Thyroid dose reduction shield with the generation of less artifacts used for fast chest CT examination

Takegami, Kazuki; Hayashi, Hiroaki; Maeda, Tatsuya; Lee, Cheonghae; Nishigami, Rina; Asahara, Takashi; Goto, Sota; Kobayashi, Daiki; Ando, Masahiro; Kanazawa, Yuki; Yamashita, Kazuo; Higashino, Kosaku; Murakami, Shuichi; Konishi, Takeshi; Maki, Motochika

doi:10.1016/j.radphyschem.2022.110635

Cited by 6 publications

(8 citation statements)

References 37 publications

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“…Then, the spectra were converted to airkerma using the energy absorption coefficient of air. 30 DRF values were obtained from the air-kerma values related to the incident and penetrating x-ray spectra; the simulated DRF value can be calculated by replacing Dose and Dose 0 values in Equation (2).…”

Section: X-ray Shielding Ability Evaluationmentioning

confidence: 99%

“…For example, we previously proposed a collar-type thyroid protector. 30 Due to its elasticity, this protector does not impose stress on the neck and would be valuable in reducing thyroid exposure doses during a chest CT examination. Our shield is designed to be positioned outside the field of view (FOV) during use.…”

Section: Applications and Limitationsmentioning

confidence: 99%

“…The DRF values of the lead and elastic x-ray shield decrease as the tube voltage increases, because the mass attenuation coefficient of a material decreases as energy increases. 30 We compared the experimental and simulation results conducted in this study at a tube voltage of 100 kV (Figure A1(c)) with the measurement results of a shield F I G U R E A 1 Relationship between (𝜌t) metal and DRF when using a tube voltage of 60-120 kV. Graphs of (a), (b), (c), and (d) show the results when the tube voltage was set to 60, 80, 100, and 120 kV, respectively.…”

Section: Data Ava I L a B I L I T Y S Tat E M E N Tmentioning

confidence: 99%

“…The inclusion of elasticity in the thyroid protector resolved concerns regarding discomfort during use and minimized the occurrence of metal artifacts associated with the shield. Our previous paper only evaluated the clinical effectiveness experimentally; it did not describe the manufacturing procedure and principle underlying our novel shield and did not comprehensively discuss the shielding ability and the novel property of elasticity 30 . If an x‐ray shield having new functions can be developed, it would open up the potential for broader applications of x‐ray shields not only in CT imaging, but also in the fields of general x‐ray imaging, dental radiology, mammography, and so on.…”

Section: Introductionmentioning

confidence: 99%

“…cal effectiveness experimentally; it did not describe the manufacturing procedure and principle underlying our novel shield and did not comprehensively discuss the shielding ability and the novel property of elasticity. 30 If an x-ray shield having new functions can be developed, it would open up the potential for broader applications of x-ray shields not only in CT imaging, but also in the fields of general x-ray imaging, dental radiology, mammography, and so on.…”

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confidence: 99%

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Performance of elastic x‐ray shield made by embedding Bi₂O₃ particles in porous polyurethane

Maeda,

Hayashi,

Ando

et al. 2023

Medical Physics

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BackgroundMany healthcare institutions have guidelines concerning the usage of protective procedures, and various x‐ray shields have been used to reduce unwanted radiation exposure to medical staff and patients when using x‐rays. Most x‐ray shields are in the form of sheets and lack elasticity, which limits their effectiveness in shielding areas with movement, such as the thyroid. To overcome this limitation, we have developed an innovative elastic x‐ray shield.PurposeThe purpose of this study is to explain the methodology for developing and evaluating a novel elastic x‐ray shield with sufficient x‐ray shielding ability. Furthermore, valuable knowledge and evaluation indices are derived to assess our shield's performance.MethodsOur x‐ray shield was developed through a process of embedding Bi2O3 particles into porous polyurethane. Porous polyurethane with a thickness of 10 mm was dipped into a solution of water, metal particles, and chemical agents. Then, it was air‐dried to fix the metal particles in the porous polyurethane. Thirteen investigational x‐ray shields were fabricated, in which Bi2O3 particles at various mass thicknesses (ranging from 585 to 2493 g/m2) were embedded. To determine the performance of the shielding material, three criteria were evaluated: (1) Dose Reduction Factor (), measured using inverse broad beam geometry; (2) uniformity, evaluated from the standard deviation () of the x‐ray image obtained using a clinical x‐ray imaging detector; and (3) elasticity, evaluated by a compression test.ResultsThe elastic shield with small pores, containing 1200 g/m2 of the metal element (Bi), exhibited a well‐balanced performance. The was approximately 80% for 70 kV diagnostic x‐rays. This shield's elasticity was −0.62 N/mm, a loss of only 30% when compared to porous polyurethane without metal. Although the non‐uniformity of the x‐ray shield leads to poor shielding ability, it was found that the decrease in the shielding ability can be limited to a maximum of 6% when the shield is manufactured so that the of the x‐ray image of the shield is less than 10%.ConclusionsIt was verified that an elastic x‐ray shield that offers an appropriate reduction in radiation exposure can be produced by embedding Bi2O3 particles into porous polyurethane. Our findings can lead to the development of novel x‐ray shielding products that can reduce the physical and mental stress on users.

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Section: X-ray Shielding Ability Evaluationmentioning

confidence: 99%

Section: Applications and Limitationsmentioning

confidence: 99%

Section: Data Ava I L a B I L I T Y S Tat E M E N Tmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Performance of elastic x‐ray shield made by embedding Bi₂O₃ particles in porous polyurethane

Maeda,

Hayashi,

Ando

et al. 2023

Medical Physics

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Evaluation of lower detection limit and performance analyses related to the incident angle of X-rays and absolute dose using a triple-type dosimeter

Asahara,

Hayashi,

Maeda

et al. 2024

Radiation Measurements

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Effectiveness of an X-ray shielding sheet with lower shielding ability to enable both bone mineral density determination and morphological diagnosis

Maeda,

Hayashi,

Ando

et al. 2024

Radiation Measurements

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Thyroid dose reduction shield with the generation of less artifacts used for fast chest CT examination

Cited by 6 publications

References 37 publications

Performance of elastic x‐ray shield made by embedding Bi₂O₃ particles in porous polyurethane

Performance of elastic x‐ray shield made by embedding Bi₂O₃ particles in porous polyurethane

Evaluation of lower detection limit and performance analyses related to the incident angle of X-rays and absolute dose using a triple-type dosimeter

Effectiveness of an X-ray shielding sheet with lower shielding ability to enable both bone mineral density determination and morphological diagnosis

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Thyroid dose reduction shield with the generation of less artifacts used for fast chest CT examination

Cited by 6 publications

References 37 publications

Performance of elastic x‐ray shield made by embedding Bi2O3 particles in porous polyurethane

Performance of elastic x‐ray shield made by embedding Bi2O3 particles in porous polyurethane

Evaluation of lower detection limit and performance analyses related to the incident angle of X-rays and absolute dose using a triple-type dosimeter

Effectiveness of an X-ray shielding sheet with lower shielding ability to enable both bone mineral density determination and morphological diagnosis

Contact Info

Product

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Performance of elastic x‐ray shield made by embedding Bi₂O₃ particles in porous polyurethane

Performance of elastic x‐ray shield made by embedding Bi₂O₃ particles in porous polyurethane