Computed Tomography Scanner Productivity and Entry-Level Models in the Global Market

Table 1

Average and standard deviation (sd) of measured times in CT exam stages, stage percentage contribution (pc), total exam times, and theoretical maximum weekly exam productivities. Times in minutes () and seconds ().

Exam stage		Single-slice (all)	Single-slice (modern)	Dual-slice	4-slice	16-slice	128-slice
Arrival	Average	39	34	202	125	40	—
	sd	35	14	49	243	23
	pc	5.00	5.55	19.66	14.26	7.31
Preparation	Average	209	145	130	121	32	53
	sd	145	104	48	124	31	59
	pc	16.50	17.13	7.30	13.11	5.85	15.92
Positioning	Average	123	116	150	120	233	138
	sd	35	38	38	143	149	134
	pc	10.64	12.40	16.85	13.11	27.97	29.43
Data entry	Average	109	108	113	134	56	40
	sd	41	44	30	113	22	19
	pc	8.85	11.09	11.66	15.25	10.24	12.01
Image acquisition	Average	538	327	205	231	241	44
	sd	435	130	31	124	111	32
	pc	43.33	33.77	17.56	24.75	29.43	13.21
Patient departure	Average	202	203	312	159	145	138
	sd	58	105	136	124	114	25
	pc	15.64	20.07	26.97	19.51	19.20	29.43
Total	Average	1300	1013	1152	1010	907	533
	sd	534	252	256	511	408	445
Productivity		304	387	333	389	434	713