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My dad was scheduled for his first MRI scan the other day, and as the designated family technical expert, Pop had plenty of questions for me about what to expect. I told him everything I knew about the process, having had a few myself, but after the exam he asked the first question that everyone seems to ask: “Why is that thing so damn loud?” Sadly, I didn’t have an answer for him. I’ve asked the same question myself after my MRIs, hoping for a tech with a little more time and lot more interest in the technology he or she uses to answer me with more than the “it’s the machine that makes the noise” brush-off.

Shop the most comprehensive catalog of medical supplies for radiology technologists online, featuring protective apparel, shields, x-ray markers, and more. Open-Bore Technology: Throughout the Shields network, 17 locations offer high-field, open-bore MRI machines, including two advanced 3T open-bore MRIs. These machines have wide opening and a short bed, so, for scans below the chest, most patients can be scanned with their head out of the machine.

MRI is one of those technologies that I don’t feel I have a firm enough grasp on, and it seems like something I should really be better versed in. So I decided to delve into the innards of these modern medical marvels to see if I can answer this basic question, plus see if I can address a few more complicated questions. Spin Doctors Magnetic Resonance Imaging is based on the technique of. NMR uses powerful magnets to align a chemical sample’s atomic nuclei and then tickle them RF waves, revealing structural and chemical properties of the sample under test. NMR spectroscopy has been used for decades to explore the structure of matter; almost every academic or industrial chemistry lab has access to NMR nowadays.

An MRI scanner uses the principles of NMR to map the water molecules in the body by probing for the single proton in the nucleus of hydrogen atoms. A large superconducting magnet produces a strong and stable magnetic field down the long axis of the core of the scanner. Mac torrent download software. When a patient is put into the machine — fair warning to claustrophobics that this is not going to be a happy time for you — the magnetic field gets to work on the protons in the water (and fat) in the patient’s tissues. Each proton has a quantum property called spin, which is a little like the Earth spinning on its axis. Outside of a magnetic field, each proton’s spin axis is randomly oriented, but inside the field, everything snaps into alignment. A little more than half the protons are oriented toward the patient’s head, which is the low energy state, and the rest are aligned toward the feet, which is a slightly higher state and therefore less favored. The result is a slight net spin moment oriented toward the head, meaning that your body is turned into a bar magnet during the exam.

Once the protons are all lined up, a powerful pulse of RF energy is transmitted into the tissue being studied. The exact parameters depend on the study being conducted, but typically the frequency is in the 10 to 100 MHz range at a power of 10 to 30 kW. It’s akin to putting your precious self a few inches from the antenna of a shortwave radio station, which is almost never a good idea. But the RF is rapidly pulsed during the exam, which reduces the duty cycle and decreases exposure risk. But there are cases where significant heating can occur in a patient’s tissues as a result of the radio pulses, to the point where specific positions are forbidden to prevent RF loops that could lead to internal heating, and there are guidelines for reporting “heating events.” I’ve felt this myself; during my last MRI my wedding ring, which was overlooked in the pre-exam search for metal, heated up to the point where I almost asked the tech to stop the exam.