Evaluation of dosimetry effect of lack of side-scatter volume on large field measurements with a MapCheck detector array

Pan MA; Jianrong DAI; Weijie CUI

doi:10.13538/j.1001-8042/nst.20.292-296

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Evaluation of dosimetry effect of lack of side-scatter volume on large field measurements with a MapCheck detector array

RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE | Updated：2021-01-29

- Evaluation of dosimetry effect of lack of side-scatter volume on large field measurements with a MapCheck detector array
- Nuclear Science and Techniques Vol. 20, Issue 5, (2009)
- Affiliations：
  
  1.Department of Radiation Oncology/Cancer Institute, Chinese Academy of Medical Sciences, Beijing 100021, China
- Author bio：
  
  Corresponding author. E-mail address: dai_jianrong@163.com
  
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- DOI：10.13538/j.1001-8042/nst.20.292-296 CLC：
- Published：20 October 2009，
  
  Received：13 February 2009，
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Cite this article
Pan MA, Jianrong DAI, Weijie CUI. Evaluation of dosimetry effect of lack of side-scatter volume on large field measurements with a MapCheck detector array. [J]. Nuclear Science and Techniques 20(5):292-296(2009)
DOI：

Pan MA, Jianrong DAI, Weijie CUI. Evaluation of dosimetry effect of lack of side-scatter volume on large field measurements with a MapCheck detector array. [J]. Nuclear Science and Techniques 20(5):292-296(2009) DOI： 10.13538/j.1001-8042/nst.20.292-296.

Evaluation of dosimetry effect of lack of side-scatter volume on large field measurements with a MapCheck detector array 1 first-author 1 corresp Corresponding author. E-mail address: dai_jianrong@163.com Corresponding author. E-mail address: dai_jianrong@163.com dai_jianrong@163.com 1 Department of Radiation Oncology/Cancer Institute, Chinese Academy of Medical Sciences, Beijing 100021, China Department of Radiation Oncology/Cancer Institute, Chinese Academy of Medical Sciences, Beijing 100021, China In this paper, we describe a quantitative evaluation of the dosimetry effect of lack of side-scatter volume (LSSV). MapCheck, an integration diode array, was used to measure dose maps for three large non-IMRT fields (30cm ×30 cm and 40 cm×40 cm open fields, and 30 cm×30 cm wedge field with wedge angle of 60°) and 19 large IMRT fields. For each field, measurement was performed twice, under the conditions of (1) full scatter volume and (2) LSSV. Condition 1 was satisfied by adding PMMA slabs against the side of the MapCheck, and Condition 2, without PMMA slabs. The measured dose maps were compared with pass rate and their difference was scored when the acceptance criterion was set to 0.5%, 1%, 2%, 3%, etc. For very large open fields, the effect of LSSV may be clinically significant, while for large wedge fields and IMRT fields, the effect is negligible. Large field Lack of side-scatter volume Diode array References LUO Wei , LI Jinsheng , Price Robert A , et al . Med Phys , 2006 , 33 : 2557 - 2564 . Med Phys YAN Yulong , Papanikolaou Nikos , WENG Xuejun , et al . Med Phys , 2005 , 32 : 1566 - 1570 . Med Phys Chen X , Yue N J , Chen W , et al . Phys Med Biol , 2005 , 50 : 2641 - 2645 . Phys Med Biol Winkler P , Zurl B , Guss H , et al . Phys Med Biol , 2005 , 50 : 643 - 654 . Phys Med Biol XING Lei , Li J G . Med Phys , 2000 , 27 ( 9 ): 1566 - 1570 . Med Phys Higgins P D , Alaei P , Gerbi B J , et al . Med Phys , 2003 , 30 : 3118 - 3123 . Med Phys Charland M P , Chetty I J , Yokoyama S , et al . J Appl Clin Med Phys , 2003 , 4 : 25 - 39 . J Appl Clin Med Phys Arthur J . Olch Med Phys , 2002 , 29 : 2159 - 2168 . Olch Med Phys YANG Y , XING L . Phys Med Biol , 2004 , 49 : 1521 - 1533 . Phys Med Biol Buonamici F B , Compagnucci A , Marrazzo L , et al . Med Phys , 2007 , 34 : 1372 - 1379 . Med Phys Letourneau D , Gulam M , YAN D , et al . Radiother Oncol , 2004 , 70 : 199 - 206 . Radiother Oncol Jursinic P A , Nelms B E . Med Phys , 2003 , 30 : 870 - 879 . Med Phys IAEA . Technical Reports Series No. 277 , Vienna , 1987 . Technical Reports Series No. 277 Sun Nuclear Corporation . MapCheck user guide Melbourne (FL) , 2004 . MapCheck user guide Melbourne (FL) Nelms B E , Simon J A . J Appl Clin Med Phys , 2007 , 8 : 2448 . J Appl Clin Med Phys 10.13538/j.1001-8042/nst.20.292-296 2009-02-13 2009-10-20 2021-01-19 2009 Nuclear Science and Techniques 05 20

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