Basic features of VIC-T dosimeter with spiral CT readout, CT scanning conditions and data processing with a new polyGeVero-CT software package

Maras, Piotr; Jaszczak, Malwina; Kozicki, Marek

doi:10.1016/j.radphyschem.2021.109730

Cited by 12 publications

(17 citation statements)

References 47 publications

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“…The reason for this profile shape is the CBCT scanning conditions of the container. The container was scanned on an accelerator bench in air, not in a water phantom (consult Figure 4 elsewhere [ 40 ]; the shape of the profiles is related to the CBCT X-ray beam hardening effect, as discussed elsewhere [ 49 , 50 ]). In summary, of the four markers used, two are not applicable to isocenter studies: steel wire commonly used as a marker in CT and reflective marker spheres (Brainlab).…”

Section: Resultsmentioning

confidence: 99%

“…It was shown elsewhere for spiral CT measurements of 3D polymer gel dosimeters [ 40 ] that CT image processing significantly affects image quality. Proper image processing can reduce image noise and bring out the details of the image accordingly.…”

Section: Resultsmentioning

confidence: 99%

“…The isocenter data processing, after scanning the irradiated PABIG nx 3D polymer gel dosimeter, was performed with the polyGeVero-CT software package (v.1.2, GeVero Co., Poland). A description of the software package v. 1.0.1 can be found elsewhere [ 40 ]. The current version of the software package (v.1.2) was enriched with several algorithms, including isocenter data processing related to the 3D polymer gel dosimetry measurements with CT.…”

Section: Methodsmentioning

confidence: 99%

“…In this work, 3D polymer gel dosimetry was used as a tool for determining the irradiation isocenter. The tool consists of a 3D polymer gel dosimeter in a dedicated ~1 L container; kilovoltage imaging systems, which are the CBCT and iCBCT of Halcyon and TrueBeam accelerators; and fast data processing using the polyGeVero-CT software package (v. 1.2) [ 40 ]. As a 3D polymer gel dosimeter, PABIG nx [ 41 , 42 , 43 ] was selected.…”

Section: Introductionmentioning

confidence: 99%

“…This should save time and facilitate calculations. A description of the software and its use in similar studies can be found elsewhere [ 40 ]. Version v.1.2 of the software has been enriched with functionalities related to isocenter calculation.…”

Section: Introductionmentioning

confidence: 99%

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Fast Isocenter Determination Using 3D Polymer Gel Dosimetry with Kilovoltage Cone-Beam CT Reading and the PolyGeVero-CT Software Package for Linac Quality Assurance in Radiotherapy

Maras

Kozicki

2022

Materials

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This work presents an approach to the fast determination of a medical accelerator irradiation isocenter as a quality assurance (QA) procedure in radiotherapy. The isocenter determination tool is the tissue equivalent high-resolution 3D polymer gel dosimeter (PABIGnx) in a dedicated container combined with kilovoltage imaging systems and the polyGeVero-CT software package (v. 1.2, GeVero Co., Poland). Two accelerators were employed: Halcyon and TrueBeam (Varian, USA), both equipped with cone beam computed tomography (CBCT) and iterative reconstruction CBCT (iCBCT) algorithms. The scope of this work includes: (i) the examination of factors influencing image quality (reconstruction algorithms and modes), radiation field parameters (dose and multi-leaf collimator (MLC) gaps), fiducial markers, signal averaging for reconstruction algorithms and the scanning time interval between consecutive scans, (ii) the examination of factors influencing the isocenter determination, image processing (signal averaging, background subtraction, image filtering) and (iii) an isocenter determination report using a 2D and 3D approach. An optimized protocol and isocenter determination conditions were found. The time and effort required to determine the isocenter are discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fast Isocenter Determination Using 3D Polymer Gel Dosimetry with Kilovoltage Cone-Beam CT Reading and the PolyGeVero-CT Software Package for Linac Quality Assurance in Radiotherapy

Maras

Kozicki

2022

Materials

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First Combined, Double‐Density LCV‐Pluronic F‐127 Radiochromic Dosimeter Mimicking Lungs and Muscles

Kozicki

Bartosiak

Maras

et al. 2023

Adv Materials Technologies

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3D chemical dosimetry of radiotherapy is an interdisciplinary research related to medical physics, polymer and radiation chemistry, photochemistry, organic chemistry, computer science, oncology, materials engineering, and automation technology. It consists of a 3D high resolution tissue equivalent dosimeter, high resolution 3D reading, and software packages for fast processing of 3D measurement data. Research on 3D radiotherapy chemical dosimetry has been going on for almost forty years, starting with the first proposal of a 3D dosimeter -Fricke dosimetric solution in a physical gel matrix with magnetic resonance imaging (MRI) reading to record the spatial dose distribution. [1] Further research concerned both Fricke-gel dosimeters and other systems, such as polymer gel dosimeters, radiochromic gel and plastic dosimeters, and flexible dosimeters. Many dosimetric compositions have been proposed. As a general rule, each new 3D dosimeter has a specific acronym, usually derived from its components. Examples of 3D polymer gel dosimeters are as follows (the acronyms are associated with example references): BANG, [16] PAG, [17] PAGAT, [18] nMAG, nPAG, [19] MAGIC, [17,20] MAGIC-f, [21] NIPAM, [22,23] VIPAR, [24] VIP (VIPAR nd ), [25] VIC, [26] VIC-T, [26] VIP3-Pluronic F-127, [27,28] PAGAT2-Pluronic F-127, [29] PAB-IG nx , [14,30,31] NHMAGAT, [32] MAGADIT, [33] NMPAGAT. [34] Examples of 3D radiochromic dosimeters are as follows: PVA-GTA-XO-Fricke, [35,36] PVA-GTA-MTB-Fricke, [37] Fricke-XOgelatine, [38] Fricke-XO-Pluronic F-127, [10,13,39] TTC-Pluronic F-127, [40] NBT-Pluronic F-127, [41,42] KI-PVA, [43] KI-Pluronic F-127, [12] LCV-gelatine; [44] and 3D plastic radiochromic dosimeter: PRESAGE. [3,45,46] 3D flexible dosimeters have also been proposed: LMG-silicone, [47,48] FlexyDos3D, [49] as well as 3D lung-mimicking dosimeters: PAGAT-2-Pluronic F-127 foam, [11] foam based on methacrylic acid-gelatine infused with sodium dodecyl sulphate surfactant, [50] and methacrylic acid-gelatine gel with expanded polystyrene spheres. [51] It should be mentioned that alternative 3D reading techniques to MRI were also investigated, including computed tomography (CT), [22,23,52] ultrasonography, [53][54][55] and optical computed tomography (optical CT). [56,57] It has been shown that 3D dosimetry data This work reports on a new type of combined radiochromic ionizing radiation dosimeter for radiotherapy. The LCV-Pluronic F-127 serves for this purpose, which is a leuco crystal violet embedded in a physical hydrogel matrix of poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) (Pluronic F-127) with additives. This dosimeter responds to ionizing radiation by developing a blue color with an intensity related to the radiation dose. The LCV-Pluronic F-127 dosimeter is improved for lower temperature stability by adding sodium chloride (NaCl). Subsequently, a method for manufacturing the LCV-Pluronic F-127 lung mimicking dosimeter is proposed. Next, the LCV-Pluronic F-127 3D composite dosimeter is elaborated, which cont...

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Features of 2Day.QA® as a 2D radiation dosimeter

Kozicki¹,

Maras²

2022

Physica Medica

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Basic features of VIC-T dosimeter with spiral CT readout, CT scanning conditions and data processing with a new polyGeVero-CT software package

Cited by 12 publications

References 47 publications

Fast Isocenter Determination Using 3D Polymer Gel Dosimetry with Kilovoltage Cone-Beam CT Reading and the PolyGeVero-CT Software Package for Linac Quality Assurance in Radiotherapy

Fast Isocenter Determination Using 3D Polymer Gel Dosimetry with Kilovoltage Cone-Beam CT Reading and the PolyGeVero-CT Software Package for Linac Quality Assurance in Radiotherapy

First Combined, Double‐Density LCV‐Pluronic F‐127 Radiochromic Dosimeter Mimicking Lungs and Muscles

Features of 2Day.QA® as a 2D radiation dosimeter

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