Doctor insights on:
Does An Mri Expose Me To Any Unnecessary Radiation
No: Mri (magnetic resonance imaging) uses magnetic fields rather than radiation. That is one of the benefits of using MRI instead of ct ("cat scans") or x rays. As far as we know, exposure to this level of magnetic energy is not harmful. If you have a pacemaker, cochlear implant, implanted nerve stimulator, or other metal in your body, you may not be able to have an mri. ...Read moreSee 2 more doctor answers
Mri or magnetic resonance imaging is one of the more recently developed imaging modalities available to physicians. It uses powerful magnets to generate images. There is no ionizing radiation which is a major advantage over many other modalities. Mri is the best imaging exam that we have for most soft tissue and joint related problems. There are radiologists ...Read more
MRI doesn't: Use ionizing radiation (used with ct scans and plain x-rays studies). It uses magnetic fields to make images and these have not been shown to harm the human body. That said, patients with certain kinds of pacemakers and other implanted devices can't be imaged with MRI because of the potential to disrupt the device or otherwise harm the patient. ...Read more
Think about it.....: Think about the time exposure issue - if nothing else. Actually the probability that it's the exact same type is low, but... Most will have no more than a very few MRIs in their lifetime and most spend from an hour to several hours a day on their cell. That's often 365 days per year. It's not hard to see a difference. ...Read more
Results of my last MRI were inconclusive and suggested another with contrast. PCP suggests that its too much radiation for my body. How so? 1 more ok?
Physics: The physical phenomena on which these imaging techniques are built are very different, each is best suited for different purposes. Cat scans are sophisticated x ray, they rely on the degree of absorption of gamma rays (bones, ca, other metals will contrast most). Mri is better for softer tissue imaging because it depends more on the behavior of hydrogen atoms and h2o in the strong magnetic field. ...Read more
Frequency is a key: issue because energy per photon correlates with the frequency of EMR. Study: https://en.wikipedia.org/wiki/Electromagnetic_radiation. Additionally, issue is not just EMR energy transmitted but absorbed (versus just passing through without apparent effect) combined with biologic responses, thus no one 100% understands. MRI (actually NMRI) uses intense magnetic fields & RF EMR, not ionizing like CT. ...Read more
Can scarring or cirrosis of liver be diagnosed by ultrasound and mri?I m scared of CT because of radiation.
Cirrhosis: This condition can only be suggested by imaging studies, including ct. The only definitive way is by liver biopsy. If, however, there is cirrhosis the secondary effects of that will suggest its presence. You do not need imaging for that except out of curiosity. If you have history of liver damaging conditions and secondary changes, the odds are overwhelming and not sure ct will help anything. ...Read moreSee 1 more doctor answer
This is light of extremely short wavelengths typically produced either among the stars / in cosmic rays or by radioactive element decay. Gamma rays form the background of normal radiation in which we all live; it is substantially greater than the exposure we get from imaging scans or should get from ...Read more
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