An MRI (Magnetic Resonance Imaging) scan uses strong magnetic fields and radio waves to create detailed images of organs and tissues inside the body. It does not involve radiation, making it a non-invasive imaging technique. The procedure itself is non-invasive and generally painless, typically involving no needles or incisions unless a contrast agent is used. While generally painless, some individuals may experience various sensations or discomforts during the process.
Understanding MRI Sensations
During an MRI scan, you will experience normal sensations, such as vibrations throughout the table or scanned body part, caused by gradient coils rapidly switching electrical currents. A slight warming sensation may also occur in the imaged area, due to radiofrequency energy absorbed by tissues, which is typically mild and safe. Some may also experience a tingling or buzzing sensation on their skin, known as peripheral nerve stimulation, caused by rapidly changing magnetic fields inducing small electrical currents. Remaining completely still is crucial, as movement can blur images and necessitate repeating parts of the scan.
Addressing Common Discomforts
While an MRI scan itself does not cause pain, common factors can lead to discomfort or anxiety for some patients. The most frequently cited discomfort is the loud noise produced by the machine. These knocking, banging, and humming sounds are generated by gradient coils vibrating rapidly within the strong magnetic field, often exceeding 90 to 100 decibels, comparable to a jackhammer.
Another significant source of discomfort is the feeling of confinement, particularly in traditional closed MRI machines. This can trigger claustrophobia or anxiety for individuals sensitive to enclosed spaces. Remaining perfectly still for the scan’s duration, which can range from 20 minutes to over an hour, can also be physically challenging. This prolonged stillness can become uncomfortable, especially for those with existing pain or conditions that make lying still difficult.
Preparing for a Comfortable Experience
There are several strategies to enhance comfort during an MRI scan. Communicating any anxieties, claustrophobia, or physical limitations with your doctor or the MRI technologist before the scan is important. They can discuss options and make necessary accommodations. To manage the loud noises, earplugs or headphones are routinely provided, and many facilities offer the option to listen to music, which can also serve as a distraction.
For those experiencing claustrophobia, several approaches can help, including choosing open or wide-bore MRI machines that offer more space. Wearing an eye mask can block the view of the enclosed space, and practicing relaxation techniques like deep breathing or meditation can promote calmness. In some cases, a doctor may prescribe a mild sedative for severe anxiety, though this requires arranging for someone to drive you home afterward. To aid in staying still, requesting blankets or pillows for support can improve comfort. On the day of the scan, you will typically be asked to change into a gown and remove all metal objects, as these can interfere with the magnetic fields and image quality.