51.   But doctors know that dense breast tissue can make it harder to spot tumors on X-rays.

52.   But Jiang says the Clemson model has software that creates absorption as well as scattering images of breast tissue and the extra information will help doctors better diagnose tumors.

53.   Similarly, the transducers act like a lens to focus heat from high-intensity ultrasound waves just on the tumor, leaving other breast tissue unharmed.

54.   The attraction of a light-based system is to give women, especially younger women with dense breast tissue, a safer, cheaper, noninvasive method.