Breast cancer diagnosis by laser transmission photo-scanning with spectro-analysis (report 4).

The laser transmission photo-scanning (LTPS) is a non-invasive imaging technique for breast examination that is based on the fact that tumors have a different light transmission rate than normal tissues. The LTPS equipment used in our study was improved by adopting a dual (red and infrared) beam scan method. LTPS results of 19 patients are presented here, together with their mammography results. Sixteen positive cases were detected by LTPS, while mammography yielded 15 out of 19 cases. In our study, LTPS images were similar in accuracy to those of X-ray mammography. This dual-wavelength LTPS system improved the tumor sensitivity and specificity of transmission images. It may be possible to present pathophysiological data in addition to anatomical data, to distinguish malignant from benign tumors.