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Fig. 4 | BMC Anesthesiology

Fig. 4

From: Ultrasound-assisted lumbar puncture with a horizontal and perpendicular paramedian approach based on positioning in patients with abnormal spinal anatomy: a case report and technical description

Fig. 4

Marking error due to parallax error. Parallax error in marking the midpoint of the short border of the probe (a′ or c′) occurs when the eyes are not in line with the angle of the probe (a or c), particularly when the probe is not in direct contact with the skin surface (white dotted line). To minimize skin marking inaccuracies (b′), the operator should move the head to keep the line of sight parallel to the ultrasound beam plane (b)

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BMC Anesthesiology

ISSN: 1471-2253

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