Table 1.

Summary of the number of fiducial markers, tumor location, and gross tumor volume (GTV) (as contoured on the planning CT) for each patient. The gantry speed, time interval required for a nine-degree arc acquisition of each scan are also shown.

Patient No.	1	2	3	4
Number of scans	3	2	3	3
Number of fiducial markers	2	4	2	1a
Tumor locationb	RUL	Right hilum	Right hilum/RLL	LLL
GTV volume (cm3)	88.9	30.3	58.3c	42.7
Gantry speed (deg/s)	1.5	1.5 or 0.75d	0.75	0.75
Short arc time interval (s)	6	6 or 12e	12	12

^aTwo markers implanted within close proximity and segmented as one.

^bRUL=right upper lobe; RLL=right lower lobe; LLL=left lower lobe.

^cSum of two isolated volumes.

^dScan 1 of patient 2: 1.5 deg/s. Scan 2 of patient 2: 0.75 deg/s.

^eScan 1 of patient 2: 6 s. Scan 2 of patient 2: 12 s.