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首页> 外文期刊>International Journal of Medical Imaging >The Relationship of CT Mean Modulated Dose-Length Product and Body Mass Index During Routine 18F- FDG PET/CT Studies
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The Relationship of CT Mean Modulated Dose-Length Product and Body Mass Index During Routine 18F- FDG PET/CT Studies

机译：常规18F-FDG PET / CT研究中CT平均调制剂量长度乘积与体重指数的关系

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AIM: To determine the relationship of body mass index (BMI) on the mean dose length product (DLP) values acquired using modulated (automatic exposure control) and standard computed tomography (CT) scanning protocols as part of a typical ~(18)F-FDG PET/CT study. METHODS: A retrospective study was performed and the dose-length product and BMI values from routine ~(18)F-FDG PET/CT scans of 51 patients were recorded. The scans were performed on a 16-slice PET/CT scanner by using an automatic exposure control (AEC) system. DLP, BMI, age, sex and number of bed positions were documented for each patient. RESULTS: Twenty-four women and 27 men were included in the study (mean age, 52.5 years). The mean BMI was 24.76 kg/m~2. The mean modulated DLP was 528.25 mGy/cm. Patients were grouped according to BMI (normal: BMI <25, overweight: BMI 25 - 30, obese: BMI >30) and age (≤18 years, 19 - 59 years, ≥ 60 years). The mean modulated DLP decreased by 22.77% for patients in the normal BMI group (P < 0.001). The obese group of patient's mean modulated DLP was 26.29% higher (P < 0.01). The DLP decreased by 22.43% for patients aged 60 years and above compared with patients in the 19 - 59 age group. CONCLUSION: The use of modulated scanning protocol significantly reduces the integrated dose received from a whole body CT scan for patients with a BMI < 25. Increasing patient size (BMI >25) significantly increases the integrated dose received. The possible change in body composition with age may also indicate a reduction in dose received from a whole body CT scan using AEC.
机译：目的：确定体重指数（BMI）与使用调制（自动曝光控制）和标准计算机断层扫描（CT）扫描协议作为典型〜（18）F的一部分获取的平均剂量长度乘积（DLP）值的关系-FDG PET / CT研究。方法：进行回顾性研究，并记录51例患者常规〜（18）F-FDG PET / CT扫描的剂量长度乘积和BMI值。使用自动曝光控制（AEC）系统在16层PET / CT扫描仪上进行扫描。记录每位患者的DLP，BMI，年龄，性别和床位数量。结果：该研究包括24名女性和27名男性（平均年龄，52.5岁）。平均BMI为24.76 kg / m〜2。平均调制DLP为528.25 mGy / cm。根据BMI（正常：BMI <25，超重：BMI 25-30，肥胖：BMI> 30）和年龄（≤18岁，19-59岁，≥60岁）对患者进行分组。正常BMI组患者的平均调制DLP下降了22.77％（P <0.001）。肥胖组患者的平均调节DLP高26.29％（P <0.01）。与19-59岁年龄段的患者相比，60岁及以上年龄段的患者的DLP降低了22.43％。结论：对于BMI <25的患者，使用调制扫描协议可显着降低从全身CT扫描获得的累计剂量。增加患者人数（BMI> 25）可以显着增加所接收的累计剂量。随着年龄的增长，身体成分的可能变化也可能表明使用AEC进行的全身CT扫描所收到的剂量减少。

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