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Note: Content may be edited for style and length. For women over 40, mammography is a necessary yet annoying procedure to endure every year or two. During a PACT scan, the patient lies face down on a table that has a recess containing ultrasonic sensors and the laser. The laser light diffuses through the breast and is absorbed by oxygen-carrying hemoglobin molecules in the patient's red blood cells, causing the molecules to vibrate ultrasonically. PACT works by shining a near-infrared laser pulse into the breast tissue.

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ScienceDaily, 18 June

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Because the laser light at the currently used wavelength is so strongly absorbed by hemoglobin, PACT can construct images that primarily show the blood vessels present in the tissue being scanned. However, the research showed PACT can provide a clear view of structures as small as a quarter of a millimeter at a depth of 4 centimeters. That's useful for finding cancer because many tumors grow their own blood vessels, surrounding themselves with dense networks of vascular tissue.

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