RESUMO
T1-W imaging of the pediatric abdomen is often limited by respiratory motion artifacts. Although navigation has been commonly employed for coronary MRA and T2-W imaging, navigation for T1-W imaging is less developed. Thus, we incorporated a navigator pulse into a fat-suppressed T1-W SPGR sequence such that steady-state contrast was not disrupted. Ten children were scanned after gadolinium administration three times in immediate succession: breath-hold with no navigation, free-breathing with navigation, and free-breathing without navigation. Motion artifacts were scored for each sequence by two radiologists,showing fewer motion artifacts with navigation compared to free-breathing and greater motion artifacts than with breath-holding. This work demonstrates the feasibility and potential utility of navigation for pediatric abdominal T1-W imaging.
Assuntos
Abdome/patologia , Artefatos , Aumento da Imagem/métodos , Imageamento por Ressonância Magnética/métodos , Movimento , Mecânica Respiratória , Adolescente , Adulto , Criança , Pré-Escolar , Feminino , Humanos , Lactente , Masculino , Reprodutibilidade dos Testes , Sensibilidade e EspecificidadeRESUMO
PURPOSE OF REVIEW: Pediatric pelvic MRI has had dramatic advances in the past few years. This review documents studies demonstrating the accuracy of MRI for the evaluation of uterine and vaginal anomalies and discusses the salient changes to MRI methods that are particularly applicable to evaluating the pediatric patient with these developmental anomalies. RECENT FINDINGS: MRI has high accuracy for evaluation of uterine and vaginal anomalies. Significant advances, such as volumetric imaging, increased resolution, decreased motion artifacts, and shorter examination time, have increased the access and utility of MRI for pediatric patients. SUMMARY: MRI techniques have evolved markedly in the past several years, providing a robust method of evaluating uterine and vaginal anomalies in the pediatric patient.
