Small field measurements with a novel silicon position sensitive diode array

S. Manolopoulos, C. Wojnecki, R. Hugtenburg, Mohamed Ariff Jaafar Sidek, G. Chalmers, G. Heyes, S. Green

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

DOSI, a novel dosimeter based on position sensitive detectors for particle physics experiments, was used for relative clinical dosimetry measurements in small radiotherapy fields. The device is capable of dynamic measurements in real time and provides sub-millimetre spatial resolution. The basic beam data for a stereotactic radiotherapy collimator system (BrainLAB) using 6 MV photons were measured and compared with the corresponding data acquired with a small diamond detector and a PinPoint ionization chamber. All measurements showed an excellent agreement between DOSI and the diamond detector. There was an increasing discrepancy between the relative output factors (ROF) measured with DOSI and those measured with the ionization chamber with decreasing field size, specifically for collimators with a diameter smaller than 15 mm. The percentage depth doses (PDD) were in agreement to better than 1% for all depths. The agreement on off-axis ratios (OAR) was better than 3% for all collimators, whereas the agreement on relative output factors (ROF) was at the 1% level. DOSI's fast read-out electronics made it possible for all measurements to be recorded within 45 min including time to change collimators. This should reduce the overall time for commissioning and QA measurements, an important factor especially for busy radiotherapy departments.

Original languageEnglish
Pages (from-to)485-495
Number of pages11
JournalPhysics in Medicine and Biology
Volume54
Issue number3
DOIs
Publication statusPublished - 2009
Externally publishedYes

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Silicon
Diamond
Radiotherapy
Physics
Photons
Equipment and Supplies

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

Cite this

Small field measurements with a novel silicon position sensitive diode array. / Manolopoulos, S.; Wojnecki, C.; Hugtenburg, R.; Jaafar Sidek, Mohamed Ariff; Chalmers, G.; Heyes, G.; Green, S.

In: Physics in Medicine and Biology, Vol. 54, No. 3, 2009, p. 485-495.

Research output: Contribution to journalArticle

Manolopoulos, S, Wojnecki, C, Hugtenburg, R, Jaafar Sidek, MA, Chalmers, G, Heyes, G & Green, S 2009, 'Small field measurements with a novel silicon position sensitive diode array', Physics in Medicine and Biology, vol. 54, no. 3, pp. 485-495. https://doi.org/10.1088/0031-9155/54/3/002
Manolopoulos, S. ; Wojnecki, C. ; Hugtenburg, R. ; Jaafar Sidek, Mohamed Ariff ; Chalmers, G. ; Heyes, G. ; Green, S. / Small field measurements with a novel silicon position sensitive diode array. In: Physics in Medicine and Biology. 2009 ; Vol. 54, No. 3. pp. 485-495.
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