SU-E-T-115: A Novel Cylindrical 3D Water Scanner for Beam Data Collection: II. Dosimetric Characteristics

Medical Physics
J LiC Liu

Abstract

To study the dosimetric characteristics of a commercial three-dimensional water scanner (3D SCANNER, Sun Nuclear Corp). The novel cylindrical scanner uses a compact electrometer mounted on the side of the tank, eliminating the need for chamber extension cables. The electrometer has a wide dynamic range, requiring no gain adjustment as scanning conditions change, e.g., field size, dose rate, wedge field, etc. Measurements from the 3D SCANNER were compared against those from another commercial scanner (Blue Phantom, IBA Dosimetry). Comparable collection intervals and scanning speeds were used on both systems. Profile and depth measurements were performed for open field beams (6 and 18 MV; 10-cm and 30-cm squared fields; depths of dmax, 10, and 30 cm) and wedged fields (6 and 18 MV; 30-cm squared field; depth of 10 cm). Electron beam profile and depth measurements were performed for a 20-cm squared applicator (6, 12, and 20 MeV; depth of dmax). The root mean square (RMS) values were determined for each scanner's measurements. The measured field sizes were within 0.06 cm and 0.05 cm for photon and electron beams, respectively. The photon D10/D20 ratios differed by < 0.4% and the electron I50 values were within 0.02 cm. The RMS of t...Continue Reading

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