Study on the Radiation Dose Distribution of Abdominal CT Scans Based on Dose Simulation Humans
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摘要:
目的：本研究旨在通过利用剂量模拟人系统性地测量和分析腹部CT扫描在腹部以及体表关注部位的辐射剂量分布，并提供相关数据，以便评估患者的辐射风险并制定个性化的辐射保护策略。方法：本研究使用剂量模拟人模拟常规临床腹部CT扫描过程，选取剂量模拟人42个组织检测点和8个体表位点分别指代躯干部位主要器官和体表主要关注部位；使用RGD-3B热释光测量仪测量人体躯干部主要脏器及体表关键部位的受照剂量水平。结果：根据剂量模拟人实验数据分析，胃部受照剂量最大，为15.9 mGy，其次是肾脏和胰腺部位，分别为15.7 mGy和14.4 mGy。肾上腺、胆囊和肝左叶的受照剂量分别为14.3、13.2和12.9 mGy。除上述器官外，其余部位的受照剂量均小于6.9 mGy；体表关注部位的受照剂量测量结果显示左侧眼晶状体受照剂量为0.017 mGy，右侧眼晶状体为0.029 mGy；甲状腺部位的受照剂量左右侧分别为0.062 mGy和0.057 mGy；乳腺部位左侧和右侧的受照剂量分别为1.71 mGy和1.58 mGy；左右侧性腺部位的受照剂量分别为0.145 mGy和0.090 mGy；乳腺下缘作为CT扫描时临近皮肤的入射部位，显示出皮肤入射剂量水平为1～2 mGy。结论：在腹部CT扫描过程中，胃部、肾脏和胰腺的辐射剂量最高；尽管体表敏感部位的受照剂量较低，但甲状腺、性腺和晶状体等部位的辐射量仍高于其他体表组织。这些结论提示工作人员在特定高剂量区域可能仍需进一步防护，以减少潜在的辐射危害。
Abstract:Objective: This study aimed to systematically measure and analyze the radiation dose distribution in the abdomen and specific areas of interest on the body surface during abdominal CT scans using a dose simulation phantom, providing relevant data to assess patient radiation risks and to develop personalized radiation protection strategies. Methods: The study simulated routine clinical abdominal CT using a dose simulation phantom. Forty-two tissue detection points and eight surface points on the phantom were selected to represent major organs in the trunk and key areas of concern on the body surface. RGD-3B thermoluminescence was used to measure the dose level of the main organs and key parts of the body surface. Results: Experimental data from the dose simulation phantom were analyzed and indicated that the stomach received the highest radiation dose at 15.9 mGy, followed by the kidneys and pancreas, at 15.7 mGy and 14.4 mGy, respectively. The doses for the adrenal glands, gallbladder, and left lobe of the liver were 14.3, 13.2, and 12.9 mGy, respectively. All other areas received doses < 6.9 mGy. Surface area dose measurements showed that the left and right eye lens received a dose of 0.017 and 0.029 mGy, respectively. The dose for the thyroid was 0.062 mGy and 0.057 mGy on the left and right sides, respectively. The doses to the left and right breasts were 1.71 mGy and 1.58 mGy, respectively. The gonads received doses of 0.145 mGy and 0.090 mGy on the left and right sides, respectively. The skin entry dose at the lower edge of the breast, which is near the skin during CT scans, was between 1 and 2 mGy. Conclusion: During abdominal CT, the stomach, kidneys, and pancreas received the highest radiation doses. Although the radiation dose of sensitive areas on the body surface is lower, that in the thyroid, gonads, and lens remain higher than that in other surface tissues. These findings suggest that workers may need further protection in specific high-dose areas to reduce potential radiation hazards.
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Keywords:
- CT /
- absorbed dose /
- phantom
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图 2 剂量模拟人21～34层对应解剖范围及第21层组织剂量点编号图像
Figure 2. Dose simulation of human layer 21~34 corresponding anatomical range and layer 21 tissue dose point number image.
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图 3 CT扫描体表关注部位的吸收剂量水平及其分布状况
Figure 3. The absorption dose levels and their distribution in the regions of interest on the body surface during CT scans
表 1 CT扫描人体躯干部位主要脏器的受照剂量分布水平
Table 1 Distribution of radiation dose levels to major visceral organs in the human trunk during CT scans
序号 编号 模体内TLD探
测位置对应的
组织器官吸收剂量
/mGy序号 编号 模体内TLD探
测位置对应的
组织器官吸收剂量
/mGy1 2108 肝左叶 12.924 22 2927 右髂内、外动静脉 0.878 2 2109 肝左叶 12.502 23 2929 左髂内外动脉 0.866 3 2213 胃 15.007 24 3028 右髂外动静脉，盲肠 0.590 4 2312 胰体 14.410 25 3036 右卵巢 0.512 5 2320 肾上腺 14.320 26 3037 直肠 0.507 6 2409 胆囊 13.206 27 3126 膀胱 0.355 7 2419 左肾 15.716 28 3132 右卵巢 0.330 8 2503 横结肠 5.168 29 3133 子宫底 0.334 9 2513 降结肠 6.928 30 3134 左卵巢 0.305 10 2610 升结肠 3.160 31 3142 直肠 0.315 11 2620 左肾 3.734 32 3225 膀胱 0.220 12 2712 回肠 2.120 33 3230 子宫体 0.212 13 2714 下腔静脉 2.144 34 3236 直肠 0.211 14 2715 髂总动脉 2.196 35 3327 右闭孔神经 0.109 15 2716 输尿管 2.108 36 3328 左闭孔神经 0.117 16 2717 空肠 1.718 37 3334 膀胱 0.140 17 2804 小肠 1.309 38 3340 直肠 0.143 18 2823 右髂总动静脉 1.230 39 3413 右股动、静脉 0.079 19 2824 左髂总动静脉 1.310 40 3418 左股动、静脉 0.079 20 2907 小肠 0.886 41 3438 尿道 0.087 21 2909 乙状结肠 0.904 42 3444 直肠 0.090 注：表中编码对应组织层编号和在该层的组织关注位点编号，如“2108”，表示仿真模体的第21层第08号位点。 
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