Magnetic resonance imaging is a scanning technique to create detailed images of the human body. You can find more information below.
What is magnetic resonance imaging and how does it work?
Magnetic resonance imaging or MRI , also known as MRI , is a way to get detailed images of organs and tissues in the body without the need for x-rays or “ionizing” radiation. MRI uses a strong magnetic field, radio waves, rapidly changing magnetic fields, and a computer to create images that show whether an injury, disease process, or abnormal condition is present.
For MRI examination, the patient is placed inside the MRI system. The MRI system is typically a large ring-shaped device with both ends open. The strong magnetic field aligns atomic particles called protons found in most body tissues. The applied radio waves then interact with these protons to produce signals that are received by a receiver inside the scanner. Signals are produced specifically using a rapidly changing magnetic field. With the help of computer processing, images of textures are created as “slices” that can be viewed in any direction.
MRI examination does not cause pain and electromagnetic fields do not produce any type of known tissue damage. The Emar system may occasionally make loud knocking or other noises during the procedure. Earplugs are provided to avoid any problems with this noise. You will be monitored at all times and will be able to communicate with the MRI technician or MRI scanner operator via an intercom system or other means.
What is magnetic resonance imaging used for?
Magnetic resonance imaging is the procedure of choice for diagnosing numerous potential problems or abnormal conditions that can affect different parts of the body. In general, MRI creates pictures that can show differences between healthy and unhealthy or abnormal tissues. Doctors use MRI to examine the brain, spine, joints (for example, knee, shoulder, hip, wrist, and ankle), abdomen, pelvic area, breast, blood vessels, heart, and other body parts.
What are the risks of magnetic resonance imaging?
The strong magnetic field of the magnetic resonance imaging system can attract objects made of certain metals. It can cause them to move suddenly and with great force. This may pose a potential risk to the patient or object. For this reason, great care is taken not to bring metals into the area of the MRI system.
It is important to remove all metal items, including external hearing aids, watches, jewelry, cell phones, and clothing with metallic strings. Additionally, make-up, nail polish, or other cosmetic products that may contain metallic particles should be removed.
The strong magnetic field of the magnetic resonance imaging system can attract any ferrous object in the body, such as a medical implant, aneurysm clips, or drug pumps. Every MRI facility has a comprehensive scanning procedure and protocols. When these are taken care of, these steps ensure that the MRI technologist and radiologist are aware of the presence of any metallic implants and materials in the patient.
Special precautions can usually be taken. In some unusual circumstances, the examination may need to be canceled due to the presence of an unacceptable implant or device. For example, if a ferromagnetic aneurysm clip is present, imaging will not be performed as there is a risk that the clip may move and cause serious injury to the patient.
In some cases, some medical implants may become significantly warm during a magnetic resonance imaging examination as a result of the radiofrequency energy used for the procedure. This warming may cause injury to the patient. Therefore, it is very important to inform the MRI technician of any implants or other things before entering the MRI room.
The strong magnetic field of the MRI system can damage an external hearing aid. It may cause the pacemaker, electrical stimulator, or neurostimulator to malfunction or cause injury. If you have a bullet or other piece of metal in your body, there is probably a risk that it could cause an injury.
Additionally, a metallic implant or other object can cause signal loss. It can alter the MRI images, making it difficult for the radiologist to see the images correctly. Sometimes these cannot be removed, but if the radiologist knows this, they will take this into account when obtaining and interpreting the MRI images.
For some magnetic resonance imaging studies, a contrast agent known as gadolinium contrast agent can improve information in MRI images. This contrast agent is injected into the vein to help. Unlike contrast agents used in X- ray examinations or computed tomography scans, the gadolinium contrast agent does not contain iodine. Therefore, it rarely causes an allergic reaction or other problem.
You may have kidney disease, kidney failure, kidney transplant, liver disease or similar problems. In such a case, you should inform the imaging technician or radiologist before taking gadolinium contrast material. If you are unsure of these conditions, please discuss these issues with the technician or radiologist prior to imaging imaging.
How to prepare for magnetic resonance imaging?
You will typically receive a gown to wear during your magnetic resonance imaging exam. Before entering the MRI system room, you will be asked a variety of questions (ie, using a special screening form), including whether you have implants or devices.
You will then be asked to remove all metal objects on you. In addition, anyone who will go to the scan room with you will need to follow the same instructions and procedures, including filling out the same forms. If you have questions or concerns, please discuss them with the technician or radiologist prior to MRI examination.
As previously stated, you will be asked to fill out a screening form to see if anything is present that could pose a health risk or hinder an MRI examination. Substances that may pose a health hazard or other problem during an MRI include:
- medical implants
- Vascular clips
- Some external or implanted drug pumps
- some hearing aids
- Certain neurostimulation systems
- Catheters with metallic components
- Bullet, shrapnel, or other type of metal piece
- A metallic foreign body in or near the eye
Certain items such as certain pacemakers, neurostimulation systems, cochlear implants, and drug pumps may be acceptable for magnetic resonance imaging. However, the MRI technologist and radiologist must know exactly the type you have in order to follow special procedures to ensure your safety. Therefore, to assist with the pre-implantation scanning procedure, it is important that you know about any implant you may have and report it to the technician.
Items that must be removed by patients and individuals before entering the MRI system room include:
- Bag, wallet, money clip, credit cards, magnetic stripe cards
- Electronic devices such as beepers, cell phones, smartphones, and tablets
- hearing aids
- Metallic jewelry and watches
- Pens, paper clips, keys, coins
- Hairpins and some hair ointments
- Shoes, belt buckles, safety pins
- Any garment containing metallic fibers or threads, metal zippers, buttons, snaps, or hooks
Objects that can degrade image quality if they are close to the scanned area include:
- metallic spine bar
- Plates, pins, screws, or metal mesh used to repair a bone or joint
- joint replacement or prosthesis
- Metallic jewelry, including those used for body piercing or body modification
- Some tattoos or tattooed eyeliner
- Make-up, nail polish, or other cosmetics containing metal
- Dental fillings or braces