Purpose: Postoperative intravaginal brachytherapy for endometrial carcinoma is usually performed with (192)Ir high-dose rate (HDR) afterloading. A potential alternative is treatment with a broadband 50kV X-ray point source, the advantage being its low energy and the consequential steep dose gradient. The aim of this study was to create and evaluate a homogeneous cylindrical energy deposition around a newly designed vaginal applicator. Methods and Materials: To create constant isodose layers along the cylindrical plastic vaginal applicator, the source (INTRABEAM system) was moved in steps of 17-19.5 mm outward from the tip of the applicator. Irradiation for a predetermined time was performed at each position. The axial shift was established by a stepping mechanism that was mounted on a table support. The total dose/dose distribution was determined using film dosimetry (Gafchromic EBT) in a "solid water" phantom. The films were evaluated with Mathematica 5.2 and OmniPro-I'mRT 1.6. The results (dose D0/D5/D10 in 0/5/10 mm tissue depth) were compared with an (192)Ir HDR afterloading plan for multiple sampling points around the applicator. Results: Three different dose distributions with lengths of 3.9-7.3 cm were created. The irradiation time based on the delivery of 5/7 Gy to a 5 mm tissue depth was 19/26 min to 27/38 min. D0/D5/D10 was 150%/100%/67% for electronic brachytherapy and 140%/100%/74% for the afterloading technique. The deviation for repeated measurements in the phantom was <7%. Conclusions: It is possible to create a homogeneous cylindrical dose distribution, similar to (192)Ir HDR afterloading, through the superimposition of multiple spherical dose distributions by stepping a kilovolt point source. (C) 2009 Elsevier Inc.
|Data di pubblicazione:||2009|
|Titolo:||A NOVEL DEVICE FOR INTRAVAGINAL ELECTRONIC BRACHYTHERAPY|
|Autore/i:||Schneider, F; Fuchs, H; Lorenz, F; Steil, V; Ziglio, F; Kraus-Tiefenbacher, U; Lohr, F; Wenz, F|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.ijrobp.2009.01.082|
|Codice identificativo ISI:||WOS:000267505000045|
|Codice identificativo Scopus:||2-s2.0-67649528940|
|Codice identificativo Pubmed:||19545794|
|Citazione:||A NOVEL DEVICE FOR INTRAVAGINAL ELECTRONIC BRACHYTHERAPY / Schneider, F; Fuchs, H; Lorenz, F; Steil, V; Ziglio, F; Kraus-Tiefenbacher, U; Lohr, F; Wenz, F. - In: INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS. - ISSN 0360-3016. - 74:4(2009), pp. 1298-1305.|
|Tipologia||Articolo su rivista|
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