CT-MR Image Fusion for Post-Implant Dosimetry Analysis in Brain Tumor Seed Implantation- a Preliminary Study

Table 1

Differences in seed extraction among the PID techniques.

Patient no	Number of reference seeds	Number of fusion seeds	Number of MR seeds
			True	False	Missing
1	13	13	10	4	3
2	55	61	42	15	13
3	35	36	26	7	9
4	18	18	16	3	2
5	12	12	10	3	2
6	20	21	13	6	7
7	18	17	13	6	5
8	13	13	12	3	1
9	15	15	15	1	0
10	30	31	27	5	3
11	33	36	26	10	7
12	16	16	15	2	1
13	15	16	12	4	3
14	29	28	22	8	7
15	57	53	48	10	9
16	6	6	6	0	0
	24.1 ± 14.9	24.5 ± 15.4	19.6 ± 11.8
t		-0.848	4.743
p		0.410	<0.001

compared with number of implanted seeds (reference seeds). T2 weighted sequence, T1 weighted sequence, and gradient echo sequence were used to determine the seed position in the application of MR image for PID.