Dosimetric Aspects of Small Circular Fields of 10 MV Photon Beam

Al-Najjar, W.H; Prasad, S. Guru; Parthasaradhi, K.; Bloomer, William D.; Nanda, Rupalin

doi:10.1016/s0958-3947(97)00115-5

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Challenges In Small-field Dosimetry1

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2018

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“…[ 11 ] Since an accurate beam profile is one of the required parameters for TPSs, these inaccuracies in measurements become a concern in commissioning and quality assurance. [ 11 12 13 ] Therefore, using small size detectors with a high resolution is desirable to avoid volume averaging in small photon fields.…”

Section: Challenges In Small-field Dosimetrymentioning

confidence: 99%

Different dosimeters/detectors used in small-field dosimetry: Pros and cons

et al. 2018

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With the advent of complex and precise radiation therapy techniques, the use of relatively small fields is needed. Using such field sizes can cause uncertainty in dosimetry; therefore, special attention is required both in dose calculations and measurements. There are several challenges in small-field dosimetry such as the steep gradient of the radiation field, volume averaging effect, lack of charged particle equilibrium, partial occlusion of radiation source, beam alignment, and unable to use a reference dosimeter. Due to these challenges, special dosimeters are needed for small-field dosimetry, and this review article discusses this topic.

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