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Computed tomography (CT) images showing region of interest (ROI) placement in the first lumbar vertebra (L1) of a patient. Sagittal multiplanar reformatting CT images (A) show L1 vertebra level and measurement localization. In this selected level, a ROI was placed in the upper part of L1 between the endplate and the entrance of vessels at the midportion (B). The ROI was as large as possible and positioned in a homogenous area without including the cortical bone.
