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(a) Ultrasound tomography system. Transmission (b) and time-of-flight image (c) of a PAG irradiated with a 4 × 4 cm2 square photon beam. Scan lines are acquired at a translational resolution of 1 mm and a rotational resolution of 2° with a total rotation of 360°. The reconstructed image resolution was 1.45 × 1.45 mm2 (Mather and Baldock 2003). Reproduced with permission.
