Monte carlo simulation of a 6 MV varian LINAC photon beam using GEANT4-GATE code

Gonias, P.; Zaverdinos, P.; Loudos, George; Kappas, Constantin; Theodorou, K.

doi:10.1016/j.ejmp.2016.07.245

Cited by 2 publications

(2 citation statements)

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“…These methods have been used extensively in medical physics for studying radiation therapy [7,8]. They can be used to obtain information about the characterizations of the beam by analysing the dose distribution, the output factors and the beam energy [9].…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo-based analysis of the photon beam fluence with air gap thickness between Linac head exit window and patient’s skin in radiotherapy treatments

Bencheikh¹,

Maghnouj²,

Tajmouati³

2020

Nucl. Phys. At. Energy

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Linear accelerators (Linac) are used in radiation therapy treatment and its technology improvement ensures high dosimetry quality that should be conserved for high radiotherapy efficiency. However, does the air gap between the exit window of Linac head and patient’s skin alters the physical properties of the photon beam? The objective of this study is to assess the physical properties changes of photon beam fluence according to air gap thickness under the Linac head. The air gap under the Linac head is the last material in the photon beam path; it induces alterations in the beam quality before reaching the patient’s skin. The Varian Clinac 2100 head and the air gap up to the phantom surface are modelled using Monte Carlo BEAMnrc code; the nominal beam energy is 6 MV. The BEAMDP code is used to extract the photon fluence. The photon beam fluence is affected by the air gap under Linac head and decreases by six times due to the photon beam attenuation with air gap thickness; in addition to increasing of beam contamination by scattered photons and electrons. Thus, the air gap induces the beam quality deterioration which is evaluated in terms of photon fluence with air gap thickness. To remove the particles contaminations and conserve integrally the photon beam quality, the number of the photon interactions with air atoms should be as low as possible under Linac head up to patient’s skin and ensure a higher quality of the radiotherapy treatment of deep tumour.

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Section: Introductionmentioning

confidence: 99%

Monte Carlo-based analysis of the photon beam fluence with air gap thickness between Linac head exit window and patient’s skin in radiotherapy treatments

Bencheikh¹,

Maghnouj²,

Tajmouati³

2020

Nucl. Phys. At. Energy

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“…Since the knowing of the absorbed dose received by a particular patient is so more complicated task, that demand to invest anatomical information offered by CT scan and metabolic one retrieved from PET scan, we just focus on exploiting anatomical information offered by a medical internal radiation dose (MIRD) male phantom mimicking a human male adult of about 70 Kg. In this research paper, we use Monte Carlo Geant4 code which is a powerful tool for medical physics applications as it is well showed by many valuable works in radiotherapy,[ 6 7 8 ] brachytherapy,[ 9 ] and nuclear medicine. [ 10 ]…”

Section: Introductionmentioning

confidence: 99%

Ratios of internal doses deposited in different organs to the whole body when such organ is adopted as source of 18F-fluorodeoxyglucose, a Monte Carlo Geant4 study on a male medical internal radiation dose phantom

et al. 2020

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In the present study, the last stable version of Monte Carlo Geant4 code known as Geant4.10.3 has been used for measuring internal dose ratios to the whole body for about 40 organs. This, by performing a Monte Carlo model of 18 F-fluorodeoxyglucose ( 18 F-FDG) inside different organs of medical internal radiation dose male phantom, mimics a human male adult of 70 kg. A dedicated Geant4 user code has been developed in the top of one offered by Geant4 Monte Carlo toolkit and so-called human phantom. Several Monte Carlo simulations have been carried out, and in each of them, we have taken up such organ as source of 18 F-FDG with a small amount of radioactivity, evenly distributed across its volume, and we measure ratios of absorbed doses deposited in organs to the whole body. The results have shown that there are radiation dose contributions from surrounding organs and their gravities are so variable; some organs have near-local character; thus, almost all radiations are locally deposited, which generally do not affect surrounding ones mainly including adrenals, thyroid, clavicles, thymus, testes, bladder, pancreas, scapula and upper spine; whereas, it is not the case for many other organs in which radiation doses are deposited outside of their parent volumes. In addition, absorbed doses in some organs that have high-tissue weighting factors, namely colon, lungs, stomach, bladder, thyroid, and liver are seriously affected by radioactivity of surrounding muscle organs, the gravity of such affectation is mainly growth when a patient is identified as having hyperglycemia or undergoing a hard physical activity.

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Monte carlo simulation of a 6 MV varian LINAC photon beam using GEANT4-GATE code

Cited by 2 publications

References 0 publications

Monte Carlo-based analysis of the photon beam fluence with air gap thickness between Linac head exit window and patient’s skin in radiotherapy treatments

Monte Carlo-based analysis of the photon beam fluence with air gap thickness between Linac head exit window and patient’s skin in radiotherapy treatments

Ratios of internal doses deposited in different organs to the whole body when such organ is adopted as source of 18F-fluorodeoxyglucose, a Monte Carlo Geant4 study on a male medical internal radiation dose phantom

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