{"id":52874,"date":"2025-04-25T22:09:15","date_gmt":"2025-04-26T02:09:15","guid":{"rendered":"https:\/\/www.hancockhealth.org\/mayo-health-library\/mri\/"},"modified":"2026-02-04T12:12:44","modified_gmt":"2026-02-04T17:12:44","slug":"mri","status":"publish","type":"mayo","link":"https:\/\/www.hancockhealth.org\/zh\/mayo-health-library\/mri\/","title":{"rendered":"\u6838\u78c1\u5171\u632f\u6210\u50cf"},"content":{"rendered":"<div class=\"container mx-auto   wordpress-block wordpress- core-\">\n<p>Magnetic resonance imaging (MRI) is a medical imaging technique that uses a magnetic field and computer-generated radio waves to create detailed images of the organs and tissues in your body.<\/p>\n<p>Most <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> machines are large, tube-shaped magnets. When you lie inside an <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> machine, the magnetic field inside works with radio waves and hydrogen atoms in your body to create cross-sectional images &mdash; like slices in a loaf of bread.<\/p>\n<p>\u9019 <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> machine also can produce 3D images that can be viewed from different angles.<\/p>\n<p><abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> is a noninvasive way for a medical professional to examine your organs, tissues and skeletal system. It produces high-resolution images of the inside of the body that help diagnose a variety of conditions.<\/p>\n<h3>MRI of the brain and spinal cord<\/h3>\n<p><abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> is the most frequently used imaging test of the brain and spinal cord. It&#8217;s often performed to help diagnose:<\/p>\n<ul>\n<li>Aneurysms of cerebral vessels.<\/li>\n<li>Conditions of the eye and inner ear.<\/li>\n<li>Multiple sclerosis.<\/li>\n<li>Spinal cord conditions.<\/li>\n<li>Stroke.<\/li>\n<li>Tumors.<\/li>\n<li>Brain injury from trauma.<\/li>\n<\/ul>\n<p>A special type of <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> is the functional <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> of the brain, also known as fMRI. It produces images of blood flow to certain areas of the brain. Functional <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> can be used to examine the brain&#8217;s anatomy and show which parts of the brain are handling critical functions, language and movements. This information can help guide decisions when considering someone for brain surgery.<\/p>\n<p>Functional <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> also can check for damage from a head injury or from conditions such as Alzheimer&#8217;s disease.<\/p>\n<h3>MRI of the heart and blood vessels<\/h3>\n<p><abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> that focuses on the heart or blood vessels can check:<\/p>\n<ul>\n<li>Size and function of the heart&#8217;s chambers.<\/li>\n<li>Thickness and movement of the walls of the heart.<\/li>\n<li>Extent of damage caused by heart attacks or heart disease.<\/li>\n<li>Structural problems in the aorta, such as aneurysms or dissections.<\/li>\n<li>Inflammation or blockages in the blood vessels.<\/li>\n<\/ul>\n<h3>MRI of other internal organs<\/h3>\n<p><abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> can check for tumors or other irregularities in many organs in the body, including the following:<\/p>\n<ul>\n<li>Liver and bile ducts.<\/li>\n<li>Kidneys.<\/li>\n<li>Spleen.<\/li>\n<li>Pancreas.<\/li>\n<li>Uterus.<\/li>\n<li>Ovaries.<\/li>\n<li>Prostate.<\/li>\n<\/ul>\n<h3>MRI of bones and joints<\/h3>\n<p><abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> can help look for:<\/p>\n<ul>\n<li>Joint issues caused by traumatic or repetitive injuries, such as torn cartilage or ligaments.<\/li>\n<li>Disk problems in the spine.<\/li>\n<li>Bone infections.<\/li>\n<li>Tumors of the bones and soft tissues.<\/li>\n<\/ul>\n<h3>MRI of the breasts<\/h3>\n<p><abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> can be used with mammography to detect breast cancer, particularly in people who have dense breast tissue or who might be at high risk of the disease.<\/p>\n<p>Because <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> uses powerful magnets, the presence of metal in your body can be a safety hazard if attracted to the magnet. Even if not attracted to the magnet, metal objects can distort the <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> images. Before having an <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> exam, you&#8217;ll likely complete a questionnaire that includes whether you have metal or electronic devices in your body.<\/p>\n<p>Unless the device you have is certified as <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> safe, you might not be able to have an <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr>. Devices include:<\/p>\n<ul>\n<li>Metallic joint prostheses.<\/li>\n<li>Artificial heart valves.<\/li>\n<li>An implantable heart defibrillator.<\/li>\n<li>Implanted drug infusion pumps.<\/li>\n<li>Implanted nerve stimulators.<\/li>\n<li>A pacemaker.<\/li>\n<li>Metal clips.<\/li>\n<li>Metal pins, screws, plates, stents or surgical staples.<\/li>\n<li>Cochlear implants.<\/li>\n<li>A bullet, shrapnel or any other type of metal fragment.<\/li>\n<li>Intrauterine device.<\/li>\n<\/ul>\n<p>If you have tattoos or permanent makeup, ask whether it might affect your <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr>. Some of the darker inks contain metal.<\/p>\n<p>Before you schedule an <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr>, tell your doctor if you think you&#8217;re pregnant. The effects of magnetic fields on an unborn baby aren&#8217;t well understood. An alternative exam may be recommended, or the <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> may be postponed. Also tell your doctor if you&#8217;re breastfeeding, especially if you&#8217;re to receive contrast material during the procedure.<\/p>\n<p>It&#8217;s also important to discuss kidney or liver problems with your doctor and the technologist, because problems with these organs might limit the use of injected contrast agents during your <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> scan.<\/p>\n<p>Before an <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> exam, eat as you would normally and continue to take your usual medicines, unless you&#8217;re told otherwise. You will typically be asked to change into a gown and to remove things that might affect the magnetic imaging, such as:<\/p>\n<ul>\n<li>Jewelry.<\/li>\n<li>Hairpins.<\/li>\n<li>Eyeglasses.<\/li>\n<li>Watches.<\/li>\n<li>Wigs.<\/li>\n<li>Dentures.<\/li>\n<li>Hearing aids.<\/li>\n<li>Underwire bras.<\/li>\n<li>Cosmetics that contain metal particles.<\/li>\n<\/ul>\n<h3>During the test<\/h3>\n<p>\u9019 <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> machine looks like a long narrow tube that is open on both ends. You lie down on a movable table that slides into the opening of the tube. A technologist monitors you from another room. You can talk with the technologist by microphone.<\/p>\n<p>If you have a fear of enclosed spaces, called claustrophobia, you might receive a drug to help you feel sleepy and less anxious. Most people get through the exam without difficulty.<\/p>\n<p>\u9019 <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> machine creates a strong magnetic field around you, and radio waves are directed at your body. The procedure is painless. You don&#8217;t feel the magnetic field or radio waves, and there are no moving parts around you.<\/p>\n<p>During the <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> scan, the internal part of the magnet produces repetitive tapping, thumping and other noises. Wearing earplugs or having music playing can help block the noise.<\/p>\n<p>In some cases, a contrast material, typically gadolinium, will be injected through an intravenous (IV) line into a vein in a hand or arm. The contrast material helps make certain details clearer. Gadolinium rarely causes allergic reactions.<\/p>\n<p>\u4e00\u500b <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> exam can last anywhere from 15 minutes to more than an hour. You must hold still because movement can blur the images.<\/p>\n<p>During a functional <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> exam, you might be asked to perform a few small tasks &mdash; such as tapping your thumb against your fingers, rubbing a block of sandpaper or answering simple questions. This helps pinpoint the portions of your brain that control these actions.<\/p>\n<h3>\u6e2c\u8a66\u5f8c<\/h3>\n<p>If you haven&#8217;t been sedated, you can resume your usual activities immediately after the scan.<\/p>\n<p>A doctor specially trained to interpret <abbr title=\"Magnetic resonance imaging\">\u6838\u78c1\u5171\u632f\u6210\u50cf<\/abbr> scans, called a radiologist, will look over the images from your scan and report the findings to your doctor. Your doctor will discuss important findings and next steps with you.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Learn more about how to prepare for this painless diagnostic test that creates detailed pictures of the inside of the body without using radiation.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","tags":[1687,1682],"class_list":["post-52874","mayo","type-mayo","status-publish","hentry","tag-medical-procedure","tag-person-group-concept","content_type-tests-procedures"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>MRI - Hancock Health<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.hancockhealth.org\/zh\/mayo-health-library\/mri\/\" \/>\n<meta property=\"og:locale\" content=\"zh_HK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MRI - 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