Application of MOSkin detector for in vivo dosimetry on total skin electron therapy (TSET). (20th February 2018)

• Record Type: Journal Article
• Authors: Choi, J H; Cutajar, D; Metcalfe, P; Downes, S
• Is Part Of: Biomedical physics & engineering express. Volume 4:Number 2(2018)
• Publication Date: 2018-02-20
• Subjects: MOSkin -- MOSFET -- Total Skin Electron Therapy (TSET) -- electron beam -- skin dose -- in vivo dosimetry; Medical physics -- Periodicals; Biophysics -- Periodicals; Biomedical engineering -- Periodicals; Medical sciences -- Periodicals; 610.153
• DOI: 10.1088/2057-1976/aaac61
• Languages: English
• ISSNs: 2057-1976

Abstract

Abstract: Currently, TLDs and Gafchromic EBT3 film are commonly used for skin dose measurement during Total Skin Electron Therapy. However, measurements using these dosimeters are time consuming due to post-irradiation processing requirements. The MO Skin has advantages of being a small physical size with a 0.55 μ m thick gate oxide and a water equivalent depth of 0.07 mm while providing real-time dosimetry. Measurements of the MO Skin 's dosimetric characteristics were performed using a 6 MeV electron beam with an Elekta Infinity linear accelerator. For the TSET measurements, doses measured with the MO Skin were directly compared to TLDs and Gafchromic EBT3 film using a 6 MeV high dose rate electron beam. A 6 mm Perspex spoiler was placed and aligned perpendicularly to the beam in order to lower the effective beam energy and improve dose homogeneity. The MO Skin showed good dose linearity (R 2 = 0.9986) and dose rate independence for a 6 MeV electron beam and behaved very similarly to the other types of dosimeters that are commonly used in vivo dosimetry. For the TSET measurements, all three detector types showed a very similar trend of dose readings over the range of measurement points. Therefore, the MO Skin is an effective skin dosimeter for TSET dosimetry.