Portal de Periódicos da CAPES

<title>Tumor detection using time-resolved light transillumination</title>

1991; SPIE; Volume: 1525; Linguagem: Inglês

10.1117/12.48209

1996-756X

Roger Berg, Stefan Andersson‐Engels, O. Jarlman, Sune Svanberg,

Non-Invasive Vital Sign Monitoring

A time-gated technique to reduce the effect of light scattering when transilluminating turbid media such as tissue is demonstrated. The concept is based on transillumination with picosecond laser pulses and time-resolved detection. By detecting only the photons with the shortest travelling time, and thus the least scattered photons, the contrast can be enhanced. Measurements on a tissue phantom as well as breast tissue in vitro are presented. It is demonstrated that the spatial resolution can be enhanced by using the time-gated technique. It is also shown that differences in scattering properties may be more pronounced than differences in absorption properties when demarcating tumor from normal tissue.