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Patient positioning for decubitus CTM. A, A custom-made firm wedge with a 20° angle is placed on the CT gantry, and the hips are placed at the apex of the wedge with the feet closest to the scanner bore. If no wedge is available, 1–2 pillows can be placed instead. Pillows can also be used to support the legs. B, A lateral scout radiograph shows an adequate angle to facilitate contrast transit from the lumbar puncture to the remainder of the spine.
