- Sternum, two clavicles, two scapulae, 12 pairs of ribs, and 12 thoracic vertebrae.
### Body Habitus:
1. Asthenic Body Habitus: Characterized by a narrow thorax that is shallow from front to back but long in
vertical dimension.
### Radiographic Considerations:
1. Best kV and SID for Adult Chest Radiography:
- 125 kV and 72-inch SID
2. Shoulder Positioning:
- Pressed downward and toward the IR to reduce chest rotation; rolled forward to remove scapulae
from lung fields.
3. Central Ray Placement for AP Supine Projection of Chest:
- 3 to 4 inches below the jugular notch.
### Respiratory Conditions:
1. Dyspnea: Defined as shortness of breath.
2. Atelectasis: Condition where all or portion of the lung is collapsed.
3. Pulmonary Edema: Condition where excess fluid builds in the lungs due to obstruction of pulmonary
circulation.
### Positioning Errors:
1. PA Chest Radiography Error:
- Rotation into a LAO position results in superimposition of the left sternoclavicular joint over the
spine.
2. Lateral Chest Radiograph Projection Error:
- Raise upper limbs higher to prevent soft tissue from obscuring the apices of the lungs.
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