Optical and X-ray computed tomography scanning of 3D dosimeters

Jordan, Kevin; Hilts, Michelle; Jirásek, A

doi:10.1088/1742-6596/847/1/012019

Cited by 5 publications

(3 citation statements)

References 55 publications

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“…A different array gives a different type of response over the same sub-surface feature. Some arrays provide better responses over vertical changes, and some deliver better responses for horizontal changes [40]. Different arrays have different sensitivity, depth of investigation and different signal strength [41].…”

Section: A Sensitivity Mapsmentioning

confidence: 99%

Enhancing indoor radio tomographic imaging based on minimum RF nodes

Abdullah,

Rahiman,

Khalid

et al. 2024

IJEEI

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Uses the attenuation on the links between transceivers to produce an image using Radio Tomographic Imaging (RTI), a network of transceivers, or a Wireless Sensor Network (WSN). Several RTI setups have been constructed as monitoring areas. However, it is observed that most setups have limitations in the number of RF nodes due to a limited number of measurements. However, it is well known that the main difficulty in radio tomographic imaging attributes to the uncertainties in the RSS measurements of transceivers due to multipath effects, especially, when the environment of interest is much cluttered, and requirements on the larger number of nodes for the performance improvement. It is highly remarkable that the motivation of using fewer nodes in this work is to reduce the deployment cost of radio tomographic imaging, slower data collection rates, longer imaging reconstruction times, and bigger sensitivity matricest, this lead author to proposed to design and development of an RTI system with a minimum of 8 RF nodes. The strong and weak received signal strength (RSS) exhibited in the images will be used to assess the effectiveness and accuracy of human sensing localization in a region. The images were reconstructed based on selected image reconstruction algorithms, and they are Linear Back-Projection (LBP), Filtered Back Projection (FBP), Gaussian, Newton's Onestep's Error Reconstruction (NOSER) and Tikhonov Regularization (TR). The reconstructed images will be analysed using the Mean Structural Similarity (MSSIM) index. A comparison between the algorithms mentioned RTI system based on the MSSIM index. NOSER and TR algorithms scored the highest for the MSSIM index overall experiments, and it is the best technique to produce images that appear similar to the original images.

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Section: A Sensitivity Mapsmentioning

confidence: 99%

Enhancing indoor radio tomographic imaging based on minimum RF nodes

Abdullah,

Rahiman,

Khalid

et al. 2024

IJEEI

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“…The matrices indicate the area where relative permittivity changes would influence the electric field measurement. [12]. Different arrays have different sensitivity, depth of investigation and different signal strength [13].…”

Section: Sensitivity Mapsmentioning

confidence: 99%

Initial Study of Radio Tomographic Imaging for Human localization by using Simulation Model

Abdullah,

Rahiman,

Khalid

et al. 2023

J. Phys.: Conf. Ser.

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This paper explains the details of modelling the simulation works designin setup for the RTI system. Th simulation modelling using software is focused on the interaction of electromagnetic behaviour in a dielectric medium of human inside a monitoring area. The modelling works have involved the criteria of the human, frequency and number of sensor nodes, dielectric properties of the human and last but not least, the configurations of the Radio tomography imaging (RTI) system. The model is then developed in the software to observe and investigate the result.

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“…Optical computed tomography has been shown to be very promising in the measurement of both 3D polymer gel and radiochromic gel dosimeters [ 21 , 22 , 23 , 24 ]. These early studies by Oldham et al [ 21 , 22 ] on 3D polymer gel dosimetry resulted in sensitizing other researchers to optical artifacts and geometric distortions using optical computed tomography as a reading method.…”

Section: Introductionmentioning

confidence: 99%

Laser Light Trapping Phenomenon in a 3D Radiotherapy Polymer Gel Dosimeter

et al. 2021

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This paper aims to explain the phenomenon of laser light trapping (LLT) in a 3D polymer gel dosimeter. A VIC-T polymer gel dosimeter containing 17% N-vinylpyrrolidone, 8% N,N′-methylenebisacrylamide, 12% tert-butyl alcohol, 5% gelatine, 0.02% hydroquinone and 14 mM tetrakis(hydroxymethyl)phosphonium chloride was used in this study. It was exposed to green laser light with a wavelength of 532 nm. A film was recorded during the exposure. After exposure, Raman spectroscopy was used to study the reactions taking place inside the dosimeter. The obtained results were used to explain what the LLT phenomenon is, what are the consequences for the dosimeter in which such a phenomenon occurs, and what dosimeter components play an important role in the occurrence of LLT. In addition, the conditions under which 3D polymer gel dosimeters can be measured using optical computed tomography at short wavelengths of visible laser light are indicated.

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Optical and X-ray computed tomography scanning of 3D dosimeters

Cited by 5 publications

References 55 publications

Enhancing indoor radio tomographic imaging based on minimum RF nodes

Enhancing indoor radio tomographic imaging based on minimum RF nodes

Initial Study of Radio Tomographic Imaging for Human localization by using Simulation Model

Laser Light Trapping Phenomenon in a 3D Radiotherapy Polymer Gel Dosimeter

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