376415.fig.001a
(a)
376415.fig.001b
(b)
376415.fig.001c
(c)
376415.fig.001d
(d)
376415.fig.001e
(e)
376415.fig.001f
(f)
376415.fig.001g
(g)
376415.fig.001h
(h)
Figure 1: The construction of the pericardiocentesis phantom. (a) A celluloid table tennis ball is filled with water. (b) The ball is placed onto a balloon filled with ink-colored water. (c) The balloon is filled with water. (d) The balloon is dereated and knotted. (e) The container is filled with gel wax. (f) The balloon is placed onto the gel wax. (g) The container is filled with ultrasound gel. (h) All air bubbles are smoothed using a syringe or a spoon.