 This study will examine the use of a flexible belt placed across the patients abdomen to sense and plot the patients respiratory cycle. The point in the respiratory cycle at which the patient holds hisher breath will be recorded at different levels and correlated with CT scans and prior patient breathing levels. Our hypothesis is that a graphical representation of the respiratory cycle may make it easier for the patient to hold his or her breath at the same level each time a CT scan is obtained, or a needle is inserted. If this is true, then this should translate into faster safer procedures, with potentially less ionizing radiation, although this endpoint is not defined in this particular study. 