In an MRI scan, the larger the patient's body, the farther away the test target area is from the center. Therefore,
this study aims to measure the changes in image quality according to distance from the center of the MRI
machine’s bore and provide a reference distance that does not cause image degradation during actual examinations.
The data from a total of nine points at 5 cm, 10 cm, 15 cm, and 20 cm away from the center of the MRI
bore in both directions were obtained and compared with the measurement data of the isocenter. As for the
experimental equipment, the 3.0 Tesla MRI device and the 16-channel GEM Flex Suite (small) were used to
acquire the TI and T2 images of the old Phantom. Furthermore, the Image J program analyzed the mean difference
between SNR and CNR. As a result of the statistical analysis, The one-way batch ANOVA and Duncan’s
posthoc test results showed no statistically significant difference between the measurements from the
center at 5 cm, 10 cm, and 15 cm positions (p < 0.001). However, at the 20 cm position, the standard deviation
of the noise increased by more than 10 %, for the values of SNR and CNR to decrease rapidly.