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A generalized calibration procedure for in vivo transit dosimetry using siemens electronic portal imaging devices

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A generalized calibration procedure for in vivo transit dosimetry using siemens electronic portal imaging devices

Content Provider	Springer Nature Link
Author	Fidanzio, Andrea Greco, Francesca Gargiulo, Laura Cilla, Savi Sabati, Domenico Cappiello, Massimo Felice, Cinzia Castro, Elisabetta Azario, Luigi Russo, Mariateresa Pompei, Lucia D’Ofrio, Guido Piermattei, Angelo
Copyright Year	2010
Abstract	A practical and accurate generalized in vivo dosimetry procedure has been implemented for Siemens linacs supplying 6, 10, and 15 MV photon beams, equipped with aSi electronic portal imaging devices (EPIDs). The in vivo dosimetry method makes use of correlation ratios between EPID transit signal, s t0(TPR,w,L), and phantom mid-plane dose, D $^{0}$(TPR,w,L), as functions of phantom thickness, w, square field dimensions, L, and tissue-phantom ratio TPR$_{20,10}$. The s t0(TPR,w,L) and D $^{0}$(TPR,w,L) values were defined to be independent of the EPID sensitivity and monitor unit calibration, while their dependence on TPR$_{20,10}$ was investigated to determine a set of generalized correlation ratios to be used for beams with TPR$_{20,10}$ falling in the examined range. This way, other radiotherapy centers can use the method with no need to locally perform the whole set of measurements in solid water phantoms, required to implement it. Tolerance levels for 3D conformal treatments, ranging between ±5 and ±6% according to tumor type and location, were estimated for comparison purposes between reconstructed isocenter dose, D $_{iso}$, and treatment planning system (TPS) computed dose D $_{iso,TPS}$. Finally a dedicated software, interfaceable with record and verify (R&V) systems used in the centers, was developed to obtain in vivo dosimetry results in less than 2 min after beam delivery.
Starting Page	373
Ending Page	383
Page Count	11
File Format	PDF
ISSN	01400118
Journal	Medical and Biological Engineering and Computing
Volume Number	49
Issue Number	3
e-ISSN	17410444
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-11-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	aSi EPID In vivo dosimetry Radiotherapy Computer Applications Human Physiology Imaging Radiology Biomedical Engineering
Content Type	Text
Resource Type	Article
Subject	Biomedical Engineering Computer Science Applications

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A generalized calibration procedure for in vivo transit dosimetry using siemens electronic portal imaging devices

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