MRI scans typically take 20–35 minutes. While the operation is pleasant, a little amount of anesthetic is necessary to keep your pet absolutely motionless during the process. Each MRI examination is tailored to produce the greatest quality pictures in the shortest period of time under anesthesia. Generally, multiple images are taken over several hours to show movement inside the body. Images are viewed on a computer and may be printed for diagnosis purposes.
The most common location for imaging dogs' brains is through their skulls. The head region is shielded from outside sources of radiofrequency (RF) energy by lead shielding constructed from metal plates inserted into the skin between the skull and the rest of the body. This method of protection prevents excessive heating of other parts of the body while allowing the brain to be scanned safely.
A magnetic resonance image (MRI) uses a powerful magnet, radio waves, and a computer to create detailed pictures of the organs inside the body. These pictures are created without using any ionizing radiation such as x-rays or CT scans. MRIs do not expose patients to harmful levels of radiation. Instead, they use strong magnets and radio frequencies that are safe for living tissue.
An MRI scanner consists of large magnets that produce a very stable magnetic field that surrounds the patient. It also includes components for generating high-energy radio waves that trigger nuclear reactions in certain atoms within the patient's body.
An MRI normally takes 30 to 60 minutes. If contrast is used, the exam may take longer. When you arrive, the staff will tell you how long the exam should take. They may also explain any special steps we need to take before the scan begins.
During the exam, you will lie on a table that slides into a large magnet. A computer connected to the magnet uses magnetic fields to detect different tissues under the skin. These tissues include muscles, fat, bone, and some organs such as the heart and brain. The computer produces images based on these measurements that allow doctors to see inside your body.
MRI scans are more sensitive to motion than ordinary X-rays. This is because muscles move when they contract, and the only way to see this movement is with a sequence of images taken over time. Thus, it is important not to move or make any unnecessary sounds during the scan. You may want to write down questions that come to mind and ask them later once the scan is finished.
The exam itself takes about an hour and a half. However, the rest of the day is usually spent reading results from your scan and discussing options with your doctor. Most people can go home after this appointment. However, for young children who may be anxious about being in the magnet, the hospital may recommend staying the night.
Without a contrast injection, a spine MRI normally takes 15–25 minutes. If a contrast injection is required, the overall duration is 30–35 minutes. You will be advised to remain still since MRI images are sensitive to motion and any movement may obscure information used by the radiologist to generate a formal report.
During an MRI examination of the spine, it is important to keep still because moving parts show up better on magnetic resonance images. Also, some areas that might not be visible if you move around during the scan can be seen with greater clarity if you lie quietly for a few minutes before the procedure begins.
The total scanning time for an MRI of the spine is about an hour. It usually takes longer if there is a need to collect more data from multiple slices of the body or if the patient moves around during the scan.
While waiting for the scan to finish, you will be given instructions on how to stay as still as possible and not to move until told otherwise. Some people like listening to music or watching a movie to pass the time while others go for a walk outside. All of these things are fine so long as you do not block the scanner or interfere with image quality.
When the scan is finished, the radiographer will release you after checking your blood pressure and heart rate. These are very important factors when examining patients with cardiovascular problems.
During the MRI, the person in charge of the machine will keep an eye on you from another room. The exam usually lasts 30 to 60 minutes, although it might take longer. If anything unusual happens during the scan, the technician will stop the procedure and notify the doctor who ordered it.
Most MRIs of the lumbar spine are done with you lying on a table that slides into the center of the magnet. But some people may be asked to lie on their stomach or back instead.
The MRI machine uses strong magnets to create pictures of your body without injuring yourself with a needle. It works by sending pulses of energy through the magnet into your body, which makes certain parts such as bones or tumors visible on the images produced by the scanner.
Prior to the test, you may be given a mild sedative or anesthesia to help you relax while reducing pain caused by the strong magnetic field. This is especially important if you have metal implants such as heart valves or joint replacements.
While the test is being performed, the technician will watch you for any signs of discomfort or anxiety and stop the procedure if necessary. They will also be watching for any signs of injury such as bleeding from wounds or blood in the urine or stool.
The MRI might last anywhere from 85 to 120 minutes, while your ultrasound should last no more than 90 minutes. The length of the exam depends on how many images you need and what part of your body is being scanned.
Your doctor will likely tell you how long it takes to do a brachial plexus MRI after you have asked all your questions. He or she may also explain why the test lasts for several hours. It's important for you to be aware of any factors that could affect the length of the exam, such as your body type (for example, if you have large muscles they can cause longer scanning times), so you can plan your day accordingly.
During the exam, you will probably be asked to lie down in a narrow tube-like machine called a scanner. There are various types of scanners used in MRIs; some are larger than others. The type used in your exam is called a whole-body scanner because it can view the entire body at once.
While inside the scanner, you will be given a series of commands to hold up different parts of your body so the computer can create detailed pictures of them.