FIGURE 4. WB attenuation factor images: simulated image (A) and patient image (B). Main differences between images occur at jaw because of amalgam fillings, in right lung because of portal catheter, and at hip because of implant at neck of femur. No negative effects on registration accuracy were seen because of such patient-related details. Noise level is generally low for clinical images; therefore, no separate noise simulations were performed for attenuation factor images.

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