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.
MRI Navigation Motion artifacts T1-weighted imaging Children
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Wang Y, Rossman PJ, Grimm RC et al (1996) Navigator-echo-based real-time respiratory gating and triggering for reduction of respiration effects in three-dimensional coronary MR angiography. Radiology 198:55–60PubMedGoogle Scholar
Klessen C, Asbach P, Kroencke TJ et al (2005) Magnetic resonance imaging of the upper abdomen using a free-breathing T2-weighted turbo spin echo sequence with navigator triggered prospective acquisition correction. J Magn Reson Imaging 21:576–582CrossRefPubMedGoogle Scholar
Sachs TS, Meyer CH, Hu BS et al (1994) Real-time motion detection in spiral MRI using navigators. Magn Reson Med 32:639–645CrossRefPubMedGoogle Scholar
Hirokawa Y, Isoda H, Maetani YS et al (2008) MRI artifact reduction and quality improvement in the upper abdomen with PROPELLER and prospective acquisition correction (PACE) technique. AJR 191:1154–1158CrossRefPubMedGoogle Scholar
Bailes DR, Gilderdale DJ, Bydder GM et al (1985) Respiratory ordered phase encoding (ROPE): a method for reducing respiratory motion artifacts in MR imaging. J Comput Assist Tomogr 9:835–838CrossRefPubMedGoogle Scholar
Kanematsu M, Goshima S, Kondo H et al (2007) Gadolinium-enhanced multiphasic 3D MRI of the liver with prospective adaptive navigator correction: phantom study and preliminary clinical evaluation. AJR 188:W309–W316CrossRefPubMedGoogle Scholar
Beatty P, Brau A, Chang S et al (2007) A method for autocalibrating 2D-accelerated volumetric parallel imaging with clinically practical reconstruction times. Joint Annual Meeting ISMRM-ESMRMB, Berlin, p 1749Google Scholar