Journal
MAGNETIC RESONANCE IN MEDICINE
Volume 85, Issue 6, Pages 3169-3181Publisher
WILEY
DOI: 10.1002/mrm.28649
Keywords
artifacts; free induction decay navigators; motion detection; pediatric neuroimaging
Funding
- Eunice Kennedy Shriver National Institute of Child Health and Human Development [IDDRC U54 HD090255]
- National Institute of Biomedical Imaging and Bioengineering [R01 EB019483]
- National Multiple Sclerosis Society [PP-1905-34002]
- Thrasher Research Fund [14989]
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The integrated motion metrics from FIDnavs in structural MRI are a valuable predictor of diagnostic image quality, leading to significant time and cost savings when applied to pediatric MRI examinations.
Purpose To investigate the ability of free induction decay navigator (FIDnav)-based motion monitoring to predict diagnostic utility and reduce the time and cost associated with acquiring diagnostically useful images in a pediatric patient cohort. Methods A study was carried out in 102 pediatric patients (aged 0-18 years) at 3T using a 32-channel head coil array. Subjects were scanned with an FID-navigated MPRAGE sequence and images were graded by two radiologists using a five-point scale to evaluate the impact of motion artifacts on diagnostic image quality. The correlation between image quality and four integrated FIDnav motion metrics was investigated, as well as the sensitivity and specificity of each FIDnav-based metric to detect different levels of motion corruption in the images. Potential time and cost savings were also assessed by retrospectively applying an optimal detection threshold to FIDnav motion scores. Results A total of 12% of images were rated as non-diagnostic, while a further 12% had compromised diagnostic value due to motion artifacts. FID-navigated metrics exhibited a moderately strong correlation with image grade (Spearman's rho >= 0.56). Integrating the cross-correlation between FIDnav signal vectors achieved the highest sensitivity and specificity for detecting non-diagnostic images, yielding total time savings of 7% across all scans. This corresponded to a financial benefit of $2080 in this study. Conclusions Our results indicate that integrated motion metrics from FIDnavs embedded in structural MRI are a useful predictor of diagnostic image quality, which translates to substantial time and cost savings when applied to pediatric MRI examinations.
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