Figure 1.

Sketch of animal positioning: Each patient-derived xenograft (PDX)-bearing mouse was placed on its side in a half-cylinder cradle. Respiratory motion–induced artifacts were minimized with (i) a ridged plastic panel (10) and (ii) judicious use of tape at locations above and below the tumor (dashed lines) and applied very lightly over the tumor (dotted lines). The tape over the mouse body also secured the ridged plastic panel in place. The surface-coil receiver was placed immediately above the tumor (8).