for use with real-time electromagnetic position monitoring and correction strategies. Motion was measured continuously in 35 patients over 1157 fractions at 5 instit...
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2012-01-01
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| Series: | Prostate Cancer |
| Online Access: | http://dx.doi.org/10.1155/2012/130579 |
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| _version_ | 1850175512908922880 |
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| author | Dale W. Litzenberg James M. Balter Scott W. Hadley Daniel A. Hamstra Twyla R. Willoughby Patrick A. Kupelian Toufik Djemil Arul Mahadevan Shirish Jani Geoffrey Weinstein Timothy Solberg Charles Enke Lisa Levine Howard M. Sandler |
| author_facet | Dale W. Litzenberg James M. Balter Scott W. Hadley Daniel A. Hamstra Twyla R. Willoughby Patrick A. Kupelian Toufik Djemil Arul Mahadevan Shirish Jani Geoffrey Weinstein Timothy Solberg Charles Enke Lisa Levine Howard M. Sandler |
| author_sort | Dale W. Litzenberg |
| collection | DOAJ |
| description | The purpose of this work is to determine appropriate radiation therapy beam margins to account for intrafraction prostate translations for use with real-time electromagnetic position monitoring and correction strategies. Motion was measured continuously in 35 patients over 1157 fractions at 5 institutions. This data was studied using van Herk's formula of (αΣ+γσ') for situations ranging from no electromagnetic guidance to automated real-time corrections. Without electromagnetic guidance, margins of over 10 mm are necessary to ensure 95% dosimetric coverage while automated electromagnetic guidance allows the margins necessary for intrafraction translations to be reduced to submillimeter levels. Factors such as prostate deformation and rotation, which are not included in this analysis, will become the dominant concerns as margins are reduced. Continuous electromagnetic monitoring and automated correction have the potential to reduce prostate margins to 2-3 mm, while ensuring that a higher percentage of patients (99% versus 90%) receive a greater percentage (99% versus 95%) of the prescription dose. |
| format | Article |
| id | doaj-art-bfb5eaaf507e4008865d6ed299b74786 |
| institution | OA Journals |
| issn | 2090-3111 2090-312X |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Prostate Cancer |
| spelling | doaj-art-bfb5eaaf507e4008865d6ed299b747862025-08-20T02:19:26ZengWileyProstate Cancer2090-31112090-312X2012-01-01201210.1155/2012/130579130579Prostate Intrafraction Translation Margins for Real-Time Monitoring and Correction StrategiesDale W. Litzenberg0James M. Balter1Scott W. Hadley2Daniel A. Hamstra3Twyla R. Willoughby4Patrick A. Kupelian5Toufik Djemil6Arul Mahadevan7Shirish Jani8Geoffrey Weinstein9Timothy Solberg10Charles Enke11Lisa Levine12Howard M. Sandler13Department of Radiation Oncology, University of Michigan Health System, Ann Arbor, MI 48109-5010, USADepartment of Radiation Oncology, University of Michigan Health System, Ann Arbor, MI 48109-5010, USADepartment of Radiation Oncology, University of Michigan Health System, Ann Arbor, MI 48109-5010, USADepartment of Radiation Oncology, University of Michigan Health System, Ann Arbor, MI 48109-5010, USAM. D. Anderson Cancer Center Orlando, Orlando, FL 32806, USAUCLA, Los Angeles, CA 90095, USACleveland Clinic Foundation, Cleveland, OH 44195, USACleveland Clinic Foundation, Cleveland, OH 44195, USASharp Health Care Hospital, San Diego, CA 92123, USASharp Health Care Hospital, San Diego, CA 92123, USAUniversity of Texas Southwestern Medical Center, Dallas, TX 75390, USANebraska Medical Center, Omaha, NE 68198, USACalypso Medical Technologies Inc., Seattle, WA 98121, USACedars-Sinai, Los Angeles, CA 90048, USAThe purpose of this work is to determine appropriate radiation therapy beam margins to account for intrafraction prostate translations for use with real-time electromagnetic position monitoring and correction strategies. Motion was measured continuously in 35 patients over 1157 fractions at 5 institutions. This data was studied using van Herk's formula of (αΣ+γσ') for situations ranging from no electromagnetic guidance to automated real-time corrections. Without electromagnetic guidance, margins of over 10 mm are necessary to ensure 95% dosimetric coverage while automated electromagnetic guidance allows the margins necessary for intrafraction translations to be reduced to submillimeter levels. Factors such as prostate deformation and rotation, which are not included in this analysis, will become the dominant concerns as margins are reduced. Continuous electromagnetic monitoring and automated correction have the potential to reduce prostate margins to 2-3 mm, while ensuring that a higher percentage of patients (99% versus 90%) receive a greater percentage (99% versus 95%) of the prescription dose.http://dx.doi.org/10.1155/2012/130579 |
| spellingShingle | Dale W. Litzenberg James M. Balter Scott W. Hadley Daniel A. Hamstra Twyla R. Willoughby Patrick A. Kupelian Toufik Djemil Arul Mahadevan Shirish Jani Geoffrey Weinstein Timothy Solberg Charles Enke Lisa Levine Howard M. Sandler Prostate Intrafraction Translation Margins for Real-Time Monitoring and Correction Strategies Prostate Cancer |
| title | Prostate Intrafraction Translation Margins for Real-Time Monitoring and Correction Strategies |
| title_full | Prostate Intrafraction Translation Margins for Real-Time Monitoring and Correction Strategies |
| title_fullStr | Prostate Intrafraction Translation Margins for Real-Time Monitoring and Correction Strategies |
| title_full_unstemmed | Prostate Intrafraction Translation Margins for Real-Time Monitoring and Correction Strategies |
| title_short | Prostate Intrafraction Translation Margins for Real-Time Monitoring and Correction Strategies |
| title_sort | prostate intrafraction translation margins for real time monitoring and correction strategies |
| url | http://dx.doi.org/10.1155/2012/130579 |
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