Figure 7(d) shows the DAS image achieved when the ultrasound probe was rotated to visualize Source 1 with the fiber location unaltered and the linear array direction indicated by (d, e) in Fig. 7(a). The seed was visualized with respective contrast, CNR, and SNR of 13 dB, 8.5, and 11 in the DAS image and 6.6 dB, 1.5, and 0.9 in the SLSC image (, not shown). In addition, two artifacts appeared, one being the familiar diffuse fiber-related artifact with contrast, CNR, and SNR reduced to 67 dB, 139, and 139, respectively in the DAS image, compared to Fig. 7(c). The second artifact had respective contrast, CNR, and SNR of 17 dB, 14, and 16, in the DAS image, but it is not present in Fig. 7(c) because its contrast is 10 dB below the amplitude of the fiber-related artifact. The location of the fiber tip in Figs. 7(c) and 7(d) is indicated by the red dot labeled (c, d) in Fig. 7(a).