Thursday, 26 February 2015
Bright light could speed up cancer diagnosis
A newly discovered mid-infrared (MIR) light from a special type of optical fibre will lead to new types of cancer diagnosis.
It could include rapid while-you-wait screening of skin on the body and assist in the removal of diseased tissue during surgery.
The finding has been achieved by scientists at The University of Nottingham in collaboration with DTU (Technical University of Denmark).
The Mid-Infrared Photonics team at Nottingham is led by Professor Angela Seddon, from the George Green Institute for Electromagnetics Research which is headed by Professor Trevor Benson at Nottingham.
The Nottingham team has achieved a world record by producing the widest recorded intensity of light ever produced by a mid-infrared optical fibre.
In a new paper published in Nature Photonics, Professor Seddon and Professor Benson show that the new portable fibre laser sends out a bright mid-infrared light rainbow beam covering the widest range of infrared light wavelengths to date for molecular detection of cancer without the need for biopsy sampling. The light is the so-called mid-infrared supercontinuum.
Most types of cancer have four stages. Stage one, the cancer is contained within the organ in which it started; stage two usually means the cancer hasn’t spread but the tumour is larger, stage three the cancer is usually larger and, in stage four the cancer has undergone metastatic spread (the transfer of cancer from one area of the body to another).
Professor Seddon said: “In the UK, recent figures have shown that about four out of ten patients are diagnosed with cancer in stages three or four. This late diagnosis impacts on treatment and five-year survival rates — meaning early detection is vital in order to increase survival rates.
“In our paper, we propose using MIR light for early cancer diagnosis using MIR medical imaging, sensing using endoscopy and examining the skin. This form of cancer screening is called an ‘optical biopsy’ and is both non-invasive and cost-effective and could determine the existence of cancer at a time when remedial action can be taken.”
While biomedical spectroscopy already distinguishes cancerous tissue from normal tissue using cut out biopsy samples, examination of patients without sampling has previously been prevented by the lack of portable, bright, broadband, mid-infrared photonic sources.
Thanks to this discovery, not only is there the potential for early screening of cancer but the technology will also impact on many sectors including the stand-off detection of explosives, process-control in agriculture, the oil industry, manufacturing and improved monitoring of the environment and energy efficiency.
The special fibre chemistry, design and its processing method were conceived by Professor Seddon. Fibre fabrication was led in the laboratory by Senior Research Officer Dr David Furniss with Drs Nabil Abdel-Moneim and Zhuoqi Tang in the Mid-Infrared Photonics team using a specialist fibre drawing tower.
The Mid-Infrared Photonics team is currently engaged in the development of the first mid-infrared fibre narrow-band laser. The achievement of this will lead to compact modular mid-infrared photonic sources — both narrow-band and wide-band. Narrow-band sources will lead to new options for fibre laser medical surgery and coherent mid-infrared photonic imaging of tissue.
The Nottingham team has been awarded 1m euros from the EU to carry out this research within the 7m euro MINERVA Project — MId-to NEaR infrared spectroscopy for improVed medical diAgnostics.Back