Term
| Why is a minimum SID of 72" (183 cm) recommended for chest x-rays? |
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Definition
- to decrease magnification of the heart
- to increase recorded detail of the thoracic structures |
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Term
| What position prevents engorgement of the pulmonary vessels? |
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Definition
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Term
| Why might a CXR be ordered with expiration instead of inspiration? |
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Definition
| Pneumothorax is shown more clearly on expiration |
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Term
| The CR for a CXR enters at the level of: |
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Definition
| T7 / inferior angle of the scapula |
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Term
| How many posterior ribs should be visible above the diaphragm on a PA CXR? |
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Definition
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Term
| Which lung is best demonstrated in a left lateral CXR? |
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Definition
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Term
| For an oblique CXR, how many degrees is the pt rotated? |
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Definition
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Term
| For PA oblique projections of the chest (LAO/RAO positions), the side of interest is generally the side (closer/farther) away from the IR. |
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Definition
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Term
| Where should the top of the IR be on an oblique CXR? |
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Definition
| 1.5" - 2" above the vertebral prominens because the top of the shoulders may not be on the same plane |
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Term
| For a "cardiac series", how much do you rotate the pt for an oblique CXR? |
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Definition
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Term
| For AP oblique projections of the chest (LPO/RPO positions), the side of interest is generally the side (closer/farther) away from the IR. |
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Definition
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Term
| For an AP CXR, how can the RT get the scapula out of the lung fields if the pt's condition permits? |
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Definition
| Flex the pt's elbows, pronate the hands, and place the hands on the hips to draw the scapulae laterally |
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Term
| Where does the CR enter for an AP CXR? |
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Definition
| 3" (7.6) cm below the jugular notch |
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Term
| What is another name for the AP axial projection (lordotic position) CXR? |
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Definition
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Term
| Describe how to position a pt for an AP lordotic CXR: |
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Definition
- have pt stand ~ 1 ft in front of the IR
- Adjust the pt so that the coronal plane of the thorax is 15 - 20 degrees from vertical
- The upper margin of the IR should be ~ 3" above the upper border of the pt's shoulders |
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Term
| Where does the CR enter for an AP lordotic CXR? |
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Definition
| at the level of the mid-sternum |
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