What Are the Side Effects of an MRI with Contrast?

Cardiovascular system MRI (English name: Magnetic Resonance Imaging) is a surgical name that can obtain clear anatomy images of the large blood vessels of the heart and blood flow.

Cardiovascular system MRI

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Cardiovascular system MRI (English name: Magnetic Resonance Imaging) is a surgical name that can obtain clear anatomy images of the large blood vessels of the heart and blood flow.

Chinese name

Cardiovascular system MRI

Foreign name

Magnetic Resonance Imaging

Cardiovascular system MRI

Compared with CT, magnetic resonance imaging (MRI) has the following advantages: no X-rays, no radiation and side effects to the human body; high contrast of soft tissues, clear images; sensitive to the display of lesions, CT can be found Diseases that cannot be displayed; Can be scanned in any direction in multiple directions (such as transverse, coronal, sagittal, oblique, etc.); Multi-parameter imaging (T1WI, T2WI, proton density weighting and blood flow imaging); Not subject to Bone and gas effects will not cause artifacts; The blood flow in the heart's large blood vessel cavity has a flow effect, which does not generate or generate weak MR signals in the SE sequence; flows in the gradient echo sequence (GRE) The blood showed extremely high signal, while the rest of the soft tissue showed low signal (ie MRA). In this way, without the use of contrast agents, a clear anatomy image of the large blood vessels of the heart and blood flow can be obtained.

In recent years, MR imaging technology has developed rapidly. The advent of some new technologies has greatly improved the clinical application value of MR. FSE (fast spin echo), EPI (echo planar imaging), and FLASH (fast low-angle shot) Reduce imaging time to seconds or even milliseconds; Cine-GRE (gr

1. People with a pacemaker are prohibited from MR examination.

2. Patients with metallic silver clip after aneurysm.

3. Local metal foreign bodies.

4. Critical patients, those with severe cardiopulmonary insufficiency.

5. claustrophobic, unconscious, mentally ill.

1. Explain to the patient the role and significance of this test, and explain that the test is safe, without side effects, but takes a long time, and seek patient cooperation.

2. Remove all metal foreign objects (hairpins, necklaces, keys, earrings, false teeth, etc.) from your body.

3. Change inspection clothes.

1. Electrocardiogram gating technology The MR examination of the cardiovascular system should use electrocardiogram gating technology (ECG-gated MRI) to eliminate the image of cardiac motion on the imaging, and use the delay time after the R wave to select different cardiac motion cycles Period imaging. The method is to place button electrodes in the bilateral subclavian and apical regions, respectively, and connect the gating system to make the main wave upward (ie, the R wave is obvious).

2. Conventional axial cross-section scanning is the main method. Cardiac examinations should be performed in parallel or perpendicular to the long axis of the heart. Scans in other aspects should be selected according to the situation.

3. The application of special technology is to select MRA when observing the structure of large blood vessels and blood flow in the cavity, combined with film technology, to display dynamic effects, using R wave delay time, imaging in different phases of cardiac motion (such as Diastole, etc.), calculate heart function, etc.

The limitations and deficiencies of MRI include: slow imaging and longer examination time; insensitive to the display of calcification; poor display of small vascular lesions; cannot have MRI when there is a metal foreign body in the patient Inspection; Equipment is expensive and inspection costs are high.