Medical Imaging Cable

Medical imaging cables serve three distinct modalities — MRI, CT, and PET — each with unique engineering requirements that general-purpose medical cables cannot satisfy. MRI demands zero ferromagnetic content and RF heating prevention. CT demands millions of continuous torsional flex cycles. PET demands ultra-low-noise shielding exceeding 85 dB.

We manufacture specialized cable assemblies for all three modalities, drawing on the same micro coaxial element technology (42–44 AWG, ePTFE, silver-plated CuAg) used in our Ultrasound Probe Cable s but adapted with modality-specific materials, construction, and testing.

Product Range by Modality

MRI Cable — Material and Design Requirements

Every metal component must pass ASTM F2052 deflection angle test (< 45° at scanner entrance). Our MRI cable material selection:

Conductor: Copper or silver-plated copper. Titanium wire available for Applications requiring non-metallic-artifact imaging near the cable.

Shield braid: Silver-plated copper (zero steel content). We verify every braid lot for ferromagnetic contamination using a 0.5T permanent magnet screening test before cable production.

Shield foil: Aluminum-polyester laminate. No mu-metal or iron-based foil.

Connectors: Titanium Grade 2 or Grade 5 body. CuBe C17200 contacts with gold plating. Brass shells available as lower-cost alternative (non-ferromagnetic but higher artifact on imaging).

Fasteners: Titanium or polymer. No steel screws, clips, or springs anywhere in the assembly.

Segmented shield: Shield interrupted at λ/4 intervals to prevent RF-induced heating at Larmor frequency. Segment spacing: ~25 cm at 1.5T (64 MHz), ~8 cm at 3T (128 MHz). RF choke elements (ferrite beads or resonant traps) at each interruption maintain low-frequency shielding while blocking RF antenna behavior.

SAR testing: Per IEC 60601-2-33 Annex EE in tissue-equivalent phantom. Maximum local SAR at cable tip reported in W/kg.

CT Gantry Cable — Torsional Flex Design

CT gantry cables undergo continuous rotation at 0.27–0.5 seconds per revolution. Over a 10-year scanner life at 50–100 scans/day, total cycles reach 5–10 million.

Our counter-helical construction for CT achieves:
- > 5,000,000 torsional cycles at ±360° continuous rotation
- Impedance shift < 3% from initial over full cycle life
- Zero open circuits at end-of-life testing
- PUR jacket with UL94 V-0 flame rating

CT data cable: 42–44 AWG micro coaxial elements carrying multi-gigabit detector data from rotating gantry to stationary reconstruction computer.

CT power cable: 24–30 AWG power conductors carrying X-ray tube high-voltage supply (up to 150 kV) and detector bias voltages.

Both data and power cables use the same counter-helical cabling principle described in our Robotic Surgery Cable product page, adapted for the larger cross-section and higher cycle count of CT Applications .

PET Detector Cable — Ultra-Low-Noise Design

PET scintillation signals (< 1 mV amplitude, sub-nanosecond timing) require cable noise floor well below the signal level. Our PET detector cable achieves > 85 dB shielding effectiveness through:

Double braid construction: Inner foil (100% coverage) + first Ag-plated Cu braid (≥ 88%) + second Ag-plated Cu braid (≥ 85%). Combined shielding: > 85 dB at 100 MHz, > 70 dB at 1 GHz.

Phase matching for timing: Modern TOF-PET (Time-of-Flight) uses 200–400 ps coincidence timing windows. Cable propagation delay variation between detector channels must be controlled to < 50 ps to avoid timing jitter. We phase-match PET cables to ±0.5% propagation delay.

Low-microphonic construction: Mechanical vibration (from patient table movement, cooling fans) can induce electrical noise in cables through triboelectric effect. Our construction minimizes this through tight dielectric-to-shield contact and vibration-damping jacket material.

Frequently Asked Questions

Can one cable design work for both 1.5T and 3T MRI?

Not optimally. Shield segmentation spacing is frequency-specific (25 cm for 1.5T, 8 cm for 3T). A cable optimized for 3T will have excessive segmentation at 1.5T (unnecessary cost and complexity), while a 1.5T cable will have insufficient segmentation at 3T (SAR risk). Dual-tuned designs are possible as custom engineering projects.

What is the lead time for MRI-safe cables with titanium connectors?

4–8 weeks. Titanium connector machining requires 2–3 weeks; cable assembly and SAR testing add 2–5 weeks depending on test facility scheduling. We recommend starting the titanium connector procurement in parallel with cable prototype production.

Do you provide SAR testing or do we need to arrange it ourselves?

We coordinate SAR testing at accredited MRI safety testing laboratories as part of the cable development project. Test costs are quoted as a line item in the project proposal. Alternatively, we can provide untested cables for customers who prefer to conduct SAR testing at their own facility or through their own test laboratory.

How does CT cable cost compare to standard medical cable?

CT gantry cables cost approximately 3–5× more than equivalent-channel-count static medical cables due to counter-helical construction, torsional flex qualification testing, and PUR flame-rated jacketing. The premium is justified by the 5–10 million cycle life requirement.

Can PET cables be combined with CT cables in PET/CT systems?

Yes. PET/CT hybrid cables are a standard configuration for combined scanner architectures. The PET detector section uses double-braid shielding; the CT data section uses counter-helical torsional construction. An EMI barrier layer separates the two signal groups within the hybrid cable.

Designing cables for MRI, CT, or PET imaging equipment? Share modality, field strength / rotation spec, and channel count — we will propose the optimal material and construction.

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