Evaluation of a Flexible 12-Channel Screen-printed Pediatric MRI Coil.

Background: Screen-printed MRI coil technology may reduce the need for bulky and heavy housing of coil electronics and may provide a better fit to patient anatomy to improve coil performance. Purpose: To assess the performance and caregiver and clinician acceptance of a pediatric-sized screen-printed flexible MRI coil array compared with conventional coil technology. Materials and Methods: A pediatric-sized 12-channel coil array was designed by using a screen-printing process. Element coupling and phantom signal-to-noise ratio (SNR) were assessed. Subjects were scanned by using the pediatric printed array between September and November 2017; results were compared with three age- and sex-matched historical control subjects by using a com-mercial 32-channel cardiac array at 3T. Caregiver acceptance was assessed by asking nurses, technologists, anesthesiologists, and subjects or parents to rate their coil preference. Diagnostic quality of the images was evaluated by using a Likert scale (5 = high image quality, 1 - nondiagnostic). Image SNR was evaluated and compared. Results: Twenty study participants were evaluated with the screen-printed coil (age range, 2 days to 12 years: 11 male and nine male subjects). Loaded pediatric phantom testing yielded similar noise covariance matrices matrices and only slightly degraded SNR for the printed coil as compared with the commercial coil. The caregiver acceptance survey yielded a mean score of 4.1 +/- 0.6 (scale: 1, preferred the commercial coil; 5, preferred the printed coil). Diagnostic quality score was 4.5 +/- 0.6. Mean image SNR was 54 +/- 49(paraspinal muscle), 78 +/- 51 (abdominal wall muscle), and 59 +/- 35 (psoas) for the printed coil, as compared with 64 +/- 55, 65 +/- 48,and 57 +/- 43, respectively, for the commercial coil; these SNR differences were not statistically significant (P = .26). Conclusions: A flexible screen-printed pediatric MRI receive coil yields adequate signal-to-noise ratio in phantoms and pediatric study participants, with similar image quality but higher preference by subjects and their caregivers when Compared with a conventional MRI coil. (C) RSNA, 2019