Ultracheap Ultrasound for Hospitals in Poor Areas

Ultracheap Ultrasound for Hospitals in Poor Areas

An ultra-low cost scanner that can be plugged into any computer to show images of an unborn baby has been developed by Newcastle University engineers.

The hand-held USB device – which is roughly the size of a computer mouse – works in a similar way to existing ultrasound scanners, using pulses of high frequency sound to build up a picture of the unborn child on the computer screen.

However, unlike the technology used in most hospitals across the UK costing anywhere from £20,000-£100,000, the scanner created by Jeff Neasham and Research Associate Dave Graham at Newcastle University can be manufactured for as little as £30-40.

Tested by experts in the Regional Medical Physics Department at the Freeman Hospital, part of the Newcastle upon Tyne Hospitals NHS Foundation Trust, the scanner produces an output power that is 10-100 times lower than conventional hospital ultrasounds.

It is now hoped the device will be used to provide medical teams working in the world’s poorest nations with basic, antenatal information that could save the lives of hundreds of thousands of women and children.

“Here in the UK we take these routine, but potentially lifesaving, tests for granted,” explains Mr Neasham, a sonar expert based in the University’s School of Electrical and Electronic Engineering.

“Imaging to obtain even the simplest information such as the child’s position in the womb or how it is developing is simply not available to women in many parts of the world.

“We hope the very low cost of this device and the fact that it can run on any standard computer made in the last 10 years means basic antenatal imaging could finally be made available to all women.”

Mr Neasham said the original aim had been to make something portable and easy to use that would be affordable in developing countries as well as for some applications in the UK where ultrasound is still considered cost prohibitive.

“Cost was the key,” he explains. “The goal was to produce a device that could be produced for a similar cost to the hand-held Doppler devices (foetal heart monitors) used by most community midwives. Not an easy task when you consider a £20,000 scanner is generally classed as low cost.”

An expert in underwater sonar technology, Mr Neasham has developed systems for imaging the seabed – looking for ship wrecks or specific geographical features – as well as underwater communications and tracking systems.

Drawing on his expertise in sonar signal processing, the design keeps components and hardware costs to an absolute minimum, and works by manually sweeping a transducer over the skin while a focussed image is formed by the PC software.

Funded through an Engineering and Physical Sciences Research Council (EPSRC) Knowledge Transfer Account (KTA) and a Proof of Concept loan from NorthStar Ventures, the scanner requires nothing more than a computer with a USB port in order to work. Mr Neasham said the beauty of this device was that it would complement – rather than replace – the high performance scanners available in hospitals.

“It was my own experience of becoming a father and going through the whole antenatal process that prompted me to start the project,” explains the father-of-two.

“I was sat with my wife looking at our child on the screen, we realised how privileged we were to have access to this kind of care and it was my wife who suggested that I could apply my knowledge from sonar research to try to make this more affordable.”

UN statistics estimate more than 250,000 women die annually from complications during pregnancy or childbirth, almost all of them – 99 per cent – in developing countries. Tragically, most of these deaths are avoidable and a lack of access to equipment is cited as one of the key factors.

Mr Neasham adds: “There is obviously the potential to use it to go beyond obstetrics by using it to diagnose conditions such as gallstones, or other conditions that readily show up with ultrasound imaging. Even vets and farmers are interested in affordable imaging.

The Problem: researchers at Newcastle University have been working on developing a medical ultrasound scanning device, drawing upon many years of innovation in sonar signal processing. Current ‘top-end’ ultrasound devices have a price range of £20,000-£200,000, whilst the ‘low-end’ devices are priced around £5,000. Our market research has identified a growing need and market for ‘low-end’ handheld devices. The aim of this work has been to create a product which could be marketed at a lower price level than current handheld devices and hence enable the use of ultrasound imaging in applications or regions of the world where it is currently cost prohibitive.

Ultrasound DeviceThe Solution: in order to achieve the target price, the device needs to have a low manufacturing cost which places constraints on the component costs. Hence the design philosophy has been to use the minimum possible hardware in the scanning head and connect to any available PC (via USB) to perform signal/image processing and display. Furthermore, the construction of multichannel phased array transducers would far exceed the target cost and so a single transducer element is used. To minimise the cost of electronic circuitry and produce high resolution images from a single fixed focus transducer, several innovative sonar signal processes have been applied. Echo data is gathered as the transducer is manually scanned back and forth across the skin and the PC then performs the focusing and other operations to generate an image up to 3 times per second. In the current prototype the ultrasound frequency and scan dimensions have been chosen to match that of convex array scanners typically used for obstetrics and general abdominal imaging but the parameters could be adapted to suit other applications.

The Opportunity: below we see the comparison of images from high end phased array scanners costing £50,000 – £100,000 (on the left) with similar images generated from the latest prototype for the low cost device (on the right). The first two images are from a 25 week fetal phantom with some anatomical features (such as skull and ventricles). The third image is from a contrast/resolution phantom with point targets (nylon wires) and circular regions of varying contrast in a background which simulates liver tissue. Images compare favourably even before any image post processing (non-linear contrast scaling or speckle filtering) has been applied and enhancements in signal-to-noise ratio, contrast etc are ongoing through improvements in circuitry, software and transducer construction.

The University is seeking collaborative and/or licence opportunities with a suitable industrial partner who can take the next steps of commercializing the technology.

In the modern industrial world, expecting parents have the choice of not only visualizing their child in the womb, but to have a 3D printout of the ultrasound scan to take home. Yet ultrasounds remain expensive enough that much of the world’s poor never see an ultrasound machine, let alone have one used on them to address a medical condition or to check up on a fetus.

Researchers at Newcastle University have been working on developing an ultrasound that can be manufactured significantly cheaper than existing devices. That starts with using an external computer as the display and interface for a USB powered probe, and the rest of the components can be produced for well under $100.

Source : http://www.ncl.ac.uk/business/commercialisation/transfer/biomedical-sciences/ultrasound.htm

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