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Pregled bibliografske jedinice broj: 722687

Correction of measured Gamma-Knife output factors for angular dependence of diode detectors and PinPoint ionization chamber


Hršak, Hrvoje; Majer, Marija; Grego, Timor; Bibić, Juraj; Heinrich, Zdravko
Correction of measured Gamma-Knife output factors for angular dependence of diode detectors and PinPoint ionization chamber // Physica medica, 30 (2014), 8; 914-919 doi:10.1016/j.ejmp.2014.09.002 (međunarodna recenzija, članak, znanstveni)


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Naslov
Correction of measured Gamma-Knife output factors for angular dependence of diode detectors and PinPoint ionization chamber

Autori
Hršak, Hrvoje ; Majer, Marija ; Grego, Timor ; Bibić, Juraj ; Heinrich, Zdravko

Izvornik
Physica medica (1120-1797) 30 (2014), 8; 914-919

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Gamma-Knife output factor; Silicon diode; PinPoint ionization chamber; Correction for angular dependence

Sažetak
Dosimetry for Gamma-Knife requires detectors with high spatial resolution and minimal angular dependence of response. Angular dependence and end effect time for p-type silicon detectors (PTW Diode P and Diode E) and PTW PinPoint ionization chamber were measured with Gamma- Knife beams. Weighted angular dependence correction factors were calculated for each detector. The Gamma- Knife output factors were corrected for angular dependence and end effect time. For Gamma-Knife beams angle range of 84°-54°. Diode P shows considerable angular dependence of 9% and 8% for the 18 mm and 14, 8, 4 mm collimator, respectively. For Diode E this dependence is about 4% for all collimators. PinPoint ionization chamber shows angular dependence of less than 3% for 18, 14 and 8 mm helmet and 10% for 4 mm collimator due to volumetric averaging effect in a small photon beam. Corrected output factors for 14 mm helmet are in very good agreement (within ±0.3%) with published data and values recommended by vendor (Elekta AB, Stockholm, Sweden). For the 8 mm collimator diodes are still in good agreement with recommended values (within ±0.6%), while PinPoint gives 3% less value. For the 4 mm helmet Diodes P and E show over-response of 2.8% and 1.8%, respectively. For PinPoint chamber output factor of 4 mm collimator is 25% lower than Elekta value which is generally not consequence of angular dependence, but of volumetric averaging effect and lack of lateral electronic equilibrium. Diodes P and E represent good choice for Gamma-Knife dosimetry.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kliničke medicinske znanosti



POVEZANOST RADA


Ustanove
Institut "Ruđer Bošković", Zagreb,
Klinički bolnički centar Zagreb

Profili:

Avatar Url Hrvoje Hršak (autor)

Avatar Url Zdravko Heinrich (autor)

Avatar Url Marija Majer (autor)

Citiraj ovu publikaciju

Hršak, Hrvoje; Majer, Marija; Grego, Timor; Bibić, Juraj; Heinrich, Zdravko
Correction of measured Gamma-Knife output factors for angular dependence of diode detectors and PinPoint ionization chamber // Physica medica, 30 (2014), 8; 914-919 doi:10.1016/j.ejmp.2014.09.002 (međunarodna recenzija, članak, znanstveni)
Hršak, H., Majer, M., Grego, T., Bibić, J. & Heinrich, Z. (2014) Correction of measured Gamma-Knife output factors for angular dependence of diode detectors and PinPoint ionization chamber. Physica medica, 30 (8), 914-919 doi:10.1016/j.ejmp.2014.09.002.
@article{article, year = {2014}, pages = {914-919}, DOI = {10.1016/j.ejmp.2014.09.002}, keywords = {Gamma-Knife output factor, Silicon diode, PinPoint ionization chamber, Correction for angular dependence}, journal = {Physica medica}, doi = {10.1016/j.ejmp.2014.09.002}, volume = {30}, number = {8}, issn = {1120-1797}, title = {Correction of measured Gamma-Knife output factors for angular dependence of diode detectors and PinPoint ionization chamber}, keyword = {Gamma-Knife output factor, Silicon diode, PinPoint ionization chamber, Correction for angular dependence} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus
  • MEDLINE


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