GRE阅读练习：全新医学技术高效诊断皮肤癌.docxVIP

Word文档下载后（可任意编辑） 第 第 PAGE 1 页 共 NUMPAGES 1 页 GRE阅读练习：全新医学技术高效诊断皮肤癌 GRE阅读训练：GRE阅读练习：全新医学技术高效诊断皮肤癌 GRE考试精品课程指导  DERMATOLOGISTS are good at spotting unusual bits of skin that might or might not be cancers.  皮肤病医学家擅长发现一小块异常皮肤是否有患癌症的可能性。  Testing whether they actually are, though, is quite literally a bloody pain.  但是，要检查出是否真患癌症的确会让人感到出血之痛。  For a piece of skin to be identified as malignant or benign it must be cut out and sent to a laboratory for examination under a microscope.  因为要鉴定一块皮肤是恶性还是良性，就必须剪下来，然后送到实验室的显微镜下检验。  But a team of researchers led by Rainer Leitgeb, a physicist at the Medical University of Vienna, hope to change that.  但是，由维也纳医科大学物理学家Rainer Leitgeb带领的研究小组希望改变这个现状。  As they describe in Biomedical Optics Express, Dr Leitgeb and his colleagues are exploring a technique called optical coherence tomography, which they think will allow skin cancer to be diagnosed in situ.  正如他们在《生物医学快报》上所描述的那样，Leitgeb博士和他的同事正在探寻光学相干断层成像术。在他们看来，使用这种技术能在原皮肤上进行皮肤癌诊断。  OCT is a form of optical echolocation. It works by sending infra-red light into tissues and analysing what bounces back.  OCT的原理是光学回声定位，先向身体组织发射红外线，  The behaviour of the reflected rays yields information on the structures that they collided with.  然后再分析反射回来的红外线。  That, Dr Leitgeb hoped, could be used to generate a map of features just beneath the surface of the skin.  Leitgeb博士希望，这能用来绘制显示皮肤表面下特征的地图。  Similar technology has been employed for nearly two decades by eye doctors and Dr Leitgeb felt that, with a bit of tinkering, it should work for skin as well.  相似的技术应用于眼科已有将近二十年的历史。Leitgeb博士认为，经过小小的改进，也能用于皮肤科。  The OCT systems operated by ophthalmologists use low-power lasers which produce light with a wavelength of 850 nanometres.  眼科医生操作的OCT系统使用的是低功率激光器，能够发出850纳米波长的光线，这刚好超出了眼睛视杆视锥层可感光的范围。  That is just beyond the range detectable by the rods and cones of the eye, and is thus ideal for probing that organ without discomf