Fig. 6.

(a) Schematic of the SBH-PACT system. The breast is scanned using a 512-element ring array transducer. The laser illuminates in a donut-shaped beam from the bottom. (b) Depth-encoded angiogram of a 44-year-old patient with fibroadenoma in the right breast acquired by SBH-PACT. The white dashed circle represents the tumor region. (c) PA MAP image of vessels deeper than the nipple of a 44-year-old female patient with an IDC in the left breast. Vessel density map (red) is overlaid on the MAP image but does not clearly demarcate the tumor region. (d) The PA elastographic image for the relative area change during breathing in blue dashed region in (c) is shown. Tumors are less compliant in comparison to normal breast tissue; therefore, they have smaller detectable relative area change when PA elastography is performed. The tumor could not be identified by SBH-PACT alone, however, elastographic study revealed the tumor marked by the red circle. This work by Lin et al.³¹ is licensed under a Creative Commons Attribution 4.0 International License.