The films, in words
The Advisor
Three systems. Thousands of pages. One decision your committee has to defend. Or ask the Eye of Horus Advisor. It answers only from the Eye of Horus library: more than four thousand seven hundred cited values, and fifteen hundred clinical images. Start with CT. Choose Compare, and name three systems. Ask for the specifications that matter to you. Seconds later, one table: coverage, rotation time, resolution, power and spectral imaging… every value with its source. Then the clinical features: what each system offers for cardiac and spectral work, side by side. And the clinical images, system by system, as each manufacturer published them. One step more, and the technical offer is ready, in PDF and Word, every value still carrying its source. Now MRI. Three systems, all at three tesla. Field strength, bore, gradients, magnet weight and helium… compared in a single table. The neuro and musculoskeletal features and options, documented for each system. The clinical images, ready for the radiologists on the committee. Add your requirements, and the tender is prepared: your requirements first, then every system, with a column for each bidder's answer. For tender committees, consultants and radiologists, who must defend every choice they make. Eye of Horus. Ask the library, not the internet.
The Site Planner
An MRI room is a physics problem. Choose the system, and bring the site drawing. Mark the scan room, the operator area and the equipment room. Upload the inspection form. Ceilings, power, cooling and the delivery route fill in on their own. The planner places the magnet, draws the five gauss line and the quench route, and compares the proposals… every check in plain view. Then the coordinated drawing set: twelve sheets, from the room plan to the magnetic fields and the mechanical services. For hospital project teams, planners and contractors. Plan the room before the scanner arrives.
Quotations
A quotation is only as good as the person who answers it. Ask the manufacturer for a quotation, in one place. Choose the modality, the manufacturer and the exact system. Your budget can stay undisclosed. Describe what the quotation should cover, and send it once. It reaches the verified sales team of that manufacturer in your region. They see the request… not who you are. The first to accept reads your details and answers, with the validity and the offer document. Only you see the answer. For hospital buyers, and for the sales teams who serve them. One request. The right sales team.
Closed MRI course
Hello, and welcome. I'm Attia, and today we meet the heart of the closed MRI: the superconducting magnet. And everything around it. Fifteen modules, sixty-two films, just over seven hours. We start with a map: energy, signal, control and heat. Four paths that depend on each other. Then the physics of the image: how position becomes frequency, and why a sharp picture can still be wrong. Inside the cold, at about minus 269 degrees Celsius: why power off is not field off. We follow the heat to the chiller, open the gradient assembly, and watch the RF coils send, then listen. Then the electronics: one shared clock, gradient amplifiers chasing their command, and raw data that shows what an image hides. The table, the cooling logic and the RF room, all opened in 3D. Every module ends with a service call. The hospital is made up; the reasoning is real. And you leave with one method: observe, suspect, calculate, check, verify. Built for MRI and biomedical service engineers: the reasoning, never a procedure. Eye of Horus, Biomedical Intelligence. Special discount for the first 200 users.
CT course
Hello, and welcome! I'm Attia, and I'll be your trainer for the CT course. I'm a biomedical engineer who loves radiology. Honestly, I still get a little excited every time I walk into a CT room. A CT scanner is three boxes and three paths: power, control and data. Learn to read all three, and find faults with evidence. Follow the energy to the focal spot, and read the waveform before replacing a part. See why a ring in the image can point to one detector channel. Watch data cross a gap that never stops turning, and count every view. Time the data to the archive, and prove the table's true position. Step outside the scanner, to the building's supply, earth, floor and air. Work behind the covers belongs to authorised engineers, and the course shows why. Every chapter ends with a service call. The last one ties all nine together. Nine modules, thirty-seven films, four hours, for CT service engineers working on electronics and hardware. Eye of Horus, Biomedical Intelligence. Special discount for the first 200 users.
Open MRI course
This course is about a rare machine. Our reference open MRI is the only open superconducting MRI in service today, and the only one at high field. Twelve modules. Forty-eight films. Over five hours inside one machine. First, the shape: two poles, two pillars, and a field from the floor to the ceiling. Then the cold: coils in liquid helium at about 4.2 kelvin, and a cold head that gives it back. How current enters a superconducting coil, why it keeps flowing, and what really happens in a quench. The iron that shapes the field, and the bolts that make it even. Flat gradient coils, eddy currents, and the vibration peak you leave alone. A radio field that lies flat, an echo of a hundred microvolts, and a room that keeps the world out. The patient table, the site, and what the UPS protects. Image quality, adjusted in order. Then a final case that tests everything. Every module ends with a service call: a teaching case, solved with evidence. Magnet work stays with authorised engineers. Eye of Horus, Biomedical Intelligence. Special discount for the first 200 users.
Linear accelerator course
For the next twelve chapters, you're going to learn this machine from the inside: the medical linear accelerator. Hello, and welcome! I'm Attia, and I'll be your trainer for the linear accelerator course. Twelve chapters. Forty-eight films. Over five hours inside one machine. First, the map: one point in space, three rooms, and four paths that depend on each other. Then safety: a beam that only comes when it's called, and two switches on every door. Six states, every step earned, and interlock chains where every contact is a veto. The pulse: power collected slowly, then released in a few millionths of a second. Radio power from a magnetron, electrons from a hot wire, and a wave that carries them. Steering coils, bending magnets, and a spot that stays put. Inside the head: the target, the chamber that measures every dose, and the leaves that shape the beam. Then the gantry, the couch, the images that check the aim, and the room the machine depends on. Every chapter ends with a service call: a teaching case, solved with evidence. Work behind the covers belongs to authorised engineers. Eye of Horus, Biomedical Intelligence. Special discount for the first 200 users.
Questions buyers ask
Preparing a room for a new MRI scanner
How do we calculate the floor loading needed for a 1.5T or 3.0T MRI magnet?
Start from the manufacturer's site planning guide for the exact model: it gives the magnet's weight (usually several tonnes, heavier at 3T), its footprint and its point loads. A structural engineer then checks the slab under the magnet and along the whole delivery route. If the slab is not enough, the usual answers are a spreader plate, local reinforcement or a different room.
What are the rules for routing the quench pipe safely outdoors?
The manufacturer sets the pipe's diameter, maximum length and number of bends for each magnet. The outlet must vent upwards, well away from people, windows, doors and air intakes, with a marked exclusion zone below it. Local building and fire rules apply on top. Some sealed low-helium magnets need a much smaller vent or none at all, so check the exact model before designing the route.
How do we map the 5 gauss line so it stays out of public areas, lifts and pacemaker zones?
The 5 gauss (0.5 mT) line is drawn on the floor plan from the manufacturer's field plots, in three dimensions: it reaches the floors above and below too. Everything inside it must be a controlled area, with signs and access control, because pacemakers and other implants are at risk there. If the line reaches a public space, the magnet is moved or rotated, or magnetic steel shielding pulls the line back.
Copper or galvanised steel: which RF shielding do we need?
Both work. What matters is the attenuation the manufacturer asks for, typically around 100 dB across the system's frequency range (about 64 MHz at 1.5T, about 128 MHz at 3T). The RF cage is a complete system: panels, the RF door, the window, filters for every cable and waveguides for every pipe. It is tested after installation. RF shielding is not magnetic shielding; that is a separate job.
How much electrical power must reach the equipment room?
The model's site planning guide gives the figure. Expect a dedicated three-phase feeder, often around 100 kVA or more for the system, plus separate supplies for the chiller and the air conditioning. Plan the main switch, the emergency off buttons and, for the cold head compressor, a backed-up supply, because the magnet must stay cold through a power cut.
What temperature and humidity do the magnet and equipment rooms need?
Each manufacturer gives exact ranges. As a rule, the equipment room needs steady cooling for the cabinets' heat, with non-condensing humidity, and the scan room needs a comfortable temperature for the patient with controlled humidity. The air conditioning must keep running when the scanner is off, because the electronics and the cold head still produce heat.
What clearance does the delivery route need for rigging the magnet?
Take the magnet's shipping dimensions and weight from the manufacturer, then add room for the rigging equipment. Check every door, corridor, turn, ramp, lift and floor slab on the way. When the route is too small, the usual solution is a removable wall section or a temporary opening in the RF cage, planned before construction starts.
How do we test for RF noise, moving steel and floor vibration before installation?
A site survey measures three things. RF noise, from radio sources nearby. Changes in the magnetic field from moving steel, such as cars, lifts, trains and trams. And floor vibration. The manufacturer gives the limits for each. The results decide where the magnet can go, and whether extra shielding or vibration isolation is needed.
Comparing CT or MRI scanners before buying
Which specifications drive patient throughput, not just the brochure?
For CT: detector coverage, rotation time, table speed and how fast images reconstruct. For MRI: bore size, how quickly coils are set up, acceleration techniques, gradient performance and automated workflows. For both: uptime, service response and how easy the system is for the technologists. Compare these side by side for every candidate system, value by value.
How do gradient strength and slew rate affect MRI image quality and scan time?
Gradient amplitude (mT/m) and slew rate (T/m/s) set how fast the system can encode an image. Stronger gradients allow thinner slices, shorter echo times and faster diffusion and cardiac imaging, which matters most in neuro and cardiac work. The usable speed is limited by nerve stimulation in the patient, so the numbers should be compared together with the clinical protocols you plan to run.
For CT, how do tube heat capacity, rotation speed and iterative reconstruction affect low-dose imaging?
Tube heat capacity and cooling decide how many scans can run back to back without waiting. Generator power decides how much tube current is available at low kV, which is where low-dose and contrast-saving scans happen. Rotation time sets the temporal resolution for cardiac CT. Iterative and deep-learning reconstruction reduce image noise, so the same image quality needs less dose.
What is the real difference in total cost of ownership between 1.5T and 3.0T over ten years?
3T usually costs more to buy and to site: the magnet is heavier, the fringe field is larger and the power demand is higher. Over ten years, the service contract is often the largest cost after the purchase, together with power, helium, upgrades and downtime. 1.5T remains the general workhorse and handles patients with implants more easily. 3T pays off when neuro, musculoskeletal or research work needs it.
How do coil design and channel count affect signal-to-noise and patient comfort?
More receive channels and well-designed coil elements raise the signal-to-noise ratio and allow faster parallel imaging. Lightweight, flexible coils speed up positioning and are more comfortable for the patient. Compare the coil list anatomy by anatomy, and check which coils are standard and which are optional for each system.
Which software and AI reconstruction tools should be in the base quote and which are add-ons?
Start from your clinical needs, then ask every vendor which packages are standard and which are optional, priced line by line. Typical items to check are deep-learning reconstruction, cardiac and neuro packages, contrast-free angiography and advanced post-processing. A side-by-side table of standard and optional features for each candidate system prevents surprises after signing.
Closed bore or wide bore: how do image quality and claustrophobia compare?
A 70 cm wide bore helps larger and claustrophobic patients and reduces scans that have to be abandoned. On some designs the wider bore comes with lower gradient performance or a smaller usable field of view, so compare the specifications rather than the bore alone. For most hospitals, wide bore is now the default for general MRI.
Which DICOM, PACS and cybersecurity standards must we check before choosing a vendor?
Ask for each system's DICOM conformance statement and the IHE profiles it supports, and check the worklist and PACS connection with your IT team. For cybersecurity, ask for the manufacturer's security documentation (such as the MDS2 form), how long the operating system will receive security updates, and how remote service connects to your network.
Writing a CT or MRI tender specification
How should we weight technical and commercial scores so the cheapest offer doesn't win by default?
First set pass or fail minimum requirements, then score only the offers that pass. Give clear weight to clinical and technical quality, and score the cost over the system's life, not only the purchase price: service, power, upgrades and uptime guarantees. Publish the scoring method in the tender so every bidder answers the same questions.
How do we write performance-based specifications without making the tender single-source?
Describe the clinical capability you need and the minimum values, not a product. Then check each requirement against several manufacturers' systems: if only one system can meet it, the requirement is too narrow. Avoid trade names, and ask every bidder to answer each requirement with its value and a reference. Eye of Horus prepares tenders this way: your requirements first, then every candidate system, with a column for each bidder's answer.
Which safety and regulatory standards must the tender list?
The general standard IEC 60601-1, the electromagnetic compatibility standard IEC 60601-1-2, and the particular standards: IEC 60601-2-33 for MRI and IEC 60601-2-44 for CT. Add the market approval that applies in your country, such as CE marking under the EU MDR, UKCA or FDA clearance, plus DICOM conformance and the national radiation protection rules for CT.
How should we define warranty, service levels, uptime and response times?
Start the warranty at acceptance, not at delivery. Define an uptime guarantee with a clear way to measure it, and a remedy when it is missed, such as a warranty extension. Set response and repair times, parts availability, remote service, preventive maintenance visits, and how many years the manufacturer will support the system and its software.
Which site works are the vendor's job and which are the hospital's?
Put a responsibility matrix in the tender. List every task: site survey, drawings, structural works, power, cooling, RF cage, quench pipe, rigging, installation, calibration and removal of the old system. Mark each one as the vendor's, the hospital's or shared. Most disputes come from tasks nobody wrote down.
How do we specify training in the contract?
Write the number of on-site application training days for technologists, a follow-up visit after go-live, support for the physicist's acceptance tests, and service training for the hospital's engineers, with the level of each. Require manuals and training material in the language your staff use.
Which penalty clauses should cover late delivery, installation or failed acceptance?
Tie payments to milestones: delivery, installation and acceptance. Set liquidated damages per week of delay, as a percentage of the contract value with a cap, and state what happens if the system fails acceptance: repair, replacement or termination. Keep the clauses proportionate, or good bidders price the risk into their offers.
Which documents and acceptance tests must vendors provide?
The installation and acceptance test records, image quality and safety test results (for CT, dose measurements; for MRI, phantom and RF cage tests), operator and service documentation, the DICOM conformance statement, certificates of conformity, and the list of delivered hardware and software options to check against the order.
Low-helium and sealed MRI magnets
How do low-helium and sealed magnets work, and how much helium do they need?
A conventional superconducting magnet sits in a bath of about 1,500 to 2,000 litres of liquid helium. Low-helium designs keep the coils cold with only a few litres up to a few tens of litres, sealed at the factory and cooled by a cryocooler. In normal use they need no helium refills.
Do sealed magnets remove the need for a quench pipe?
For some designs, yes: the small helium volume lets them work without an external quench pipe. Others still need one, usually smaller. Check the exact model's site planning guide; it can save a large part of the building work, especially in existing hospitals and upper floors.
What is the financial impact on service contracts and helium budgets?
Helium refills and the risk of expensive helium deliveries after a quench largely disappear, and siting can be simpler and cheaper without a quench pipe. The service contract still covers the cold head, the compressor and the electronics, so compare the full service offer, not only the helium savings.
Are there compromises in homogeneity, gradients or image quality?
Compare a sealed system like any other: field homogeneity, gradient performance, bore and coils, specification by specification. Today most sealed magnets are 1.5T and lower field systems, so for 3T work a conventional magnet is still the usual choice.
How do low-helium magnets handle a quench or a power cut?
With little helium, the magnet depends more on its cryocooler: in a long power cut it warms up sooner than a conventional magnet, so a backed-up supply for the compressor matters. After a quench, many sealed designs can be cooled and ramped again on site without a large helium delivery, which shortens downtime.
What support does a cryogen service intervention need?
Cryogenic work on any superconducting magnet belongs to the manufacturer's authorised engineers. Sealed magnets need such interventions much less often, and without the large helium deliveries that conventional magnets need.
Which manufacturers offer low-helium or sealed platforms?
The major MRI manufacturers each offer their own design: for example Philips BlueSeal, Siemens Healthineers DryCool and GE HealthCare Freelium, and other makers have their own. Compare their models on the same specifications, and ask each one how many systems are in clinical use.
How do insurers and safety rules treat low-helium magnets?
Far less cryogen means far less risk of oxygen depletion in the room and around the vent, which simplifies the safety case. The usual MRI safety rules still apply: controlled access, oxygen monitoring where your rules require it, and the 5 gauss zone. Requirements differ by country, so confirm with your local authority and insurer.
Training for CT, MRI and linear accelerator service engineers
Which certifications do engineers need before servicing advanced imaging systems?
Manufacturers train and authorise engineers model by model, usually on top of an electronics or biomedical engineering background. Access to the service software and documentation is usually tied to that authorisation. Work behind the covers belongs to authorised engineers.
What is the difference between service training levels?
Each manufacturer uses its own levels. In general, the first level covers safe operation, user maintenance and first-line fault finding, and higher levels add part replacement, calibration and system-level repair. What your in-house team may do depends on the level reached and your service contract.
How do engineers get hands-on training on CT generators or linac RF systems?
Hands-on training usually happens at the manufacturer's training centres, so include training places in the purchase contract. Understanding the machine first makes that time far more useful: Eye of Horus courses show every part in 3D and teach the reasoning behind each fault, before the engineer meets the real hardware.
What continuing training keeps engineers current?
Training for each new software version and each new model, refresher courses at the interval the manufacturer sets, and regular safety refreshers. Keep a training record per engineer and per system.
How do third-party training programmes compare with manufacturer courses?
Manufacturer courses give access to the service tools and the authorisation. Independent courses can cover more systems, more of the physics and the reasoning, at lower cost. They complement each other: an independent course prepares the engineer, and the manufacturer's course authorises the work.
Which safety training is mandatory?
It depends on the country, but usually: electrical safety for high voltage, radiation protection for CT and linear accelerators, and MRI safety for anyone entering the magnet room, because the magnetic field is always on. Hospitals often add their own local rules.
How can a hospital validate an engineer's competency before unsupervised repairs?
Use supervised work with a documented sign-off for each system and each task, keep the training certificates on file, and review competency regularly as part of the hospital's medical equipment management programme.
What remote support and escalation paths are taught in advanced service training?
Engineers learn to collect evidence before they escalate: error logs, test results and measurements. Then they use the escalation path from the local engineer to the manufacturer's remote specialists and the factory support team, often through a secure remote connection to the system.
