Pregled bibliografske jedinice broj: 651778
Određivanje absorbirane doze u vodi za Leksell Gamma Knife uređaj
Određivanje absorbirane doze u vodi za Leksell Gamma Knife uređaj // Zbornik radova 9.Simpozija Hrvatskog društva za zaštitu od zracenja / Knežević, Željka ; Majer, Marija ; Krajcar Bronić, Ines (ur.).
Zagreb: Hrvatsko društvo za zaštitu od zračenja, 2013. str. 87-92 (predavanje, nije recenziran, cjeloviti rad (in extenso), znanstveni)
CROSBI ID: 651778 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
Određivanje absorbirane doze u vodi za Leksell Gamma Knife uređaj
(Determination of absorbed dose to water for Leksell Gamma Knife Unit)
Autori
Hršak, Hrvoje
Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni
Izvornik
Zbornik radova 9.Simpozija Hrvatskog društva za zaštitu od zracenja
/ Knežević, Željka ; Majer, Marija ; Krajcar Bronić, Ines - Zagreb : Hrvatsko društvo za zaštitu od zračenja, 2013, 87-92
ISBN
978-953-96133-8-7
Skup
9. simpozij Hrvatskog društva za zaštitu od zračenja
Mjesto i datum
Krk, Hrvatska, 10.04.2013. - 12.04.2013
Vrsta sudjelovanja
Predavanje
Vrsta recenzije
Nije recenziran
Ključne riječi
Gamma Knife; absorbirana doza; plastični fantom; ABS; PMMA
(Gamma Knife; absorbed dose; plastic phantom; ABS; PMMA)
Sažetak
Because of geometry of photon beams in Leksell Gamma Knife Unit (LGK), there is a several technical problems in applying standard protocols for determination of absorbed dose to water (Dw). Currently, Dw in LGK unit, measured at the center of spherical plastic phantom, is used for dose calculation in LGK radiosurgery. Treatment planning software (LGP TPS) accepts this value as a measurement in water and since plastic phantom has bigger electron density than water, this leads to systematic errors in dose calculation. To reduce this errors, a photon attenuation correction (PAC) method was applied. For that purpose, measurements of absorbed dose in two different plastic phantoms were maid with ionization chamber (PTW Freiburg). For measured dose values, PAC to water was applied, based on electron density (ED) and equivalent water depths of the plastic phantoms. The relationship between CT number and ED was determined by measuring CT number of standard CT to ED phantom (CIRS Phantom). Absorbed dose in plastic phantoms was in average 2.5% lower than calculated dose in water, meaning that dose determination errors related to the difference of phantom materials should not be neglected and measured dose should be corrected before usage for patient treatment dose calculation.
Izvorni jezik
Hrvatski
Znanstvena područja
Fizika, Kliničke medicinske znanosti
