Hand-Held Scanner Could Detect Tumours
It sounds too good to be true, but two independent studies appear to show that tumours can be detected by scanning people with a hand-held device similar to the metal detectors used to frisk airline passengers.

The development holds the prospect of a mass-screening technology that is cheap, quick and non-invasive.

The idea for the scanner came about after physicist Clarbruno Vedruccio, at the University of Bologna, Italy, designed a detector for non-metallic landmines and plastic explosives. It occurred to him that it might also be able to locate cancerous tissues in people. 

Called the Trimprobe---short for Tissue Resonance Interferometer---the device is a white plastic baton, inside which, an antenna produces a beam of microwaves that vary in frequency from 400 to 1350 megahertz.

To use it, the baton is simply swiped over the body---with no need for patients to undress. When the Trimprobe’s electromagnetic signal hits biological tissues, Vedruccio says they resonate at certain frequencies and produce a signal that interferes with the original incoming signal. The amount of interference is then detected by a receiving antenna in the probe.

Unlike MRI scanners, Vedruccio’s system does not produce an image of an organ. Instead, a computer displays a sequence of bands showing the amount of interference at different frequencies, with tumours generating strong interference at around 400 megahertz. In clinical trials, the scanner was able to predict prostate tumours in 93 per cent of cases that were later confirmed by biopsy.

Category:      Medical Technology
Source:         Adapted from: New Scientist, June 11, 2003
Words:         250

手提式扫描器可以探测肿瘤

此事听起来好得简直令人难以相信，然而两项独立的研究似乎表明，人们通过与搜查飞机乘客的金属探测器相类似的手提式装置对人体进行扫描，可以探测到肿瘤。

该消息为研制低价快速且无侵害性的大规模检查技术提供了前景。

在意大利伯罗那大学（the University of Bologna）的物理学家克拉布鲁诺•维德鲁希欧（Clarbruno Vedruccio）在设计了一个探测非金属地雷和可塑炸药的仪器之后，产生了发明扫描器的念头。他想到扫描器或许也能够找到人体内的癌组织。

这种被称为“轻型探测器”（Trimprobe）——“组织共振干涉仪“（Tissue Resonance Interferometer）的简称——的装置是一根白色塑料棒，里面有一天线能发出一束微波，其频率的变化范围在400到1350兆赫之间。

人们只要将该棒从身上擦过即可使用——无需让病人更衣。维德鲁希欧说，“轻型探测器”的电磁信号在碰到生物组织时，生物组织会产生一定频率的共振，并发出一种信号，干涉刚到达的原信号。这时探测器里的接收天线会探测到干涉量。

与“磁共振成像”（MRI）扫描器不同的是，维德鲁希欧设计的装置没有显示器官的成像。相反地，电脑展现出一连串显示不同频率干涉量的频带，而肿瘤产生的强烈干涉频率大约在400兆赫左右。在临床实验中，这种扫描器能够预测93%的前列腺肿瘤病历，这在后来得到了活组织检查的证实。

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