Metallic items may affect MRI testsOctober 11, 2014
Karachi: Senior radiologists working in Radiology Department of major public healthcare Karachi said that some metallic instrument might cause interference in Magnetic Resonance Imaging (MRI) and Computerized Tomography (CT scan) procedure results if such instrument cannot remove before going to procedure.
Senior RMO Administrative, Radiology Department, Civil Hospital Karachi, Dr Aijaz. A. Zubedi said some metallic instruments like dental implant, jewelry, watches; cochlear (ear) implant, hearing aids, hairpins, pen and other metallic accessories might affect the MRI and CT scan procedures during conducting procedures.
He said metallic accessories should be left at home if possible, or removed prior to the MRI scan. Because they can interfere with the magnetic field of MRI unit. Metal and electronic objects are not allowed during tests. He explained MRI is used to find joint problems and other diseases.
He said in most cases, people with the following implants cannot be scanned and they should not enter the MRI scanning area unless clearly instructed to do so by a radiologist or technologist aware of the presence of any of the following. He said some women wear embroidery dress with designing of lenses which may cause interference in procedure during MRI.
Dr Aijaz said people should tell the technologist if he/she had medical or electronic devices in your body, because they may interfere with the exam or potentially pose a risk. He said tooth fillings and braces usually were not affected by the magnetic field, but they may disfigure images of the facial area or brain, so the radiologist should be aware of them.
He said skilled technicians always use detectors to scan the patients in hospital before going to MRI and CT scan procedure. He said: “Doctors and staff are aware of the sensitivity of all procedure but there is dire need of creating the awareness at public level.”
In-charge, Radiology Department, Jinnah Postgraduate Medical Center, Prof Tariq Mehmood, said MRI procedure could not be possible with metallic instruments. He said staff generally remove such instruments before MRI as machine could not perform procedure until the removal of metallic accessories. He said MRI machine catches the metallic instruments. He said defect in report could not be possible as technicians used detectors before procedure.
Radiation Protection Officer (RPO), CHK, Muhammad Tariq, said cell phones, gold, magnet and other metallic instruments may cause interference the procedure during MRI and CT scan. He said this interfered procedure called false positive in medical terms. He said cell phones non-ionizing radiation may interfere the procedure as MRI had ionizing rays.
He advised the people to avoid wearing metallic accessories during MRI and CT scan procedure as it may affect the diagnosis of diseases.