The purpose of this study was to evaluate the dose and image to assess a shielding made of barium sulfate for the protection of supersensitive radiation eye lens and superficial breast during CT scanning. Doses were measured by CT scan of the head and chest phantoms with a polymethylmethacrylate (PMMA) phantom consisting of holes (designated in sequence at 0°, 90°, 180°, and 270°). Dose measurement of the eye lens was performed using a 16 cm head phantom and chest breast dose measurement was performed using a 32 cm PMMA body phantom. The dose was measured using a barium shield and the dose reductions in the head and chest phantoms were calculated by comparing the doses of the reference. For image evaluation, HU and noise on the left and right sides were measured by dividing them into the anterior, lateral (90°, 270°), and posterior positions. To evaluate the barium shielding image, the image was evaluated by selecting a surface plot using the ImageJ program. The head phantom dose decreased by 12.4% maximum in the anterior position (0°) and the chest phantom showed a decrease of 31.37% in the anterior (0°) and 33.63% in the lateral (90°) positions. In the comparison of noise of the image, the head phantom showed an increase of 50.43% in the anterior position. There was a significant difference in dose at positions other than the lateral (270°) and posterior (180°) positions (p < 0.05). Scanning the chest phantom in the anterior position increased the noise by up to 90.66% in the noise comparison (270°) and the posterior (180°) position showed significant differences in image (p < 0.05). In the CT scan using a barium-based shielding agent, the dose was reduced by 3.3–12.4% in the head and 3.62–33% in the chest. The barium shielding agent should be used for the examination by reducing the dose and maintaining the image quality by applying it efficiently during CT examination.

中文翻译：

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钡复合屏蔽头胸部CT剂量减量及影像质量评价

本研究的目的是评估剂量和图像，以评估由硫酸钡制成的屏蔽在 CT 扫描期间保护超敏感辐射眼晶状体和浅表乳房。剂量通过头部和胸部体模的 CT 扫描测量，其中聚甲基丙烯酸甲酯 (PMMA) 体模由孔组成（依次指定为 0°、90°、180° 和 270°）。眼睛晶状体的剂量测量使用 16 cm 头部模型进行，胸部剂量测量使用 32 cm PMMA 身体模型进行。使用钡屏蔽测量剂量，并通过比较参考剂量计算头部和胸部体模的剂量减少。对于图像评估，左侧和右侧的 HU 和噪声通过将它们分为前、侧（90°、270°）和后位置来测量。为了评估钡屏蔽图像，通过使用 ImageJ 程序选择表面图来评估图像。头部幻影剂量在前位 (0°) 最大减少 12.4%，胸部幻影在前位 (0°) 和侧位 (90°) 分别减少 31.37% 和 33.63%。在图像噪声的比较中，头部体模在前部位置增加了50.43%。在侧位 (270°) 和后位 (180°) 以外的位置剂量存在显着差异 (p < 0.05)。在噪声比较 (270°) 和后 (180°) 位置扫描前部位置的胸部体模时，噪声增加了 90.66%，图像显示出显着差异 (p < 0.05)。在使用钡基屏蔽剂的 CT 扫描中，剂量减少了 3.3-12。头部 4%，胸部 3.62-33%。检查时应使用钡屏蔽剂，通过在 CT 检查期间有效地使用它来减少剂量并保持图像质量。