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在胸部和腹部计算机断层扫描中，患者体重能否代表小儿特定体型剂量估算中的身体直径？

Can Patient's Body Weight Represent Body Diameter for Pediatric Size-Specific Dose Estimate in Thoracic and Abdominal Computed Tomography?

作者信息

Kritsaneepaiboon Supika, Eng-Chuan Suwadee, Yoykaew Saowapark

机构信息

Department of Radiology, Faculty of Medicine, Prince of Songkla University, Hat Yai, Thailand.

出版信息

J Clin Imaging Sci. 2019 May 24;9:24. doi: 10.25259/JCIS-7-2019. eCollection 2019.

DOI:10.25259/JCIS-7-2019
PMID:31448175
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6702859/
Abstract

OBJECTIVE

The objective of the study was to determine whether body weight (BW) can be substituted for body diameters to calculate size-specific dose estimate (SSDE) in the children.

MATERIALS AND METHODS

A total of 196 torso computed tomography (CT) studies were retrospectively reviewed. Anteroposterior diameter (D) and lateral diameter (D) were measured, and D+D, effective diameter, SSDE diameter and SSDE were calculated. Correlation coefficients among body diameters, all SSDE types and percentage changes between CT dose index volumes and SSDEs were analyzed by BW and age subgroups.

RESULTS

Overall BW was more strongly correlated with body diameter ( = 0.919-0.960, < 0.001) than was overall age ( = 0.852-0.898, < 0.001). The relationship between CT dose index volume and each of the SSDE types ( = 0.934-0.953, < 0.001), between SSDE and all SSDE diameters ( = 0.934-0.953, < 0.001), and among SSDE diameters ( = 0.950-0.989, < 0.001) overall had strong correlations with statistical significance. The lowest magnitude difference was SSDE-SSDE.

CONCLUSION

BW can be used instead of body diameter to calculate all SSDE types, with our suggested best accuracy for SSDE and the least variation in age < four years and BW < 20 kg.

KEY MESSAGES

Size-specific dose estimate (SSDE) is a new and accurate dose-estimating parameter for the individual patient which is based on the actual size or body diameter of the patient. BW can be an important alternative for all body diameters to estimate size-specific dose or calculate SSDE in children.

摘要

目的

本研究的目的是确定在儿童中计算特定体型剂量估计值（SSDE）时，体重（BW）是否可替代身体直径。

材料与方法

回顾性分析了196例躯干计算机断层扫描（CT）研究。测量前后径（D）和侧径（D），并计算D+D、有效直径、SSDE直径和SSDE。按体重和年龄亚组分析身体直径、所有SSDE类型以及CT剂量指数体积与SSDE之间的百分比变化的相关系数。

结果

总体而言，BW与身体直径的相关性（=0.919 - 0.960，<0.001）比总体年龄与身体直径的相关性（=0.852 - 0.898，<0.001）更强。CT剂量指数体积与每种SSDE类型之间的关系（=0.934 - 0.953，<0.001）、SSDE与所有SSDE直径之间的关系（=0.934 - 0.953，<0.001）以及SSDE直径之间的关系（=0.950 - 0.989，<0.001）总体上具有很强的相关性且具有统计学意义。最小的差异幅度是SSDE - SSDE。

结论

BW可用于替代身体直径来计算所有类型的SSDE，对于年龄<4岁且体重<20 kg的儿童，我们建议其计算SSDE的准确性最高且变化最小。

关键信息

特定体型剂量估计值（SSDE）是一种基于患者实际体型或身体直径的针对个体患者的新的准确剂量估计参数。在儿童中，BW可以作为所有身体直径的重要替代指标来估计特定体型剂量或计算SSDE。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9a14/6702859/b66cc1fd88e9/JCIS-9-24-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9a14/6702859/946aaa6db00d/JCIS-9-24-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9a14/6702859/5201c7c9a934/JCIS-9-24-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9a14/6702859/e2e7fd6b8b78/JCIS-9-24-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9a14/6702859/b66cc1fd88e9/JCIS-9-24-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9a14/6702859/946aaa6db00d/JCIS-9-24-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9a14/6702859/5201c7c9a934/JCIS-9-24-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9a14/6702859/e2e7fd6b8b78/JCIS-9-24-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9a14/6702859/b66cc1fd88e9/JCIS-9-24-g004.jpg

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Radiology. 2017 Jul;284(1):219-227. doi: 10.1148/radiol.2017161530. Epub 2017 Feb 17.
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Use of Water Equivalent Diameter for Calculating Patient Size and Size-Specific Dose Estimates (SSDE) in CT: The Report of AAPM Task Group 220.
应用美国医学物理师协会（AAPM）第293号报告估算头部计算机断层扫描期间的吸收剂量：使用头围进行快速剂量估算。
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Biomed Res Int. 2020 Jul 10;2020:6046501. doi: 10.1155/2020/6046501. eCollection 2020.
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AAPM Rep. 2014 Sep;2014:6-23.
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