Utility of Quantitative ^99mTc-MAA SPECT/CT for ⁹⁰yttrium-Labelled Microsphere Treatment Planning: Calculating Vascularized Hepatic Volume and Dosimetric Approach

Table 2

Opertor 2 results.

Phantom configuration		True sphere/; background ratio	SPECT alone			SPECT-CT
			Isocontour (%)	Measured volume (cm^3)	Error (%)	Isocontour (%)	Measured volume (cm^3)	Error (%)
18,5 MBq/sphere	Cylinder 1	—	1%	7087	5,52	2%	6521	−2,90
	Sphere 1	2.8	31%	207	276,36	48%	57,2	4,00
	Sphere 2	7.6	13%	104,5	397,62	28%	24,4	16,19
	Sphere 3	9.6	19%	27,4	71,25	29%	16,9	5,62
	Sphere 4	19.6	8%	29,2	265,00	19%	10,9	36,25
37 MBq/sphere	Cylinder 1	—	2%	6180	−7,98	1%	6700	−0,24
	Sphere 1	6	7%	169,7	208,55	34%	53,56	−2,62
	Sphere 2	17	3%	113,7	441,43	23%	24,34	15,90
	Sphere 3	23.4	3%	119,78	648,63	27%	14,9	−6,88
	Sphere 4	43.8	4%	53,48	568,50	33%	9,8	22,50
55,5 MBq/sphere	Cylinder 1	—	1%	6737	0,31	1%	6737	0,31
	Sphere 1	9.9	10%	159,3	189,64	35%	55,7	1,27
	Sphere 2	29.6	4%	85	304,76	25%	22,7	8,10
	Sphere 3	38.6	7%	51,5	221,88	36%	15,5	−3,13
	Sphere 4	73.1	6%	44,1	451,25	36%	12	50,00
74 MBq/sphere	Cylinder 1	—	1%	6565	−2,10	1	6565	−2,10
	Sphere 1	16	15%	99,5	80,91	32%	56	1,82
	Sphere 2	45	6%	54,1	157,62	23%	23,7	12,86
	Sphere 3	57	5%	42,8	167,50	25%	17,4	8,75
	Sphere 4	114	2%	35,8	347,50	20%	8,7	8,75
55 MBq	Cylinder 2	—	17%	887	14,60	27%	801	3,49
116 MBq	Cylinder 2	—	19%	855	10,47	29%	775	0,13
72 MBq	Cylinder 3	—	21%	520	9,94	27%	481	1,69