Fig. 4: Imaging largely unaffected by servomotor presence and operation.

a Photograph depicting orientation of servomotor and phantom for SNR imaging tests. b Side view schematic of (a) where d denotes the distance between the phantom and servomotor axle. c Normalized SNR image quality measurement for d = 45, 30, and 15 cm. For each distance three scenarios were tested: motor off, motor on (driven by DC power supply), and motor on (driven by unfiltered PWM signal from H-bridge controller where a 50% square wave duty cycle was used). Error bars denote standard deviation of 12 SNR measurements obtained for each scenario. For all tested scenarios, SNR differed from the control measurement (no motor) by less than 1.5%.