MRI Scan: Claustrophobia, Gadolinium Contrast and Implants

Anxiety during an MRI is a common practical problem. A 2026 review reports that nearly 2 million scans a year are disrupted by anxiety, leading to early termination, image degradation from movement and higher costs. The authors describe strategies that improve tolerance: from technical solutions, through behavioural techniques, to pharmacological interventions. It is important that anxiety itself is not a sign of weakness — it results from the conditions of the scan: confined space, noise and inability to move.

The practical conclusion from this study is that 'equipment' (glasses, music) seems less important than human care — explaining how the scan will go, contact with staff, the possibility of stopping. This is a single trial in one centre, without a placebo group and without a comparison with no special care, so we do not know how much of the effect comes from individualised care and how much from other factors. The results should therefore be treated as a pointer, not as proof of a particular method.

The contrast used in MRI contains gadolinium bound in a molecule (a chelate) and is a completely different agent from the iodinated contrast used in CT. Its job is to alter tissue signal so that, for example, tumours, inflammatory lesions or vessels are better seen. Contrast is not given in every MRI — many scans (for example of the lumbar spine in someone without previous surgery, or of the knee) are done without it, and the decision lies with the referring doctor and the radiologist.

The safety concern has a specific origin: nephrogenic systemic fibrosis (NSF) — a rare, severe disease with fibrosis of the skin and organs, described in people with severe kidney failure after older contrast agents. For this reason requirements to check kidney function were introduced, and the use of older, less stable preparations was restricted. What the data say about newer agents is much calmer.

The conclusion has two sides. First, the NSF threat after newer agents is very rare. Second, the authors caution that data are sparse precisely in the most vulnerable groups: people with acute kidney injury and with severe chronic kidney disease. That is why information about kidney disease (see the entry on creatinine and eGFR) is one of the most important things a patient can pass on before a scan with contrast. Routine creatinine testing before every dose of newer contrast is not uniformly required — policy depends on the centre and the type of agent, and we do not describe regulations in force in Poland.

In 2014, brighter areas in the dentate nucleus and globus pallidus of the brain were described for the first time on unenhanced images in people who had previously had repeated gadolinium contrast, including with normal kidney function. This set off a wave of retrospective studies and patient concern. Ten years later the European society ESMRMB (its GREC committee) summarised the state of knowledge in a 2024 review.

In practice this means reasonable caution, not panic: contrast is given when there is a diagnostic reason (for example follow-up of a tumour, suspected inflammatory lesion), not 'just in case'. If someone has repeated MRIs with contrast, it is worth asking the doctor whether all the doses are necessary and what type of agent is used. Giving up contrast on your own may, however, reduce the value of the scan, so the decision should be made together with the doctor.

The magnetic field of an MRI scanner can move ferromagnetic objects, heat electrical leads and interfere with electronic devices. That is why staff ask about all implants before the scan. The manufacturer's labelling is key: an 'MR-conditional' device may be scanned under defined conditions (field strength, protocol, device programming). Older or unlabelled devices used to be treated as an absolute contraindication, but data from recent years are more nuanced.

This does not mean that every centre will scan a person with an old pacemaker. The results concern patients scanned according to a protocol, with a cardiologist or device technician involved and with monitoring and programming of the device before and after the scan. For the patient the conclusion is this: having a pacemaker is not an automatic ban, but the decision requires the implant's documentation and a procedure at the specific centre. For simple passive implants (for example most joint replacements, orthopaedic screws, stents) centres also rely on the manufacturer's information.

Tattoos are a source of concern because some pigments contain metal particles. In the population-based Rhineland Study (a German centre, 3 T) exclusion criteria were limited and people with passive implants, tattoos and permanent make-up were admitted — this allowed 16.6% more participants to be included, and no adverse events or artefacts were observed. On the other hand, a 2023 case report documents recurring stinging sensations in black tattoos in one woman just after the scan started, with analysis showing carbon black, not iron, as the pigment. The phenomenon is rare but known.

MRI uses no ionising radiation, so it is sometimes chosen where imaging is needed in pregnancy (for example suspected appendicitis or a lesion in the brain). The safety data come from a Canadian registry study whose results need careful interpretation.

The data are observational, the gadolinium group was small, and women scanned with contrast probably differed in health from the rest (the indication for the scan could have been a disease). This does not prove that contrast was the cause. The practical conclusion: in pregnancy gadolinium contrast is avoided unless essential, and the decision on a scan without contrast is made by the doctor after weighing alternatives. Breastfeeding should be discussed with the radiologist — recommendations may differ between societies, and we do not quote them without an opened source.

An MRI scan is one of the safest imaging tests in terms of radiation, but it asks the patient to pay attention in three places: anxiety, kidneys and metal in the body. All three can be addressed in advance, before entering the unit. The best investment is a conversation with the centre before the day of the scan and a complete list of implants, medicines and illnesses — it, rather than the newest scanner, most often determines whether the scan goes safely and gives a useful image.