Ultrasound
High-frequency sound waves imaged in real time. A cart-based system plus a family of transducer probes. No ionizing radiation. Shared-service systems run general radiology, OB / GYN, vascular, cardiac, MSK, breast, and pediatric applications from the same cart, swapping probes per exam type. Sonographer-driven exam — the operator makes interpretive scanning decisions in real time, distinct from the protocol-supervised model of CT / MRI.
Physics
Piezoelectric crystals in the transducer convert electrical pulses to acoustic waves; CMUT (capacitive micromachined ultrasonic transducer) silicon arrays do the same on chip. Waves reflect off tissue interfaces; echoes return to the transducer and are converted back to electrical signal. Time-of-flight gives depth; amplitude gives brightness in B-mode. Doppler modes measure velocity. Compound imaging averages beams steered at multiple angles to reduce speckle; harmonic imaging exploits non-linear tissue response for cleaner signal at depth.
History
- 1950s — early industrial ultrasound adapted for medical use.
- 1970s — gray-scale real-time 2D imaging.
- 1990s — digital beamforming, color Doppler ubiquitous.
- 2004 — iU22 ships with PureWave single-crystal transducers.
- 2010s — matrix arrays (xMATRIX) enable live 3D / 4D and TEE.
- 2018+ — CMUT semiconductor transducers (Butterfly iQ) introduce a fundamentally different cost / form-factor curve in the handheld segment.
- 2020s — AI-guided acquisition (Butterfly Blueprint, Caption Health, GE Auto-Tools) lowers the operator-skill floor for selected POCUS workflows.
Key specs
- Probe port count — typically 3–4 active on premium carts.
- Transducer platform — PureWave (Philips), xMATRIX (Philips), matrix-array imaging on Siemens / GE equivalents.
- Modes — 2D, M-mode, Color Doppler, pulsed-wave, continuous-wave, shear-wave / strain elastography, contrast-enhanced ultrasound (CEUS).
- Application packages — Cardiac / OB / Vascular / MSK / elastography / contrast — separable software entitlements.
- Probe family — curved, linear, phased, matrix, endocavity, TEE.
Systems
- Philips iU22 family, EPIQ 5 / 7 / Elite, EPIQ CVx
- Philips iE33 (cardiology)
- GE LOGIQ E9 / E10
- GE Vivid E9 / Vivid E95 (cardiology)
- Siemens ACUSON Sequoia / S2000 / SC2000
- Canon Aplio i / a series, Mindray Resona R9 / I9
- Butterfly iQ handheld
Clinical applications
- Abdominal Ultrasound
- OB / GYN ultrasound (biometry, fetal anatomy, gyne pathology)
- Vascular (carotid duplex, lower-extremity venous, renal artery)
- Cardiac (transthoracic echo, TEE, stress echo)
- MSK (rheumatology, sports medicine)
- Breast and small-parts (thyroid, scrotal, lymph node)
- Pediatric (hip dysplasia screening, abdomen)
Service and refurb reality
- Probes are the system. A fully-loaded iU22 probe set often exceeds the cart's refurb price. Probe damage is the #1 service event on any ultrasound platform.
- Probe refurbishment runs 60–80% cheaper than replacement and typically returns probes to factory spec.
- Software-license tier — premium application packages, advanced quantification (TOMTEC, AutoStrain, AI-assisted measurements), elastography, CEUS — are separable entitlements that materially shift refurb pricing.
- Ergonomics — height-adjustable control panel, monitor articulation, scan-arm reach. Sonographer musculoskeletal injury rates are among the highest in healthcare; ergonomics is a clinical-program retention issue, not a comfort feature.
- See Philips iU22 Field Guide.
Regulatory
- No ionizing radiation → no state radiation registration.
- ACR ultrasound accreditation for reimbursement of advanced / specialty indications.
- DICOM + HL7 integration with PACS / RIS / EMR.
- Probe disinfection per CDC and manufacturer guidance — high-level disinfection for endocavity / TEE; low-level for surface probes.