无痛激光设备可检测某些疾病的早期症状-凯发k8官网

portable devices with painless laser beams could soon replace x-rays as a non-invasive way to diagnose disease.

带有无痛激光束的便携设备可能将迅速取代x射线成为诊断疾病得力工具。

researchers say that the technique could become widely available in about five years.

the method, called raman spectroscopy（光谱学） , could help spot the early signs of breast cancer, tooth deca（蛀牙，龋齿） and osteoporosis（骨质疏松症） .

scientists believe that the technology would make the ¹ of illnesses faster, cheaper and more accurate.

raman spectroscopy is the measurement of the ² and ³ of ⁴ light from ⁵.

it is already being used in the chemical and ⁶ industries. for instance, raman lasers are used to measure flame characteristics. by studying how fuels burn, pollution from the products of ⁷（燃烧） can be minimised.

michael morris, a chemistry professor at the university of michigan, us, has been using raman for the past few years to study human bones.

so far, he has been working on ⁸, but he says that raman could prove effective in living patients.

"you can replace a lot of procedures, a lot of diagnostics that are out there right now. the big advantage is that it's non-invasive, pretty fast - much faster than classical procedures - and more accurate," he told bbc news.

when a person is sick, or about to become sick, the chemical mix in the tissue is quite different from that in healthy tissue, scientists say. so the raman ⁹ changes depending on the tissue it analyses, professor morris explained.

"raman gives you a ^{10 11}, a composition of whatever it is you're measuring," he said.

"in diseased states, the chemical composition is either slightly abnormal or very markedly（显著地） abnormal, depending upon the diseases."