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. 2016 Sep 5;11(1):26. doi: 10.1186/s13013-016-0088-5

Fig. 1.

Fig. 1

Measurement of midline anteroposterior (AP) spinal canal diameter at L1 to S1 using T1-weighted axial MRI scan (marked in red line) - at the cut where the entire bony canal ring could be seen and with the thickest pedicle width