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<link rel="alternative" hreflang="en" href="https://medlineplus.gov/ency/article/003794.htm"/><meta property="og:title" content="Chest MRI: MedlinePlus Medical Encyclopedia"/><meta property="og:url" content="https://medlineplus.gov/ency/article/003794.htm"/><meta property="twitter:title" content="Chest MRI: MedlinePlus Medical Encyclopedia"/><meta name="twitter:card" content="summary_large_image"/><meta name="description" content="A chest MRI (magnetic resonance imaging) scan is an imaging test that uses powerful magnetic fields and radio waves to create pictures of the chest (thoracic area). It does not use radiation (x-rays)."/><meta itemprop="description" name="description" content="A chest MRI (magnetic resonance imaging) scan is an imaging test that uses powerful magnetic fields and radio waves to create pictures of the chest (thoracic area). It does not use radiation (x-rays)."/><meta property="og:description" content="A chest MRI (magnetic resonance imaging) scan is an imaging test that uses powerful magnetic fields and radio waves to create pictures of the chest (thoracic area). It does not use radiation (x-rays)."/><meta property="twitter:description" content="A chest MRI (magnetic resonance imaging) scan is an imaging test that uses powerful magnetic fields and radio waves to create pictures of the chest (thoracic area). It does not use radiation (x-rays)."/><meta property="og:image" content="https://medlineplus.gov/images/share_ency_1.jpg"/><meta property="og:image" content="https://medlineplus.gov/images/share_ency_2.jpg"/><meta property="og:image" content="https://medlineplus.gov/images/share_ency_3.jpg"/><meta property="twitter:image" content="https://medlineplus.gov/images/share_ency_1.jpg"/>
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</div><div><span>Chest MRI</span></div></div>
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</noscript></div><div class="main"><div id="ency_summary"><p>A chest MRI (magnetic resonance imaging) scan is an imaging test that uses powerful magnetic fields and radio waves to create pictures of the chest (thoracic area). It does not use radiation (x-rays).</p></div><section><div class="section"><div class="section-header"><div class="section-title"><h2>How the Test is Performed</h2></div><div class="section-button"><button type="submit" aria-controls="section-1" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-1"><p>The test is done in the following way:</p><ul><li>You may be asked to wear a hospital gown or clothing without metal fasteners (such as sweatpants and a t-shirt). Certain types of metal can cause blurry images or be dangerous to have on in the scanner room.</li><li>You lie on a narrow table, which slides into the large tunnel-shaped scanner.</li><li>You must be still during the exam, because movement causes blurred images. You may be told to hold your breath for short periods. </li></ul><p>Some exams require a special dye called contrast. The dye is usually given before the test through a vein (IV) in your hand or forearm. The dye helps the radiologist see certain areas more clearly. A blood test to measure your kidney function may be done before the test. This is to make sure your kidneys are healthy enough to filter the contrast.</p><p>During the MRI, the person who operates the machine will watch you from another room. The test most often lasts 30 to 60 minutes, but it may take longer.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>How to Prepare for the Test</h2></div><div class="section-button"><button type="submit" aria-controls="section-2" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-2"><p>You may be asked not to eat or drink anything for 4 to 6 hours before the scan.</p><p>Tell your provider if you are claustrophobic (afraid of closed spaces). You may be given a medicine to help you feel sleepy and less anxious. Your provider may suggest an "open" MRI, in which the machine is not as close to your body.</p><p>Before the test, tell your health care provider if you have:</p><ul><li><a test="test" href="./001414.htm">Brain aneurysm</a> clips</li><li>Artificial heart valves</li><li>Heart defibrillator or <a test="test" href="./007369.htm">pacemaker</a></li><li>Inner ear (cochlear) implants</li><li>Kidney disease or are on dialysis (you may not be able to receive contrast)</li><li>Recently placed artificial joints</li><li>Vascular <a test="test" href="./002303.htm">stents</a></li><li>Worked with sheet metal in the past (you may need tests to check for metal pieces in your eyes)</li></ul><p>The MRI contains strong magnets, so metal objects are not allowed into the room with the MRI scanner. This is because there is a risk that they will be drawn from your body toward the scanner. Examples of metal objects you will need to remove are:</p><ul><li>Pens, pocket knives, and eyeglasses</li><li>Items such as jewelry, watches, credit cards, and hearing aids</li><li>Pins, hairpins, and metal zippers</li><li>Removable dental work</li></ul><p>Some of the newer medical devices described above are MRI compatible, so the radiologist needs to check the device manufacturer to determine if an MRI is possible.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>How the Test will Feel</h2></div><div class="section-button"><button type="submit" aria-controls="section-3" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-3"><p>An MRI exam causes no pain. If you have trouble lying still or are very nervous, you may be given medicine to relax. Too much movement can blur MRI images and cause errors when the doctor looks at the images.</p><p>The table may be hard or cold, but you can ask for a blanket or pillow. The machine produces loud thumping and humming noises when turned on. You can wear ear plugs to help reduce the noise.</p><p>An intercom in the room allows you to speak to someone at any time. Some MRIs have televisions and special headphones that you can use to help the time pass.</p><p>There is no recovery time, unless you were given a medicine to relax. After an MRI scan, you can resume your normal diet, activity, and medicines.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Why the Test is Performed</h2></div><div class="section-button"><button type="submit" aria-controls="section-4" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-4"><p>A chest MRI provides detailed pictures of tissues within the chest area. In general, it is not as good at looking at the lungs as a <a test="test" href="./003788.htm">CT chest scan</a>, but it can be better for other tissues.</p><p>A chest MRI may be done to:</p><ul><li>Provide an alternative to <a test="test" href="./003327.htm">angiography</a>, or avoid repeated exposure to radiation</li><li>Clarify findings from earlier <a test="test" href="./003804.htm">x-rays</a> or CT scans</li><li>Diagnose abnormal growths in the chest</li><li>Evaluate blood flow</li><li>Show lymph nodes and blood vessels</li><li>Show the structures of the chest from many angles</li><li>See if cancer in the chest has spread to other areas of the body (this is called staging -- it helps guide future treatment and follow-up, and gives you an idea of what to expect in the future)</li><li>Detect tumors, especially in the middle part of the chest (mediastinum)</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Normal Results</h2></div><div class="section-button"><button type="submit" aria-controls="section-5" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-5"><p>A normal result means your chest area appears normal.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>What Abnormal Results Mean</h2></div><div class="section-button"><button type="submit" aria-controls="section-6" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-6"><p>An abnormal chest MRI may be due to:</p><ul><li>A <a test="test" href="./000181.htm">tear in the wall</a>, an <a test="test" href="./001119.htm">abnormal widening or ballooning</a>, or narrowing of the major artery carrying blood out of the heart (aorta)
</li><li>Other abnormal changes of the major blood vessels in the lungs or chest</li><li>Buildup of <a test="test" href="./000194.htm">blood or fluid around the heart</a> (pericardial effusion) or the <a test="test" href="./000086.htm">lungs</a> (pleural effusion)</li><li>Lung cancer or <a test="test" href="./000097.htm">cancer that has spread to the lungs</a> from elsewhere in the body</li><li>Cancer or tumors of the heart</li><li>
Cancer or tumors of the chest, such as a thymus tumor</li><li>Disease in which the heart muscle becomes weakened, stretched, or has another structural problem (<a test="test" href="./001105.htm">cardiomyopathy</a>)</li><li>Damage to, and widening of the large airways of the lungs (bronchiectasis)</li><li>Enlarged lymph nodes</li><li><a test="test" href="./001098.htm">Infection of the heart tissue or heart valve</a></li><li><a test="test" href="./000283.htm">Esophageal cancer</a></li><li>Lymphoma in the chest</li><li><a test="test" href="./001114.htm">Birth defects of the heart</a></li><li>Tumors, nodules, or cysts in the chest</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Risks</h2></div><div class="section-button"><button type="submit" aria-controls="section-7" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-7"><p>MRI uses no radiation. To date, no side effects from the magnetic fields and radio waves have been reported.</p><p>The most common type of contrast (dye) used is gadolinium. It is very safe. Allergic reactions to the substance rarely occur. However, gadolinium can be harmful to people with kidney problems who need dialysis. If you have kidney problems, tell your provider before the test.</p><p>The strong magnetic fields created during an MRI can cause heart pacemakers and other implants not to work as well. It can also cause a piece of metal inside your body to move or shift.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Considerations</h2></div><div class="section-button"><button type="submit" aria-controls="section-8" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-8"><p>Currently, MRI is not considered a valuable tool for spotting or monitoring slight changes in lung tissue. The lungs contain mostly air and are hard to image. CT scan tends to be better for monitoring these changes.</p><p>Disadvantages of MRI include:</p><ul><li>High cost</li><li>Long length of the scan</li><li>Sensitivity to movement </li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Alternative Names</h2></div><div class="section-button"><button type="submit" aria-controls="section-Alt" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Alt"><p>Nuclear magnetic resonance - chest; Magnetic resonance imaging - chest; NMR - chest; MRI of the thorax; Thoracic MRI</p></div></div></section><section><div class="section sec-mb"><div class="section-header"><div class="section-title"><h2>Patient Instructions</h2></div><div class="section-button"><button type="submit" aria-controls="section-carepnt" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div name="Patient Instructions" class="section-body" id="section-carepnt"><ul class="side-nav"><li><a href="../patientinstructions/000240.htm">Abdominal aortic aneurysm repair - open - discharge </a></li>
</ul></div></div></section><section><div class="section sec-mb"><div class="section-header"><div class="section-title"><h2>Images</h2></div><div class="section-button"><button type="submit" aria-controls="section-tnails" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div name="Images" class="section-body" id="section-tnails"><ul class="img-grid group">
<li><img src="//medlineplus.gov/ency/images/ency/tnails/23212t.jpg" alt="MRI scans" title="MRI scans" class="side-img"/><a href="../imagepages/1107.htm">MRI scans</a></li>
<li><img src="//medlineplus.gov/ency/images/ency/tnails/1774t.jpg" alt="Vertebra, thoracic (mid back)" title="Vertebra, thoracic (mid back)" class="side-img"/><a href="../imagepages/1774.htm">Vertebra, thoracic (mid back)</a></li>
<li><img src="//medlineplus.gov/ency/images/ency/tnails/8964t.jpg" alt="Thoracic organs" title="Thoracic organs" class="side-img"/><a href="../imagepages/8964.htm">Thoracic organs</a></li>
</ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>References</h2></div><div class="section-button"><button type="submit" aria-controls="section-Ref" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Ref"><p>Ackman JB. Thoracic magnetic resonance imaging: technique and approach to diagnosis. In: Shephard J-AO, ed. T<em>horacic Imaging: The Requisites</em>. 3rd ed. Philadelphia, PA: Elsevier; 2019:chap 3.</p><p>Jokerst CE, Gotway MB. Thoracic radiology: noninvasive diagnostic imaging. In: Broaddus VC, Ernst JD, King TE, et al, eds. <em>Murray and Nadel's Textbook of Respiratory Medicine</em>. 7th ed. Philadelphia, PA: Elsevier; 2022:chap 20.</p></div></div></section>
<section><div class="section"><div class="section-header"><div class="section-title"><h2>Review Date 7/31/2022</h2></div><div class="section-button"><button type="submit" aria-controls="section-version" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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