Geometrical uncertainty margins in 3D conformal radiotherapy in the pediatric age group
Joint Authors
Zaghlul, Muhammad S.
al-Debawy, Iman
al-Dasuqi, Ismail
Ata Allah, Ihab M.
Source
Journal of the Egyptian National Cancer Institute
Issue
Vol. 23, Issue 2 (30 Jun. 2011), pp.55-60, 6 p.
Publisher
Cairo University National Cancer Institute
Publication Date
2011-06-30
Country of Publication
Egypt
No. of Pages
6
Main Subjects
Topics
Abstract EN
Purpose : to evaluate set-up variation of pediatric patients undergoing 3D conformal radiotherapy (3DCRT) using electronic portal image device (EPID), in an effort to evaluate the adequacy of the planning target volume (PTV) margin employed for the 3DCRT treatment of pediatric patients.
Materials and methods : Set-up data was collected from 48 pediatric patients treated with 3DCRT for head and neck (31 patients), abdomen-pelvic (9 patients) and chest (8 patients) sites during the period between September 2008 and February 2009.
A total of 358 images obtained by EPID were analyzed.
The mean (M) and standard deviation (SD) for systematic and random errors were calculated and the results were analyzed.
Results : All images were studied in anterior and lateral portals.
The systematic errors along longitudinal, lateral and vertical directions in all patients showed an Mequal to 1.9, 1.6, and 1.6 mm with SD of 1.8, 1.4, and 1.8 mm, respectively ; (head and neck cases : Mequal to 1.5, 1.2, and 1.6 mm with SD 1.4, 1.2, and 1.8 mm ; chest cases : M equal to 2.5, 1.8, and 0.8 mm with SD 2.7, 1.7, and 1.2 mm, abdomen-pelvic cases : Mequal to 2.9, 2.8 and 2.3 mm with SD 1.6, 1.2, and 2.3 mm).
Similarly, the random errors for all patients showed SD of 1.9, 1.6, and 1.8 mm, respectively (head and neck cases : SD 1.7, 1.3, and 1.5 mm ; chest cases : SD 1.2, 1.9, and 2.5 mm ; abdomino-pelvic cases SD 2.5, 2, and 2.4 mm, respectively).
Using Van Herk’s formula the suggested (PTV) margin around the clinical target volume (CTV) of 5.5 mm appears to be adequate.
American Psychological Association (APA)
al-Debawy, Iman& Ata Allah, Ihab M.& al-Dasuqi, Ismail& Zaghlul, Muhammad S.. 2011. Geometrical uncertainty margins in 3D conformal radiotherapy in the pediatric age group. Journal of the Egyptian National Cancer Institute،Vol. 23, no. 2, pp.55-60.
https://search.emarefa.net/detail/BIM-282847
Modern Language Association (MLA)
al-Dasuqi, Ismail…[et al.]. Geometrical uncertainty margins in 3D conformal radiotherapy in the pediatric age group. Journal of the Egyptian National Cancer Institute Vol. 23, no. 2 (Jun. 2011), pp.55-60.
https://search.emarefa.net/detail/BIM-282847
American Medical Association (AMA)
al-Debawy, Iman& Ata Allah, Ihab M.& al-Dasuqi, Ismail& Zaghlul, Muhammad S.. Geometrical uncertainty margins in 3D conformal radiotherapy in the pediatric age group. Journal of the Egyptian National Cancer Institute. 2011. Vol. 23, no. 2, pp.55-60.
https://search.emarefa.net/detail/BIM-282847
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 59-60
Record ID
BIM-282847