Table 1. x, y, and z components of the amplitude of movement of a fiducial marker near the tumor, and data acquisition time, in 8 patients with hepatocellular carcinomas.

Motion ID	x(LR) (mm)	y(SI) (mm)	z(AP) (mm)	Data acquisition time (s)
a	2	15.5	5.7	128
b	2.1	10.7	6.1	133
c	2.4	18	2.8	104
d	2.7	20	7.7	160
e	2.8	17.6	3.9	155
f	1.7	14	2.6	85
g	3.1	12.1	4.8	77
h	2.4	10.2	4.3	47

Data were taken by a X-ray real-time tumor-tracking radiotherapy (RTRT) system.