Acquisition and reconstruction of the abdominal phantom modeling hepatic metastases. The figure shows liver-SIRT phantom acquisition and reconstruction. (A) The bed holder and the three tape measures. (B) The counterweight lever system that does not allow pure radial motion. The bottom row shows the images of the liver model and reconstructed oblique slices passing through the middle of the liver model for 36-, 3.6-, and 1-min acquisitions. (a) The VOI sample in the healthy liver. (b) The necrotic tumor and (c) the isolated tumor with both specific activities fourfold that of the healthy liver. (d, e, f) The cylinders with specific activities 0.5, 0.5, and 0.25 times that of the healthy liver, respectively. The cylinder (f) section is smaller than that of cylinders (e) and (d) because cylinder (f) was not centered.