Comparison of Imaging Characteristics of ¹²⁴I PET for Determination of Optimal Energy Window on the Siemens Inveon PET

Table 4

Spillover ratio in air and water compartments with attenuation, scatter, and single gamma photon correction applied.

Energy window	Air	Water	wSOR^‡
350~550	−5.03	1.01	1.30
350~600	−4.33	1.26	1.43
350~625	−3.40	1.80	1.86
350~650	−2.68	2.87	2.86
350~675	−4.14	2.15	2.22
350~700	−6.47	0.79	1.32
350~725	−5.85	0.39	1.03
350~750	−5.54	0.26	0.95
350~775	−5.77	1.58	1.83
350~800	−5.41	2.36	2.49
400~590	−5.75	1.40	1.67
Mean difference	4.28	6.74	N/A
Mean difference^†	7.66	12.79	N/A

Mean difference: mean difference of spillover ratio between attenuation correction and attenuation and scatter correction.
^†Mean difference: mean difference of spillover ratio between attenuation correction and attenuation and scatter and single gamma photon correction.
^‡Weighted SOR (wSOR).
Not applicable.