week 4: chest (PA Chest and Left Lateral) Flashcards
what are the 2 forms of digital image receptors?
computed radiography, direct radiography
what is the difference between CR and DR?
Both use an IR, but CR needs to have the IR brought somewhere to be processed
what comprises the bony thorax?
sternum, manubrium, xiphoid process;
2 clavicles, 2 scapulae,
12 pairs of ribs, 12 thoracic vertebrae
palpations at base of neck (posterior) will lead you to this anatomical landmark
C7
Mid-thorax corresponds to
level of T7
Xiphoid process corresponds to
level of T9-T10, even T11 or T12
the anterior rib is (superior/inferior) to the posterior rib
inferior (lower)
the thoracic cavity moves in 3 dimensions on inspiration. what are they?
Vertical diameter
Transverse diameter
AP diameter
A general rule of average adult patients is to “show” minimum of _________ of ribs on a good PA chest
10 pairs
what does SID stand for?
source to image distance
how far away from IR is the bucky to be set?
72 inches
why is 72 inches the correct distance for chest xrays
longer SID magnifies less because the xray beam has less divergence
longer SID magnifies less because the xray beam has (more/less) divergence
less
Chest xrays must be taken on _________
full inspiration
for chest xrays, xray is taken in this way: hold breath on the ________ full inspiration
second
All chest radiographs should be taken in the erect position (as pt condition allows) due to these reasons
- Diaphragm is able to move down farther
- Air and fluid levels in the chest may be visualized
- Engorgement and hyperemia of pulmonary vessels may be prevented
PA Projection
minimum SID
72 inches