Effective Atomic Number and Electron Density Determination for Fricke Gel Dosimeters Using Different Methods

Moussous, Ouiza

doi:10.4103/jmp.jmp_83_21

Cited by 5 publications

(1 citation statement)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moussous et al [27] estimated the effective atomic number relative to water of two types of Fricke gel dosimeters (FX-PVA-GTA and Ferrous Xylenol Gelatin gels) at about 2.25% for photon interaction in the energy range from 10 keV to 1000 MeV. Alyani Nezhad et al [28] focused on gel dosimetry applications in low-energy radiation contexts applied through radiotherapy or interventional radiology.…”

Section: Introductionmentioning

confidence: 99%

Investigating the performance of susceptibility-weighted images in Fricke gel dosimeter reading and optimizing the related imaging parameters

Elmtalab,

Ghazi Mir Saeid,

Rad

et al. 2023

Biomed. Phys. Eng. Express

View full text Add to dashboard Cite

Fricke gel dosimeters are especially useful in small-field dosimetry and validation of treatment delivery inthree-dimensional space with features such as tissue equivalence, non-toxicity, high spatial resolution, nondependenceon energy, and dose rate. The use of basic MRI imaging protocols (T1W and T2W) for readingFricke gel dosimeters has always been considered the dominant method in many studies. However, thedevelopment and application of advanced MRI techniques for more accurate readings of Fricke geldosimeters can be useful. Considering that in the main structure of Fricke gel, there are conversions of ironions to each other, this study aimed to investigate the performance of susceptibility-based images (SWI andQSM) based on magnetic susceptibility in the reading of Fricke gel dosimeters and to optimize the relatedimaging parameters. For this purpose, a Fricke-Xylenol orange-gelatin was made at five concentrations ofiron ammonium sulfate. To obtain gel dosimeter calibration curves, vials containing gel were subjected toirradiation at three different doses by a linear accelerator. The reading of gel dosimeters was performedusing MRI imaging in three protocols, T1W, T2W, and SWI, and analyzed with a method unique to eachone. Finally, the results obtained from the three protocols were compared with each other. The comparisonof calibration curves in three imaging protocols shows that the sensitivity of calibration curves in SWI wasabout three times its value in T2W, and on the other hand, the reported sensitivity in T1W was very smallcompared to the other two protocols. The linearity factor was similar between SWI and T1W protocols andhigher in T2W. Therefore, it is concluded that in addition to the relaxometry techniques that have been usedas a conventional method for reading Fricke gel dosimeter, SWI imaging has high sensitivity and specificityfor reading dosimeter gel based on iron.

show abstract

Section: Introductionmentioning

confidence: 99%