What is an MRI machine? An MRI machine looks like a large doughnut with a hole in one end. The patient lies on a table attached to the machine. The lab assistant helps them get comfortable by explaining the procedure to them. The table slides into the doughnut-shaped opening of the MRI machine, allowing the patient to lie on the table while the scan is taking place. The patient only goes into the machine to get images of the part of their body that needs to be scanned.
MRI images are constructed using radio waves that reflect back reflected radio waves from objects inside the body. While these waves are not harmful, they do produce a magnetic field that can cause changes in the tissue around the subject. This radio frequency coil picks up the energy emitted by the hydrogen atoms and builds a two-dimensional image. This information can be used to study different organs and tissues within the body. The process is safe, but it can cause some discomfort for those who suffer from claustrophobia. However, most patients will manage to undergo the scan without feeling a thing.
An MRI scan may be accompanied by a contrast dye, which helps doctors visualize certain parts of the body. The contrast dye is typically administered through an IV, which is inserted into the upper arm. A radiologist will review the images and send them to a doctor. The patient should avoid wearing any metal items during an MRI scan, as the strong magnetic field of the machine can damage internal metal devices. Patients should also be very still during the MRI scan, since any movement can result in a blurred image.
An MRI machine can be loud, with sound intensity up to 120 decibels. The machine may also cause nerve stimulation, which can result in a twitching sensation. However, this is the only danger associated with undergoing an MRI. So, if you are worried about the results of the test, do not let this worry get the best of you. You may feel a strange sensation, but it will be worth the risk.
MRI machines are used in detecting tumors and other illnesses. The technology involves the use of radio waves and powerful magnets. The magnets generate a strong magnetic field that forces the protons of the body to align with the magnetic field. Radio waves are then sent through coiled wires to create a temporary magnetic field. The sensor detects the energy released when the protons realign with the magnetic field. The length of time it takes for this process depends on the chemical composition of the body and the environment in which the scan takes place.
The MRI machine employs a strong magnetic field that extends outside the MRI machine to collect images. Because of this, it can cause a wheelchair to fling across the room! Before an MRI, patients should inform their physicians about any implanted device. In addition to pacemakers, vagus nerve stimulators, and capsule endoscopy should not be worn inside the MRI machine. If the patient is pregnant, she should not undergo an MRI.