Skip to main content
. Author manuscript; available in PMC: 2010 Dec 20.
Published in final edited form as: Magn Reson Med. 2008 May;59(5):1051–1061. doi: 10.1002/mrm.21436

FIG. 4.

FIG. 4

Photograph and schematic illustrating the mechanism of the phantom simulating respiratory motion during the inhalation and exhalation phases. The agar phantom was inserted into an acrylic resin cylinder with an internal diameter of 140 mm and a height of ≈110 mm. A balloon was placed under the agar phantom and connected to a ventilator to lift up the phantom during inflation. In addition to the force from the balloon, the phantom hung from a spring (a rubber band) connected to the top of the cylinder in order to control the speed of the phantom while moving up and down.