The effect of object size on the sensitivity of single photon emission computed tomography: comparison of two CZT cardiac cameras and an Anger scintillation camera

EJNMMI Physics

Table 1 Count rates corresponding to different syringe water column heights

D-SPECT	Water column height	3.4 cm	4.4 cm	5.5 cm	6.5 cm	7.5 cm
		Kilocounts per minute per megabecquerel					CV^a	Mean CV^b
	Series 1	39.62	38.25	36.79	35.19	33.54	0.066	0.080
	Series 2	41.63	40.35	37.43	36.16	33.49	0.086
	Series 3	38.53	35.70	35.28	32.30	30.33	0.092
	Series 4	37.20	35.73	33.84	32.31	30.30	0.081
	Series 5	37.86	35.39	34.30	31.98	31.35	0.077
D530c	Water column height	3 cm	4.2 cm	5.4 cm	6.6 cm	7.8 cm
		Kilocounts per minute per megabecquerel					CV^a	Mean CV^b
	Series 1	18.38	18.78	18.81	19.76	20.42	0.043	0.028
	Series 2	22.66	23.26	23.86	24.39	24.84	0.037
	Series 3	19.03	19.25	19.60	20.07	20.62	0.033
	Series 4	19.32	19.32	19.63	19.81	19.92	0.014
	Series 5	18.35	18.04	18.14	18.00	18.57	0.013
A-SPECT	Water column height	3 cm	4.2 cm	5.4 cm	6.6 cm	7.8 cm
		Kilocounts per minute per megabecquerel					CV^a	Mean CV^b
	Series 1	7.65	7.47	7.53	7.52	7.33	0.015	0.009
	Series 2	7.06	6.95	6.91	6.89	6.87	0.011
	Series 3	6.97	6.89	6.90	6.89	6.93	0.005
	Series 4	6.92	6.86	6.85	6.88	6.91	0.005
	Series 5	6.94	6.84	6.86	6.80	6.84	0.007