本文由小咖机器人翻译整理

期刊来源：BMJ

原文链接：https://doi.org/10.1136/bmj-2023-077164

摘要内容如下：

目的

研究3特斯拉（T）MRI（磁共振成像）扫描仪中常见医疗保健相关物体的行为，检查其向扫描器孔自推进的能力及其组织穿透的潜力。

设计

前瞻性原位实验研究。

设置

临床3T磁共振扫描仪。定制的钻机设计和建造，以引导物体朝向扫描仪钻孔。

参与者

在医院、患者或医护人员身上或MRI扫描室附近常见的12类物体。用弹道凝胶模拟人体组织穿透（联邦调查局和北大西洋公约组织分级）。

主要结局指标

Santa（应用牛顿力学触发加速的位置）测量和物体的组织穿透深度。

结果

圣诞老人的尺寸从20便士、50便士和2英镑硬币的0厘米到刀和饼干罐的152-161厘米不等。1便士、2便士、5便士和10便士硬币在距离机架进入点>100cm处显示出朝向扫描器孔的自推进和加速度。线性回归分析显示，物体的重量与其圣诞老人测量值之间没有明显的相关性（R2<0.1）。只有五个物体穿透了弹道凝胶（模拟人体组织）。插入最深的是刀（5.5厘米），紧随其后的是茶匙（5.0厘米）、叉子（4.0厘米）、勺子（3.5厘米）和10便士硬币（0.5厘米）。虽然饼干罐没有穿透模拟人体组织，但它们产生了巨大的冲击力，可能会导致骨折。智能手机、数字温度计、金属信用卡和手写笔在几次进入MRI扫描仪后仍能完全正常工作。实验后未发现MRI扫描仪的图像质量有明显损失。

结论

该研究强调，当医疗环境中常见的物体被无意带入MRI扫描室时，可能会造成伤害（主要组织损伤和骨折）。患者和医护人员需要了解将铁磁物体带入MRI环境的相关危险。

英文原文如下：

Abstracts

OBJECTIVE  To investigate the behaviour of common healthcare related objects in a 3 tesla (T) MRI (magnetic resonance imaging) scanner, examining their ability to self-propel towards the scanner bore and their potential for tissue penetration.

DESIGN  Prospective in situ experimental study.

SETTING  Clinical 3 T MRI scanner. Customised rig designed and built to guide objects towards the scanner bore.

PARTICIPANTS  12 categories of objects commonly found in hospitals, or on patients or healthcare professionals, or near an MRI scanning room. Human tissue penetration simulated with ballistic gel (Federal Bureau of Investigation and North Atlantic Treaty Organisation graded).

MAIN OUTCOME MEASURES  SANTA (site where applied newtonian mechanics triggers acceleration) measurements and depth of tissue penetration of the objects.

RESULTS  SANTA measurements ranged from 0 cm for the 20 pence, 50 pence, and £2 coins to 152-161 cm for a knife and the biscuit tins. One penny, two pence, five pence, and 10 pence coins showed self-propulsion and acceleration towards the scanner bore at a distance >100 cm from the gantry entry point. Linear regression analysis showed no apparent correlation between the weight of the objects and their SANTA measurements (R2<0.1). Only five objects penetrated the ballistic gel (simulated human tissue). The deepest penetration was by the knife (5.5 cm), closely followed by the teaspoon (5.0 cm), fork (4.0 cm), spoon (3.5 cm), and a 10 pence coin (0.5 cm). Although the biscuit tins did not penetrate the simulated human tissue, they exerted substantial impact force which could potentially cause bone fractures. A smartphone, digital thermometer, metallic credit card, and pen torch remained fully functional after several passes into the MRI scanner. No discernible loss of image quality for the MRI scanner after the experiments was found.

CONCLUSIONS  The study highlights the potential for harm (major tissue damage and bone fractures) when commonly found objects in a healthcare setting are unintentionally brought into the MRI scanner room. Patients and healthcare professionals need to be aware of the dangers associated with bringing ferromagnetic objects into the MRI environment.

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