Journal of Medical Physics
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TECHNICAL NOTE
Year : 2017  |  Volume : 42  |  Issue : 3  |  Page : 140-143

Choice of a suitable dosimeter for photon percentage depth dose measurements in flattening filter-free beams


1 Beatson West of Scotland Cancer Centre, Glasgow, Scotland, UK
2 Edinburgh Cancer Centre, Edinburgh, Scotland, UK

Correspondence Address:
Francisco Cutanda Henríquez
Edinburgh Cancer Centre, Crewe Road South, EH4 2XU Edinburgh, Scotland
UK
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/jmp.JMP_11_17

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The International Atomic Energy Agency Technical Reports Series-398 code of practice for dosimetry recommends measuring photon percentage depth dose (PDD) curves with parallel-plate chambers. This code of practice was published before flattening filter-free (FFF) beams were widely used in clinical linear accelerators. The choice of detector for PDD measurements needs to be reassessed for FFF beams given the physical differences between FFF beams and flattened ones. The present study compares PDD curves for FFF beams of nominal energies 6 MV, 6 FFF, 10 MV, and 10 FFF from a Varian TrueBeam linear accelerator (Varian Medical Systems, Palo Alto, USA) acquired with Scanditronix photon diodes, two scanning type chambers (both PTW 31010 Semiflex), two small volume chambers (Wellhofer CC04 and PTW 31016 PinPoint 3D), PTW 34001 Roos, Scanditronix Roos, and NACP 02 parallel-plate chambers. Results show that parallel-plate ion chambers can be used for photon PDD measurements, although for better accuracy, recombination effects should be taken into account.


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