Topic 03 · Equipment & capital · Deep dive
The hardware divide: who owns the machines, how old they are, what they cost
High-income countries field roughly forty CT scanners per million people; low- and middle-income countries field fewer than one. In nuclear imaging the gap widens to three orders of magnitude. Meanwhile the rich world's own fleets are ageing, and the top of the market has entered its biggest technology transition in a generation.
Density tracks wealth and payment systems far more than disease burden. Japan owns the densest CT fleet on earth and, notably, among the fewest radiologists per person to read its output.
Nuclear imaging cliff
SPECT: 17.9 vs 0.036 cameras per million (high- vs low-income) — a ~500× gap across the world's 25,000+ cameras, with 134 of 195 countries having any nuclear-medicine facility (IAEA, 2020). IAEA's IMAGINE database now counts ~27,000 systems across >140 countries.
Catch-up arithmetic
To reach high-income equipment levels, LMICs would need to add +11.4 CT and +5.2 MRI units per million people — thousands of installations, before staffing any of them.
The human cost
Scaling imaging up across LMICs would avert an estimated 2.46 million cancer deaths over 2020–2030 — 3.2% of cancer deaths, and 54.9M life-years — at a cost of $6.84bn. A modelled projection, and the Lancet Oncology Commission's headline case for closing the hardware gap.
The price ladder now spans two orders of magnitude within CT alone — and the refurbished market, at roughly half of new pricing, is how much of the world buys in.
The helium line-item
A conventional superconducting magnet holds roughly 1,000–2,000 L of liquid helium (~1,500 L typical). Refill pricing is volatile and contract-dependent — trade sources cite ~$32–35/L, with sharp spikes during the 2022 shortage. Philips puts the cost of a single quench at up to €100,000.
The helium exit
Philips has installed 2,000+ sealed BlueSeal 1.5T magnets since 2018 — saving a claimed 6 million litres of helium. Low-field 0.55T "High-V" systems attack the same dependency from below.
The detector revolution
Photon-counting CT — called by the FDA the biggest CT advance in a decade — has scanned 2M+ patients since 2021. Siemens is exiting conventional CT at the high end; GE, Canon and NeuSoft are entering the segment.
Machines follow money, not disease
Equipment density is the cleanest proxy for imaging capital, and it maps almost perfectly onto national income: roughly 40 CT scanners per million people in high-income countries against fewer than one across the low- and middle-income world, with the gradient steepening through MRI (a 3.6× spread even inside the rich world) to nuclear imaging, where the high-to-low-income ratio reaches three orders of magnitude. Nine African countries in fifty-four have a PET scanner of any kind. The Lancet Oncology Commission's arithmetic gives the gap its human denominator: about 2.46 million cancer deaths a year attributable to absent imaging.
Density is not capacity
Japan is the standing rebuttal to hardware-first thinking: the world's densest CT and MRI fleets alongside one of the OECD's thinnest radiologist workforces. Israel is the counter-example in the other direction — among the fewest MRI units per person in the OECD, worked at ~8,400 exams per unit per year, six times Greece's rate. The scanner count tells you what a system bought; the exams-per-scanner and reports-per-radiologist figures tell you what it actually delivers. Any equipment investment case that ignores the workforce page of this site is half a business case.
The refurbished market is global access infrastructure
With new CT at $350k–$2M and MRI projects starting around half a million dollars, the certified-refurbished channel — reliably about 50% below new — is not a niche: it is how large parts of the world acquire cross-sectional imaging at all. Ultrasound sits below the whole ladder at roughly a tenth of CT/MRI cost with trivial maintenance, which is why it anchors every serious LMIC access strategy. The WHO's 20-radiography-units-per-million benchmark is a reminder that for much of the world the capital question is still basic X-ray, not photon counting.
A generation change at the top
The top of the market is mid-transition on two axes at once. Detectors: photon-counting CT has gone from first install (2021) to 2M+ patients and a multi-vendor race, with the incumbent abandoning conventional technology in its high-end segment entirely. Cryogens: 2,000+ sealed helium-free magnets are already in the field, a direct response to the helium fragility documented in Topic 07. Both transitions will eventually cascade down the price ladder and into the refurbished market — the mechanism by which today's $5M flagship becomes the 2035 workhorse.
On the data. Scanner-density definitions differ across sources (installed vs operational; public-only in Canada's inventory; age-adjusted in the Fraser compilation) and years span 2016–2024. IAEA IMAGINE aggregates voluntary submissions of uneven quality. The nuclear-medicine density figures (SPECT 17.9 vs 0.036/M; PET 3.2 vs 0.007/M; 134 countries; 9 of 54 African countries with PET) come from Paez et al. via NUMDAB and describe the position around 2020; IAEA's IMAGINE database now reports roughly 27,000 SPECT systems across more than 140 countries, and 12 African countries offering PET/CT — so these ratios understate recent growth, though not the scale of the gap. All prices are indicative dealer/vendor ranges, not audited transactions, and vary widely with configuration and service terms. Helium refill pricing in particular is contract-dependent and swung sharply during the 2022 shortage; the quoted range is a trade estimate, not a spot price. Installed-base figures for photon-counting CT and BlueSeal are vendor-reported. The 2.46 million figure is a modelled projection of deaths averted by an imaging scale-up over 2020–2030 (Lancet Oncology Commission) — not a count of deaths currently attributable to lack of access.