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Helical tomotherapy setup variations in canine nasal tumor patients immobilized with a bite block.

Authors :
Kubicek LN
Seo S
Chappell RJ
Jeraj R
Forrest LJ
Source :
Veterinary radiology & ultrasound : the official journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association [Vet Radiol Ultrasound] 2012 Jul-Aug; Vol. 53 (4), pp. 474-81. Date of Electronic Publication: 2012 Jun 25.
Publication Year :
2012

Abstract

The purpose of our study was to compare setup variation in four degrees of freedom (vertical, longitudinal, lateral, and roll) between canine nasal tumor patients immobilized with a mattress and bite block, versus a mattress alone. Our secondary aim was to define a clinical target volume (CTV) to planning target volume (PTV) expansion margin based on our mean systematic error values associated with nasal tumor patients immobilized by a mattress and bite block. We evaluated six parameters for setup corrections: systematic error, random error, patient-patient variation in systematic errors, the magnitude of patient-specific random errors (root mean square [RMS]), distance error, and the variation of setup corrections from zero shift. The variations in all parameters were statistically smaller in the group immobilized by a mattress and bite block. The mean setup corrections in the mattress and bite block group ranged from 0.91 mm to 1.59 mm for the translational errors and 0.5°. Although most veterinary radiation facilities do not have access to Image-guided radiotherapy (IGRT), we identified a need for more rigid fixation, established the value of adding IGRT to veterinary radiation therapy, and define the CTV-PTV setup error margin for canine nasal tumor patients immobilized in a mattress and bite block.<br /> (© 2012 Veterinary Radiology & Ultrasound.)

Details

Language :
English
ISSN :
1058-8183
Volume :
53
Issue :
4
Database :
MEDLINE
Journal :
Veterinary radiology & ultrasound : the official journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association
Publication Type :
Academic Journal
Accession number :
22731939
Full Text :
https://doi.org/10.1111/j.1740-8261.2012.01947.x