Initial practice on quality control tests and action limits setting of birdcage head coils / 中国医学影像技术

ABSTRACT

Objective To establish clinical quality control method with testing the birdcage head coils and setting up the action limits.Methods Three different MR devices (GE 1.5T HDi,GE 3.0T HD and GE 3.0T 750W) and corresponding birdcage coils were tested.Axial T1WI was performed to scan ACR phantom.SNR,percent image uniformity (PIU) and percent signal ghosting (PSG) were measured for six times,and the mean values and standard deviations (SD) were calculated.Based on the results,the action limits for each parameter were set.Results The mean value of SNR for the three devices was 262.14,280.47 and 474.24,and SD was 18.43,29.67 and 29.95,respectively;the action limits were ≥225.28,≥221.13 and ≥414.34,respectively;the mean value of PIU for the three devices was 95.00％,83.17％ and 84.33％,SD was 0.63％,1.17％ and 0.82％,respectively;the action limits were ≥93.74％,≥82.00％ (corrected) and ≥82.69％,respectively.The mean value of PSG for the three devices was 0.11％,0.07％ and 0.14％,SD was 0.12％,0.03％ and 0.11％,respectively;the action limits were ≤0.35％,≤0.13％ and ≤0.36％,respectively.Conclusion All of SNR,PIU and PSG for three MR devices were consistent with the action limits in this study.