Background fog subtraction methods in Gafchromic® dosimetry

Gueli, Anna Maria; Cavalli, N.; Vincolis, R. De; Raffaele, L.; Troja, S. O.

doi:10.1016/j.radmeas.2014.11.005

Cited by 25 publications

(10 citation statements)

References 29 publications

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“…An international protocol was adopted for film process and optical signal analysis of the low-energy radiation distribution [ 19 ]. GAF chromic EBT2 film (ISP Technology Inc., Wayne, NJ, USA; Lot # F05090901, expiry date April 2019) was used.…”

Section: Output Calibrationmentioning

confidence: 99%

Using magnetic material to repulse electrons in Axxent eBT for skin preservation during early-stage breast cancer conservative intra-operative radiotherapy

Wang

2021

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A miniature electronic X-ray source was employed in this study to deliver intra-operative radiotherapy (IORT) within breast lesions. A flexible magnetic material was used to reduce breast skin radiation damage. Total prescribed dose was 20 Gy at balloon surface, with breast tumor bed wrapped around balloon applicator. A flexible magnetic material, called 'neodymium-iron boron' (NdFeB) + alloy-49 was applied to cover lesion's surface to preserve the skin and to reduce electron contamination raised from photon-induced low-energy electrons, with tissue less than 1 cm between applicator surface and breast skin. The reduction of electron contamination using NdFeB + alloy-49 with an applicator-skin distance of 20 mm, ranged from 7% to 10%, while with an applicator-skin distance of 10 mm for balloon volumes from 30 to 50 cm 3 , it ranged from 4% to 6% only. NdFeB + alloy-49 magnetic material was efficient in repulsing photon-induced low-energy electrons for skin preservation to compensate for deficiency of tissue over less than 1 cm gap between the surface of applicator and the breast skin.

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Section: Output Calibrationmentioning

confidence: 99%

Using magnetic material to repulse electrons in Axxent eBT for skin preservation during early-stage breast cancer conservative intra-operative radiotherapy

Wang

2021

jcb

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“…This was set up using the reflective mode because of the film opaque property [2,10,14], an RGB image with a resolution of 72 dpi in 48-bit and no color corrections was applied [11,15]. The image analysis was performed in the red channel and the pixel-by-pixel background fog subtraction method was applied [11,16] using ImageJ software (available at https://imagej.net).…”

Section: Calibration Dosimeter Proceduresmentioning

confidence: 99%

CT-Dose Measurement of the Spinal Cord Region Using XR-QA2 Radiochromic Films and TLD 100H Dosimeters

et al. 2020

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The European Directive 2013/59/Euratom focuses on the radiation protection and patient dosimetry. In particular, the dose absorbed by serial organs such as the spinal cord due to diagnostic exams plays a crucial role in the appraisal of medical exposure. In this work, a comparison between dose measurements performed with GafchromicTM XR-QA2 and TLD 100H is presented. The dosimeters—after a calibration procedure through an X-ray tube—were placed within the thorax region of an anthropomorphic phantom corresponding to the spinal cord area exposed to a thoracic CT procedure. The mean-dose value was measured with GafchromicTM first, and it was then compared to the dose value obtained with TLDs, resulting in a good agreement between the two dosimetric methodologies. Additionally, the results showed that—due to the usage of the automatic exposure control (EC) system—the discrepancy between the two methods is proportional to the current output of the CT system.

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“…Over the years, the physicists have developed several systems to measure the radiation dose or, more in general, to characterize the quality of an ionizing radiation field [1]. These include ionization chambers, radiographic and radiochromic film, semiconductor detectors, thermoluminescence and optically stimulated luminescence, scintillation dosimeters and electron spin resonance dosimeters [1][2][3][4][5][6][7]. However, current dosimeters are only able to measure the dose in a limited volume (1D dosimeters) or in a plane (2D dosimeters) and thus they cannot provide a dose distribution over larger three dimensional (3D) volumes [8].…”

Section: Introductionmentioning

confidence: 99%

Effect of ionizing radiation on the colorimetric properties of PVA-GTA Xylenol Orange Fricke gel dosimeters

et al. 2021

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Background fog subtraction methods in Gafchromic® dosimetry

Cited by 25 publications

References 29 publications

Using magnetic material to repulse electrons in Axxent eBT for skin preservation during early-stage breast cancer conservative intra-operative radiotherapy

Using magnetic material to repulse electrons in Axxent eBT for skin preservation during early-stage breast cancer conservative intra-operative radiotherapy

CT-Dose Measurement of the Spinal Cord Region Using XR-QA2 Radiochromic Films and TLD 100H Dosimeters

Effect of ionizing radiation on the colorimetric properties of PVA-GTA Xylenol Orange Fricke gel dosimeters

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