Dynamic contrast-enhanced magnetic resonance imaging (MRI) for tracking glymphatic system transport with paramagnetic contrast such as gadoteric acid (Gd-DOTA) administration into cerebrospinal fluid (CSF) requires pre-contrast data for proper quantification. Here we introduce an alternative approach for glymphatic system quantification in the mouse brain via T1 mapping which also captures drainage of Gd-DOTA to the cervical lymph nodes. The Gd-DOTA injection into CSF was performed on the bench after which the mice underwent T1 mapping using a 3D spoiled gradient echo sequence on a 9.4 T MRI. In Ketamine/Xylazine (KX) anesthetized mice, glymphatic transport and drainage of Gd-DOTA to submandibular and deep cervical lymph nodes was demonstrated as 25-50% T1 reductions in comparison to control mice receiving CSF saline. To further validate the T1 mapping approach we also verified increased glymphatic transport of Gd-DOTA transport in mice anesthetized with KX in comparison with ISO. The novel T1 mapping method allows for quantification of glymphatic transport as well as drainage to the deep and superficial cervical lymph nodes. The ability to measure glymphatic transport and cervical lymph node drainage in the same animal longitudinally is advantageous and time efficient and the coupling between the two systems can be studied and translated to human studies. The glymphatic system (GS) in rodents was first described by Iliff and Nedergaard in 2012 as a brain-wide perivascular transit passageway for cerebrospinal fluid (CSF) facilitating waste clearance in an aquaporin 4 (AQP4) water channel dependent manner 1. Visualization and quantification of GS transport in whole mouse brain was performed ex vivo by first allowing tracers administered into CSF to circulate for a prefixed time interval (30 min-2 h) after which the rodents were euthanized and their brains examined for tracer uptake using fluorescence microscopy 1. In 2013, we introduced dynamic contrast enhanced magnetic resonance imaging (DCE-MRI) as an in vivo method for tracking GS transport in the whole rodent brain 2 and later refined gadolinium based contrast administration into CSF and GS quantification 3,4. The DCE-MRI approach for brain-wide GS transport assessment has been widely used and adapted to different species including mice 5-7 , non-human primates 8 , and humans 9,10. Recently, the DCE-MRI approach for GS transport assessment was extended to studies in awake rats. The DCE-MRI GS method involves administering small molecular weight (MW) (e.g. gadopentetic acid MW 547 Da, gadoteric acid (Gd-DOTA), MW 559 Da) or large MW (e.g. GadoSpin P, MW 200 kDa) paramagnetic tracers into CSF via the cisterna magna (CM) 2,3 , cerebral lateral ventricles 11 or lumbar intrathecal route 9. Transport of the paramagnetic contrast molecule (a.k.a. 'solute') from CSF into brain parenchyma is tracked dynamically by a series of 3D T1-weighted MRI scans 1. The time series of 3D T1-weighted spoiled gradient echo (SPGR) brain images acquired before, during and after solute...