The effects of repeated brain MRI on chromosomal damage

European Radiology Experimental

Table 1 Description of the cohort of volunteers

Subject number	Sex	Age at the 1st MRI (years)	Months between 1st and 10th MRI	Months between 1st and 20th MRI	Months between 1st and 25th MRI
S1	M	27	13	33	36
S2	M	28	10	25	33
S3	M	38	11	28	35
S4	M	33	13	31	39
S5	F	38	11	28	39
S6	M	28	10	33	38
S7	M	39	21	34	48
S8	M	36	7	22	34
S9	M	30	7	18	23
S10	M	27	11	36	44
S11	M	41	7	23	32
S12	M	32	25	–	–
S13	F	36	14	–	–

Thirteen participants were selected for this study, which lasted 3 to 4 years, depending on the participant. They are all non-smokers and young adults. Ten were included for the entire study, as they received 26 MRI exams but no radiation exposure. Subject number 8 (reported in bold characters) was exposed to repetitive computed tomography exams and was excluded from the global analysis. The two volunteers (number 12 and number 13; in italics) have not yet finished the study and were considered only for the analysis of the effects following the first MRI session. MRI Magnetic resonance imaging