High-speed camera helps heart researchers

FEBRUARY 16, 2010--Scientists funded by the UK BBSRC and the British Heart Foundation have developed a new way of capturing a high-resolution still image alongside very high-speed video.

FEBRUARY 16, 2010--Scientists funded by the UK Biotechnology and Biological Sciences Research Council (BBSRC) and the British Heart Foundation bhf.org.uk at the University of Oxford have developed a new way of capturing a high-resolution still image alongside very high-speed video--a technology that is attractive for science, industry, and consumer sectors.

By combining off-the-shelf technologies found in standard cameras and digital movie projectors they have successfully created a tool that will transform many forms of detailed scientific imaging and could provide access to high-speed video with high-resolution still images from the same camera at a price suitable for the consumer market. This could have everyday applications for everything from CCTV to sports photography and is already attracting interest from the scientific imaging sector where the ability to capture very high quality still images that correspond exactly to very high-speed video is extremely desirable and currently very expensive to achieve.

The technology has been patented by Isis Innovation, the University of Oxford’s technology transfer office, which provided seed funding for this development and welcomes contact from industry partners to take the technology to market. The research is published in the 14 February 2010 issue of Nature Methods.

Peter Kohl and his team study the human heart using imaging and computer technologies. They have previously created an animated model of the heart, which allows one to view the heart from all angles and look at all layers of the organ, from the largest structures right down to the cellular level. They do this by combining many different types of information about heart structure and function using computers and advanced optical imaging tools. This requires a combination of speed and detail, which has been difficult to achieve using current photographic techniques.

Kohl said: “Anyone who has ever tried to take photographs or video of a high-speed scene, like football or motor racing, even with a fairly decent digital SLR, will know that it’s very difficult to get a sharp image because the movement causes blurring. We have the same problem in science, where we may miss really vital information like very rapid changes in intensity of light from fluorescent molecules that tell us about what is happening inside a cell. Having a 10 or 12 Mpixel sensor, as many cameras now do, does absolutely nothing to improve this situation.

Team member Gil Bub said “What’s new is that the picture and video are captured at the same time on the same sensor. This is done by allowing the camera’s pixels to act as if they were part of tens, or even hundreds of individual cameras taking pictures in rapid succession during a single normal exposure. The trick is that the pattern of pixel exposures keeps the high resolution content of the overall image, which can then be used as-is, to form a regular high-res picture, or be decoded into a high-speed movie.”

The technique works by dividing all the camera’s pixels into groups that are then allowed to take their part of the bigger picture in well-controlled succession, very quickly, and during the time required to take a single snapshot. So for example, if you use 16 pixel patterns and sequentially expose each of them for one sixteenth of the time the main camera shutter remains open, there would be 16 time points at which evenly distributed parts of the image will be captured by the different pixel groups. You then have two choices: either you view all 16 groups together as your usual high-resolution still image, or you play the sixteen sub-images one after the other, to generate a high-speed movie.

This concept has attracted the attention of Cairn Research, a UK-based scientific instrument manufacturer. “High speed imaging of biologically important processes is critical for many of our customers at Cairn Research,” said Martyn Reynolds, “Frequently there is a requirement to record events in living cells that are over in a fraction of a second, and this pushes us to the limits of existing technology. For several years we have been developing a product line for fast imaging of optical slices though cells, and we are very interested in using the processes and technology developed by the group in Oxford to extend the capabilities of our devices and the scientific benefits this could bring.”

The research may soon move from the optical bench to a consumer-friendly package. Mark Pitter from the University of Nottingham is planning to compress the technology into an all-in-one sensor that could be put inside normal cameras. Pitter said: “The use of a custom-built solid state sensor will allow us to design compact and simple cameras, microscopes, and other optical devices that further reduce the cost and effort needed for this exciting technique. This will make it useful for a far wider range of applications, such as consumer cameras, security systems, or manufacturing control."

Image credit: Gil Bub, University of Oxford.

Posted by Conard Holton, cholton@pennwell.com

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