A radiation-free, soft-tissue-focused imaging method in which images obtained with a magnetic field and radio waves are enhanced with a gadolinium-containing contrast agent.
Indication
- Evaluation of brain tumors, demyelinating diseases (multiple sclerosis) and infections
- Characterization of liver, kidney, pancreas and soft-tissue masses
- Imaging of vascular structures (MR angiography)
- Identification of subtle joint and cartilage pathologies (arthrography)
- Breast cancer staging and breast MRI screening in high-risk patients
- Distinguishing recurrence from scar tissue after surgery or radiotherapy
- Evaluation of myocardial viability and cardiac tumors (cardiac MRI)
Preparation
- For abdominal MRI, 4-6 hours of fasting is usually requested; there is no special fasting requirement for other regions
- Kidney function (creatinine/eGFR) is evaluated beforehand; in patients with chronic kidney failure, the type of contrast and its necessity are reconsidered
- Any history of previous contrast reactions, allergies and asthma should be reported to the physician
- Pacemaker, cochlear implant, aneurysm clip, metallic implants and pregnancy status must always be checked
- All metal objects on the body, including tattoos, are evaluated for MRI safety
How it's performed
- The patient is placed in the scanner wearing MRI-compatible clothing; an IV line is opened in the arm or wrist
- Anatomical images are first acquired in non-contrast series
- At the determined time, the gadolinium-based contrast agent is administered through the IV line
- Additional image series are obtained in dynamic and delayed phases after contrast
- Headphones are used during the procedure to protect against the loud machine noise; in case of panic, communication is possible through a button
- Total duration is between 30-60 minutes depending on the region examined
Post-procedure
- After the procedure, the IV line is removed and the patient may be observed for half an hour
- Fluid intake is increased to support kidney excretion of gadolinium
- Observation for one day is recommended for delayed allergic reaction signs (rash, itching)
- Images are reported by the radiologist on the digital system and shared with the referring physician
Risks
- Gadolinium-based contrast agents are used carefully in advanced kidney failure due to the risk of nephrogenic systemic fibrosis (NSF); they are either avoided or low-risk macrocyclic agents are preferred
- Mild-to-moderate allergic reactions (nausea, itching, rash) may rarely occur; severe anaphylactic reaction is rare
- Claustrophobia may make the procedure difficult for some patients; open MRI or mild sedation may be considered if needed
- Pacemakers, intracorporeal metallic implants and some old stents may be incompatible with MRI; this must be checked beforehand
- Gadolinium accumulation in brain tissue with repeated contrast-enhanced MRIs is a debated issue; unnecessary repetitions are avoided
FAQ
Is the agent used in contrast-enhanced MRI the same as the X-ray contrast?
No. Gadolinium-based contrast is used in MRI, while iodine-based contrast is used in CT and X-ray. Their mechanisms of action, allergy risks and effects on the kidneys differ.
I have kidney disease — can I have a contrast-enhanced MRI?
In mild-to-moderate kidney impairment, the decision is made carefully, and in advanced kidney failure, the risk-benefit balance is weighed. Due to the NSF risk, macrocyclic agents are preferred or unenhanced MRI is performed in relevant cases.
Can contrast-enhanced MRI be performed during pregnancy?
Gadolinium contrast is used in pregnancy only for compelling indications and with physician approval; unenhanced MRI is considered as the first option.
Is it difficult to remain still during the procedure?
Yes, remaining still is necessary for image quality. Headphones and an internal communication button are provided; additional measures can be taken for claustrophobic patients.
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