Final answer:
The IR size for AP and Lateral Tib/Fib x-rays is typically 14x17 inches, and the SID is usually 40 inches. The AP x-ray is taken with the patient lying on their back, while the Lateral x-ray is taken with the patient positioned on their side.
Step-by-step explanation:
The AP (anteroposterior) and Lateral (side view) Tib/Fib (Tibia/Fibula) x-rays are used to diagnose and evaluate fractures or other problems in the lower leg. The IR (Image Receptor) size refers to the size of the x-ray film or digital sensor used to capture the image. The SID (Source-to-Image Distance) is the distance between the x-ray source and the image receptor.
For AP Tib/Fib x-rays, the IR size commonly used is 14x17 inches, and the SID is typically 40 inches. The patient would lie on their back with the leg extended, and the x-ray beam would pass through the leg from the front to the back.
For Lateral Tib/Fib x-rays, the IR size is usually the same, 14x17 inches, and the SID may also be 40 inches or slightly longer. The patient would be positioned on their side, with the affected leg placed against the image receptor. The x-ray beam would then pass from the side of the leg to capture a side view of the tibia and fibula.