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Fig. 2 | BMC Surgery

Fig. 2

From: Size selection and placement of pedicle screws using robot-assisted versus fluoroscopy-guided techniques for thoracolumbar fractures: possible implications for the screw loosening rate

Fig. 2

Measurement methods for mean CT Hounsfield Unit (HU) values: a 41-year-old male patient was diagnosed with a vertebral fracture in L1. A The mean CT Hounsfield Unit (HU) values of the T12 vertebral body (VB) were 176, and the right and left pedicles (excluding the cortical bone) were 133 and 136 respectively; B the mean HU values of the right and left pedicles of the L1 (fractured vertebra) were 157 and 144 respectively; C the mean HU values of the L2 VB was 164, and the right and left pedicle were 160 and 147 respectively. The mean HU values of the patient was 152.1 = [(176 + 133 + 136 + 157 + 144 + 164 + 160 + 147)/8]

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