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Obliques

Patient position

Supine for AP; lateral recumbent for lateral.

Part position

MSP centered; knees flexed for AP to reduce lordosis.

Central ray

Iliac crest (L4).

IR placement

35x43 cm.

Tech pearls

Lateral L5/S1 spot often needs +5–10 kVp.
Sponge under waist on lateral keeps spine parallel to table.

L5/S1 Spot Series overview