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Information Journal Paper

Title

A DOSIMETRIC STUDY OF DEEP SKIN ELECTRON THERAPY WITH OVERLAPPING STATIONARY RADIATION FIELDS – A CASE REPORT

Pages

  79-84

Abstract

 Background: For radiotherapy of total skin including sub‐cutaneous tissue up to a depth of 3 cm on the entire left leg of an adult (Angiosarcoma skin), a complex treatment with multiple stationary electron fields was planned at our clinic. The details of dosimetry, clinical dose measurements are presented. Materials and Methods: The treatment planned with 6 overlapping 9 MeV electron fields in Clinac 2300CD linac. With 25×25 cm cone, a cut‐out insert provided 56×30 cm field at FSD 213 cm, while patient lying on the floor. Dose distributions were checked using Kodak V densitometric film in cylindrical plastic can phantom. The calibration was carried out using solid water phantom, water equivalent IMRT phantom and water can leg phantom. A dose of 45 Gy in 23 fractions at 5 fractions/week was prescribed. 6 field overlapping field factor was measured by the method described for total body electron irradiation (AAPM). Skin doses were estimated at random selected points using TLD chips and semiconductor diodes.Results: Measured absorbed doses by three methods were 0.174 cGy/MU, 0.166 cGy/MU and 0.162 cGy/MU agreed well with the calculated value 0.163 cGy/MU.6 field overlap factor was 2.315. Clinical dose estimates of mean skin dose was 246.0±14 cGy (n=18), delivering higher dose by 23%.The gonad dose estimate under shield was<5%. The excess dose to skin delivered in first 14 fractions was adjusted in following 9 fractions.Conclusion: It appears that the excess dose in real situation may be due to either floor backscatier or non uniform overlap of dose from adjacent fields.

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    APA: Copy

    DAVIS, C.A., RAVICHANDRAN, R., BINUKUMAR, J.P., & EL GHAMRAWY, K.. (2015). A DOSIMETRIC STUDY OF DEEP SKIN ELECTRON THERAPY WITH OVERLAPPING STATIONARY RADIATION FIELDS – A CASE REPORT. INTERNATIONAL JOURNAL OF RADIATION RESEARCH, 13(1), 79-84. SID. https://sid.ir/paper/286643/en

    Vancouver: Copy

    DAVIS C.A., RAVICHANDRAN R., BINUKUMAR J.P., EL GHAMRAWY K.. A DOSIMETRIC STUDY OF DEEP SKIN ELECTRON THERAPY WITH OVERLAPPING STATIONARY RADIATION FIELDS – A CASE REPORT. INTERNATIONAL JOURNAL OF RADIATION RESEARCH[Internet]. 2015;13(1):79-84. Available from: https://sid.ir/paper/286643/en

    IEEE: Copy

    C.A. DAVIS, R. RAVICHANDRAN, J.P. BINUKUMAR, and K. EL GHAMRAWY, “A DOSIMETRIC STUDY OF DEEP SKIN ELECTRON THERAPY WITH OVERLAPPING STATIONARY RADIATION FIELDS – A CASE REPORT,” INTERNATIONAL JOURNAL OF RADIATION RESEARCH, vol. 13, no. 1, pp. 79–84, 2015, [Online]. Available: https://sid.ir/paper/286643/en

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