Initial experience of an investigational 3T MR scanner designed for use on neonatal wards.

OBJECTIVES: MR imaging of neonates is difficult for many reasons and a major factor is safe transport to the MR facilities. In this article we describe the use of a small, investigational 3-T MR customised for brain imaging and sited on a neonatal unit of a tertiary centre in the UK, which is in contrast to a 300-m journey to the whole-body MR scanner used at present for clinical cases. METHODS: We describe our methods for preparing babies for safe transport and scanning on an investigational 3-T MR scanner on a neonatal unit and the development of appropriate MR sequences. The MR scanner does not have CE marking at present so this early development work was undertaken on normal neonates whose parents consented to a research examination. RESULTS: Fifty-two babies were scanned and there were no serious adverse events. The MR examinations were considered to be diagnostically evaluable in all 52 cases and in 90% the imaging was considered to be at least as good as the quality obtained on the 1.5-T scanner currently used for clinical cases. CONCLUSION: We have shown that this investigational 3-T MR scanner can be used safely on a neonatal unit and we have refined the MR sequences to a point that they are clinically usable. KEY POINTS: • Access to neonatal MR imaging is limited. • We describe an investigational 3-T MR scanner site on a neonatal unit. • The scanner produces images suitable for clinical practice.

Preliminary results on validity and reliability from two prospective cohort studies on a new Neonatal Coma Score.

OBJECTIVE: To collect data on content/face validity and interobserver agreement for a Neonatal Coma Score (NCS) in well full-term neonates and on construct validity in unwell and preterm babies, specifically how the NCS changed with gestational age and illness. DESIGN: Prospective cohort studies. SETTING: Two UK tertiary neonatal units (Sheffield and Leeds). PATIENTS: 151 well full-term (≥37 weeks gestational age) newborn babies recruited between January and February 2020 in Sheffield and April and May 2021 in Leeds; 101 sick preterm and full-term babies admitted to Sheffield neonatal unit between January 2021 and May 2022. INTERVENTION: A new NCS. MAIN OUTCOME MEASURES: Determination of normal values in well babies born ≥37 weeks gestational age; data on how the NCS changes with gestational age and illness. RESULTS: Face validity was demonstrated during development of the NCS. The median NCS of well, full-term newborn babies was 15 and the intraclass correlation coefficient was 0.78 (95% CI 0.70 to 0.84). In the 'well' preterm population, 95% <28 weeks had a score ≥11; 28-31 weeks ≥11; 32-36 weeks ≥13 and 37-44 weeks 14-15. The NCS dropped during periods of deterioration, demonstrating evidence of construct validity. Criterion validity was not assessed. CONCLUSIONS: The NCS has good intraobserver agreement in well full-term babies, with a normal NCS 14-15. The NCS in preterm neonates depended on gestational age, and deterioration from baseline was associated with illness. Further work is needed to determine normal scores each gestational age, reliability at lower levels, how early the NCS identifies deterioration and comparison with other assessment tools to demonstrate criterion validity.