What Mobile MRI Actually Provides

A mobile MRI provides scanning capacity on scheduled days, delivered in a unit owned and maintained by the supplier, with no capital outlay and no siting construction. What it does not provide is an asset, a guaranteed volume, or clinical infrastructure.

That distinction defines when the route makes sense. A provider gains access to a scanner without committing to a shielded room, cryogen management, or a service contract; in exchange, the cost per examination is higher, the schedule is shared with other sites, and nothing accrues on the balance sheet. The route is rational when the question being answered is whether demand exists rather than how much capacity to install, and it remains rational during the interval between deciding to build and being able to operate.

Cost Structures: Per Day, Per Scan, Per Contract

Mobile arrangements are priced in three different ways, and each transfers risk differently. Comparing them requires normalizing to a common unit, which is usually the cost per completed examination at the expected volume.

The choice between them follows from how confident the provider is about volume. Where the referral pathway is established but the scanner is not, per-scan pricing removes the risk of paying for an empty day. Where the volume is likely but not guaranteed, a committed contract lowers the unit cost and accepts some residual risk. The mistake to avoid is a day-rate contract taken on the assumption that the days will fill, because the cost of a partially used scanning day is the same as a full one.

Contract Terms That Decide the Real Cost

Contract terms matter more in mobile arrangements than in most equipment purchases, because the provider is buying access rather than an asset. The clauses below determine what the service actually costs across a year and what happens when the schedule changes.

• Reserved days or volume, and the notice required to change them without penalty.
• Measurement of a scanning day: hours on site, examinations included, or a defined end-to-end window.
• Which unit is supplied, and whether the same scanner returns on each visit.
• Who provides the technologist, and whether reporting and radiologist access are included.
• Set-up, travel, and call-out charges, and whether they are inside the rate or billed separately.
• Minimum volume or minimum days, and the consequences of falling below them.
• Uptime commitment, substitution arrangements if a unit fails, and the remedy for a missed visit.
• Extension and exit terms, including the price of terminating early if a fixed scanner goes live sooner than planned.

The uptime and substitution clauses carry the most operational weight, because a missed visit does not just cost the contract day; it delays patients who have already been scheduled. A contractual commitment to substitute a unit, and a defined remedy when that does not happen, is what converts the arrangement into something a clinic can safely build a referral pathway around.

Site, Power and Access Requirements

The unit arrives with its own building, but the site still has to receive it. Access and power requirements are modest compared with a fixed installation, yet they are frequently underestimated, and a site that cannot host the trailer loses the scanning day entirely.

• A parking or hardstanding position the unit can reach, with adequate width and turning space for the vehicle.
• Power supply at the capacity and configuration the unit requires, with any adapter arranged in advance.
• Patient access, including a covered or weather-protected transfer path and wheelchair or stretcher handling.
• Waiting and changing space near the unit, and reception arrangements for scheduled patients.
• Proximity restrictions: the unit’s magnetic field affects what may be stored or operated nearby.
• Site permission from the landlord or facilities team, including any restriction on vehicle presence.

Two of these cause recurring problems. Magnetic field restrictions mean the trailer’s position has to be agreed with whoever manages the adjacent space, including car parks, and power provision often requires an electrician visit that should be scheduled before the first scanning day rather than on it.

Service Quality and Image Quality Parity

Parity with a fixed scanner is a specification question rather than a category question. A mobile unit of comparable field strength, running a current software release, and fitted with an appropriate coil configuration delivers comparable images; a lower-specification unit may not, and the contract is where that is established.

• Field strength, bore, and software release of the unit scheduled to attend.
• Coil configuration available for the protocols the site intends to offer.
• Whether the same unit returns each visit, so protocol setup and sequence optimization persist.
• Technologist arrangements, and whether the site’s own staff operate or the supplier provides cover.
• Quality assurance records for the unit, including its routine testing regime and any alert history.

Two practical checks are worth making before the first paid day. Request the specification of the actual unit that will attend, in writing, rather than a category description. And agree a mechanism for reporting and resolving image quality issues, because a sequence that underperforms on a mobile unit is harder to troubleshoot informally than one on a site the provider controls. Independent alert reporting such as that published by ECRI is a reasonable check on the model’s safety history, and expectations for routine equipment testing are covered in practice guidance from professional bodies including AAMI.

The Threshold Where Fixed Beats Mobile

There is a volume at which a fixed scanner becomes cheaper, and it can be estimated rather than guessed. The comparison is between the annual cost of mobile access at projected volume and the annualized cost of a fixed system — capital, siting, service, cooling, and staffing — against the same volume.

• Annual mobile cost at projected volume, using the actual contract rate rather than a discounted headline.
• Annualized fixed cost: financing or depreciation, service, cryogen, power, and technical staffing.
• Siting cost amortized across the same period, since it is incurred once for the whole term.
• Throughput difference: examinations per day on a fixed scanner against a mobile visiting schedule.
• Revenue retained: referrals a fixed system keeps on site that a mobile schedule cannot accommodate.

The threshold usually arrives earlier than providers expect, because a mobile schedule carries an opportunity cost as well as a direct one: patients who cannot be scheduled on the visiting days may be referred elsewhere, and that referral may not return. The estimator should therefore include retained-volume effects rather than comparing direct costs alone. Where the fixed case is being built, the capital questions are the same as any imaging purchase, and the financing structures available for imaging equipment materially change the annualized figure.

Data You Need Before Choosing Mobile

The mobile decision is data-led, and the data are operational rather than financial. A provider that can state its referral volume, its waiting time, and its scheduling constraints can price a mobile contract against a fixed alternative; one that cannot will choose on the basis of cost per day, which is the least informative number available.

• Referral volume per month for the relevant examinations, and how much is currently sent elsewhere.
• Waiting time from referral to scan, and how it affects referral behavior.
• Examinations per scanning day required, and whether they suit the visiting schedule.
• Protocol mix, since it determines whether a lower-specification unit is adequate.
• Local reimbursement or funding position for the examinations concerned.
• Site constraints that would delay a fixed installation, and any planned building work.

Collecting this before requesting mobile quotations also improves the quotation itself. Suppliers price against volume commitment and predictability, so a provider that can evidence a referral pathway receives a different rate from one exploring a possibility.

Transitioning From Mobile to Fixed

Mobile capacity usually ends in one of two ways: it is scaled back when a fixed scanner arrives, or it continues on a reduced schedule to cover overflow and specific protocols. Planning the transition at the point the mobile contract is signed avoids the trap of a fixed system arriving while a mobile commitment still requires payment.

• Notice periods and minimum commitments in the mobile contract, and their cost if demand shifts earlier than expected.
• Whether the fixed installation can be phased so that scanning continues during construction.
• Protocol and workflow continuity, so referring clinicians see no change in what is offered.
• Staffing continuity, including any technologist arrangements that were provided under the mobile contract.
• The fixed system’s configuration, informed by the protocol mix the mobile service actually delivered.

The last point is the most valuable output of a mobile period. Operating a mobile service produces real data on the examination mix, the referral sources, and the scheduling constraints that a business case prepared before any scanning cannot match. Where the fixed system is then specified, it should be specified against that evidence, and where an existing unit is being replaced or traded against the purchase, its value should be established before the replacement specification is fixed so that the credit remains visible in the comparison.

Before committing to a mobile contract or a fixed purchase, verify:

• The unit that will attend, in writing, with its field strength, software release, and coil configuration.
• The rate structure, what a scanning day includes, and which charges sit outside it.
• Minimum commitments, notice periods, and the cost of varying the schedule.
• Technologist provision, reporting arrangements, and who holds clinical governance.
• Uptime commitment, substitution arrangements, and the remedy for a missed visit.
• Site readiness: access, power, patient transfer, and magnetic field restrictions.
• The regulatory basis for the unit and the labeling under which it will be operated, checked against the FDA medical device portal for US sites.
• The projected volume and the point at which a fixed system becomes the lower-cost route.

Mobile imaging is best understood as demand evidence bought at an operating cost, and it is the right choice while volume, siting, or timing remain unresolved. Practice guidance on imaging services, including material published by the American College of Radiology and technical literature reviewed by the Radiological Society of North America, informs the clinical side of that decision. Where the mobile period is intended to lead into a fixed installation, the transition is best planned alongside the capital case, and the commercial structures for that purchase can be compared under financing and leasing. The sequencing and verification steps that apply to either route are set out under device sourcing and buying process, with the specification and comparison stages covered under aesthetic device buying, before a quotation request is raised.

Questions About Mobile Imaging