| Autor: |
Ong, Shao J, Chia, Koon Liang, See, Teik Choon, Graves, Martin, Hoon, Desmond, Hang, Joanne, Teo, Lycia, Su, Peijing, Hallinan, James T P D, Ong, Michael, Ang, Bertrand, Quek, Swee Tian |
| Zdroj: |
BMJ (British Medical Journal); 2023, Vol. 383 Issue: 12 pe077164-e077164, 1p |
| Abstrakt: |
ObjectiveTo 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.DesignProspective in situ experimental study.SettingClinical 3 T MRI scanner. Customised rig designed and built to guide objects towards the scanner bore.Participants12 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 measuresSANTA (site where applied newtonian mechanics triggers acceleration) measurements and depth of tissue penetration of the objects.ResultsSANTA 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.ConclusionsThe 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. |
| Databáze: |
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