An artifact-free thyroid shield in CT examination: a phantom study

Sutanto, Heri; Irdawati, Yulia; Anam, Khoirul; Dougherty, Geoff; Hidayanto, Eko; Arifin, Zaenal; Soedarsono, Johny Wahyuadi; Bahrudin,

doi:10.1088/2057-1976/ab6ed1

Cited by 9 publications

(5 citation statements)

References 40 publications

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“…Our results showed that Saba shield and 100% Bi shield with thickness of 1T reduced the surface dose down to 50.2% and 51.7%, respectively. Radiation dose saving by our constructed shields is more than the reported values by Hohl et al [21], Inkoom et al [22], Lambert and Gould [23], Catuzzo et al [24], Sutanto et al [25] and Santos et al [26]. Hoang et al showed that O-TCM, and O-TCM with bismuth shield reduced thyroid dose down to 28% and 45%, respectively [20].…”

Section: Dose Reductionmentioning

confidence: 54%

Assessment of the effectiveness of Saba shielding with the composition of Cu–Bi in neck CT imaging: a phantom and patient study

Keshtkar,

Mosleh-Shirazi,

Saba

2023

J. Radiol. Prot.

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The use of computed tomography (CT) is a very well-established medical diagnostic imaging modality, however, the high radiation dose due to this imaging method is a major concern. Therefore, dose reduction methods are necessary, especially for superficial radiosensitive organs like the thyroid. The aim of this study is to construct and assess a CT shield with composition of 90% Cu and 10% Bi (Saba shield) with regard to dose reduction and image quality. The efficiency of the constructed shields for dose reduction was assessed by measuring entrance skin dose (ESD), using thermoluminescence dosimeters placed on an anthropomorphic phantom. Image quality was assessed quantitatively based on image noise and CT number accuracy by drawing regions of interest on CT images of the anthropomorphic phantom. Image quality was further investigated qualitatively in a patient study. Application of the Saba shield and 100% Bi shield with the thickness of one thickness (1T) reduced ESD by 50.2% and 51.7%, respectively, and using a three-fold thickness reduced ESD by 64.6% and 65.1%, respectively. Saba shield with thickness of 1T had no significant change in image noise in the anterior part, and image noise and mean CT number in the posterior part (P > 0.05). The statistical analysis performed did not find any meaningful difference between the study and control groups in image quality assessment of the patient study (P > 0.05). The 1T Saba shield reduced thyroid dose efficiently during neck CT imaging without causing unwanted effects on image quality.

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Section: Dose Reductionmentioning

confidence: 54%

Assessment of the effectiveness of Saba shielding with the composition of Cu–Bi in neck CT imaging: a phantom and patient study

Keshtkar,

Mosleh-Shirazi,

Saba

2023

J. Radiol. Prot.

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“…According to the International Commission on Radiological Protection (ICRP), the breast is one of the most vulnerable human organs to radiation and must be protected. The breast tissue weight factor is 0.12, meaning that the detriment from stochastic effects resulting from irradiation of that tissue compared to uniform whole-body irradiation is about 12% [4][5][6][7][8]. Therefore, the "as low as reasonably achievable (ALARA)" principle should be used to optimize the radiation dose [9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Hence there is a need for an alternative shielding material that is able to reduce the dose while maintaining image quality. Alternative materials of SR-Pb for dose reduction in specific organs, such as the thyroid, eyes, and gonads, have been reported [8,24,25]. It was found that SR-Pb reduces dose while maintaining image quality [8,25].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of silicone rubber-lead shield's effectiveness in protecting the breast during thoracic CT

Lestari¹,

Anam²,

Sutanto³

et al. 2023

Biomed. Phys. Eng. Express

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Radiation of thoracic computed tomography (CT) involves the breast as not an organ of interest. According to the International Commission on Radiological Protection (ICRP) No. 103, the breast is an organ with a high level of sensitivity when interacting with X-rays, increasing the potential risk of breast cancer. Therefore, the radiation dose must be optimized while maintaining image quality. The dose optimization can be accomplished using a radiation shield. This study aims to determine the effect of silicone rubber (SR)-lead (Pb) in various thicknesses as an alternative protective material for thoracic CT while maintaining image quality. SR-Pb was made by a simple method using SR and Pb. The SR-Pb had different thicknesses of 3, 6, 9, and 12 mm. The breast dose was measured using a CT dose profiler on the surface of the breast phantom. The CT number and the noise level of the resulting image were determined quantitatively. The dose without the radiation shield was 5.4 mGy. The doses measured using shielding with thicknesses of 3, 6, 9, and 12 mm were 5.2, 4.5, 4.3, and 3.3 mGy, respectively. Radiation shielding with a thickness of 12 mm reduced breast surface dose by up to 38%. The CT numbers and noise levels for the left and right breast phantom images were almost the same as those without radiation shields indicating there are only slight artifacts in the image. Therefore, the SR-Pb material is considered a good shielding and can be applied clinically by placing it directly on the breast surface for dose optimization.

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“…Nevertheless, the resulted image quality has not been discussed in the report [ 12 ]. Another alternative material for organ shield from SR-Pb has been reported [ 13 - 15 ]. Previously, the small percentage of Pb from 1-5 wt% in the SR-Pb has been used for reducing eye dose in the head CT examination [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Silicone Rubber-Lead (SR-Pb) Thickness on Dose Reduction and Image Quality as Gonad Shield

et al. 2020

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Background: Some organs in the body are sensitive to radiation such as eyes, breast, and gonads. Protection of sensitive organs against radiation is necessary. Recently, many sensitive organ shields have been developed from different materials. Objective: The aim of this study is to evaluate the dose reduction and image quality from implementation of Silicone Rubber-Lead (SR-Pb) as an alternative gonad shield in digital radiography (DR). Material and Methods: In this experimental study, the SR-Pb gonad shields with various thicknesses of 2, 4, 6, 8, and 10 mm were synthesized. This study used the Pb percentage of 5 wt%. An anthropomorphic phantom was used in abdomen plain examinations. The results obtained from the use of the SR-Pb was compared with standard gonad shield, i.e. lead apron. To measure the dose reduction, the Piranha detector was used. The image quality assessment was evaluated with the signal-to-noise ratio (SNR) and the contrast-to-noise ratio (CNR). Results: This study showed the dose reduction was significant for all SR-Pb thicknesses, and incrementally increased with the increase of the SR-Pb thickness. The minimum and maximum of dose reduction were 22.8% for 2 mm and 66.9% for 10 mm SR-Pb, respectively. Conclusion: Compared to the reference image without gonad shield, the SNR and CNR do not significantly change. Hence, the SR-Pb is probably to be used as an alternative gonad shield.

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An artifact-free thyroid shield in CT examination: a phantom study

Cited by 9 publications

References 40 publications

Assessment of the effectiveness of Saba shielding with the composition of Cu–Bi in neck CT imaging: a phantom and patient study

Assessment of the effectiveness of Saba shielding with the composition of Cu–Bi in neck CT imaging: a phantom and patient study

Evaluation of silicone rubber-lead shield's effectiveness in protecting the breast during thoracic CT

Effect of Silicone Rubber-Lead (SR-Pb) Thickness on Dose Reduction and Image Quality as Gonad Shield

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