Table 1.

The distribution of the subjects

Generation	Male	Female	Sub total	The reasons for the order of the imaging study
				Headache	Psychological abnormality	Visual abnormality	Screening for metastasis	Screening for aneurysm	Follow-up for small aneurysm (< 3 mm)
10–19	11	13	24	13	10	1
20–29	9	12	21	7	13	1
30–39	6	8	14	2	7	2		3
40–49	7	8	15		1		2	11	1
50–59	9	10	19	1	1		8	8	1
60–69	8	6	14				8	5	1
70–79	7	8	15				5	9	1
80–89	3	3	6			1	3	2