1. Common mistakes in BMD testing
Acquisition Pitfall
Incorrect demographic information
External artifacts
Improper patient positioning
Internal artifacts

2. a) Incorrect Demographic Information

3. b. External Artifacts not removed from scanned area
18-year-old girl with anorexia nervosa. Dual energy x-ray absorptiometric (DEXA) image shows density superimposed on L4 (arrow) found to be metallic removable piercing not noticed by technologist.
Examination was repeated after removal of object, and L4 Z-score decreased from 1.6 to –3 and L1–L4 Z-score from –1.7 to –3.

4. The spine is too close to the right side of the image

5. The femur is adducted