Table 2. Comparison of Injected iodine quantity and Estimated Iodine quantity on iodine (-water) images. Average of three measurements.

Comparison of Injected iodine quantity and Estimated Iodine quantity on iodine (-water) images. Table shows absolute and percentage errors between the iodine amounts estimated on iodine maps and injected values. Absolute and percentage errors are calculated by taking the average of three estimates. All percentage errors with the three segmentation methods were less than than 10%, with the exception of sausage IX, which was overestimated by more than 17% with the three methods, and sausage X, which was underestimated by more than 40% with the three segmentation methods. I: Iodine; % error: percentage error.

	ID	Injected I (mg)	Manual Segmentation			Fixed threshold			Semi-automatic Segmentation
			I Quantity (mg)	Absolute Error (mg)	% Error	I Quantity (mg)	Absolute Error (mg)	% Error	I Quantity (mg)	Absolute Error (mg)	% Error
Liver No.1	I	240.00	224.27	−15.74	−6.56	225.64	−14.36	−5.98	228.38	−11.62	−4.84
	II	120.00	127.88	7.88	6.57	129.26	9.26	7.71	126.57	6.57	5.48
	III	150.00	139.02	−10.98	−7.32	136.76	−13.24	−8.83	139.28	−10.72	−7.15
	IV	Leakage
	V	300.00	286.88	−13.12	−4.37	283.95	−16.05	−5.35	284.38	−15.62	−5.21
Liver No.2	VI	Leakage
	VII	270.00	287.32	17.32	6.41	290.48	20.48	7.59	285.24	15.24	5.64
	VIII	240.00	254.22	14.22	5.92	254.04	14.04	5.85	249.82	9.82	4.09
	IX	150.00	176.64	26.64	17.76	178.44	28.44	18.96	177.44	27.44	18.29
	X	120.00	71.66	−48.34	−40.28	70.44	−49.56	−41.30	69.07	−50.93	−42.44
	Average			−2.76	−2.73		−2.62	−2.67		−3.73	−3.27