Contrast dye is injected, and the scanner immediately starts taking pictures. Prior to or during surgery, fMRI may be useful for showing which areas of the brain control important functions so that these areas can be avoided during the procedure.Дynamic CT or Dynamic MRI: Advances in computer technology have made it possible to use existing scanning equipment to measure cerebral blood volume (CBV) and cerebral blood flow (CBF). The increased speed shows how oxygen is used in the brain. FS MRI can be useful in planning the surgical removal of a skull base tumor, spinal cord tumor, or a tumor causing hydrocephalus (fluid buildup on the brain).ДЇunctional MRI (fMRI): fMRI produces MRI images in a faster sequence than traditional MRI. Signals are generated from the magnetic field and fed into a computer, which creates a picture of the brain.ДЇlow-Sensitive MRI (FS MRI): This type of combines functional MRI with images of cerebrospinal fluid (CSF) flow. The patient lies on a table that slides into the scanner, where a magnetic field surrounds the head. Magnetic Resonance Imaging (MRI): The MRI scanner is a tunnel-shaped piece of equipment. Thousands of x-ray readings are then fed into the computer, which brings the information together into a picture of the brain. The CT scanner circles the head so that x-rays penetrate the brain from many directions. The patient lies on a table that slides into a doughnut-shaped opening in a scanning device. Scanning techniques include:Д¬omputed Tomography (CT): This scan combines an x-ray-type device with a computer. MRI scanners also come in varying sizes including open and wide-open.The purpose of a scan is to give your doctor a closer look at your brain and to provide information that will assist in your diagnosis. The higher the вЂњTвЂќ the greater the image quality and resolution.В However, too much detail can be inappropriate or unnecessary parts of the anatomy. MRI scanners come in different magnet field strengths measured in teslas or вЂњTвЂќ, usually between 0.5T and 3.0T. There is no radiation, the exam is painless, and there are no harmful side effects. What are the benefits and risks of an MRI procedure?ДЄn MRI is able to visualize internal organs that are difficult or impossible to see with other diagnostic exams. Your referring doctor will schedule a visit with you to discuss the results of your test. However, for patient comfort, we provide all patients with earplugs so that the noise is dampened. You may hear loud sounds while the pictures are taken. Most MRI studies take between 30 and 60 minutes and you will be able to communicate with the technician during the procedure. This type of scan helps differentiate between healthy and diseased tissue, making it possible to accurately diagnose many diseases in their early stages. Talk to your health care provider about this before you have your MRI.ДЇor some MRI scans, a contrast medium (gadolinium) is injected to highlight certain tissues for closer examination. If you get nervous when you are in small closed spaces, you can opt to have your MRI performed in a Wide-Open MRI which gives extra space around your body or an Open MRI that is a less enclosed space. You will lie down on a cushioned bed that moves into a donut-shaped apparatus that is open on both ends. It is also useful for injuries involving the shoulder, back or neck. For example, an MRI may show whether you have torn ligaments or torn cartilage in your knee and help your health care provider decide whether you need surgery. MRI is also helpful in diagnosing diseases and disorders of the eyes and ears. It is often used to fully visualize and diagnose problems within your joints and other soft tissues. Health care providers use MRI to diagnose problems in the brain and spinal cord, to see the size and location of tumors. While an X-ray is very good at showing bones, an MRI lets your health care provider see structures made of soft tissue, such as tendons, bone marrow, ligaments and cartilage, and organs in your chest, abdomen and pelvis. The test uses a powerful magnetic field, radio waves and a computer to create images in cross-section. Magnetic resonance imaging (MRI) is a special diagnostic test that produces very clear, detailed pictures of internal organs and structures in your body.

Types of mri scanners