HESI RADIOGRAPHY EXAM <\/p>\n\n\n\n
How does the central ray (CR) for an anteroposterior (AP) scapula differ
from an AP shoulder x-ray?
a. CR is the same.
b. One inch lower.
c. One inch higher.
d. Same level, medial. – ANSWER- b. One inch lower.
Rationale; The CR for an AP scapula is one inch lower than the CR
for an AP shoulder, or two inches inferior to the coracoid process.
The CR is not the same for these two projections. One inch higher is
at the level of the coracoid process, too high. At the same level, but
medial, will be one inch too high.
Where is the central ray (CR) directed for an anteroposterior (AP)
projection of the lower leg?<\/p>\n\n\n\n
a. At the level of the medial malleolus.
b. Two inches distal to the medial condyle of the tibia.
c. Mid-lower leg.
d. 0.5 inch inferior to patellar apex. – ANSWER- c. Mid-lower leg.
Rationale; An AP projection of the lower leg requires the CR to
enter mid-lower leg. Half an inch inferior to the patellar apex, the
level of the medial malleolus, and two inches distal to the medial
condyle of the tibia are all either too high or too low.
What should the radiographer do if a radiologist’s instructions are
unclear?
a. Question the lead technologist.
b. Perform the exam in the usual way.
c. Read the protocol book.
d. Ask for clarification – ANSWER- d. Ask for clarification<\/p>\n\n\n\n
Rationale; The radiographer should ask for clarification. This will
allow for any miscommunication to be corrected and improve the
patient outcome. The other options are incorrect.
c. The radiographer.
A metallic artifact from an object that can be clearly seen as the patient
is positioned is clearly the responsibility of the radiographer. For those
who would argue that the radiographer is not responsible for caps on
teeth, notice that the head is tipped too far forward. The occipital bone is
not even visualized on this image. This cap need not have obscured the
tip of the odontoid process. No one else is responsible in this case. –
ANSWER- Who is responsible for the metallic artifact seen in the open
mouth odontoid image?
a. The ordering physician.
b. The receptionist.
c. The radiographer.
d. The patient
Which step will reduce digital image noise, assuming no other changes?
a. Longer exposure time.
b. Image magnification.<\/p>\n\n\n\n
c. Decreased kilovolts peak (kVp).
d. Small pixel size. – ANSWER- a. Longer exposure time.
Rationale; A longer exposure time results in a greater amount of
photons reaching the image receptor, which reduces image noise.
Decreased kVp reduces the quantity of x-rays that reach the image
receptor, which increases image noise. A matrix with a large
number of small pixels results in greater image noise due to the
availability of fewer photons per pixel. Magnification of the digital
image does not affect image noise, but it may make what noise is
there more visible.
Which system can store images?
a. Picture archival and communication system (PACS).
b. Hospital information system (HIS).
c. Digital imaging and communication in medicine (DICOM).
d. Radiology information system (RIS). – ANSWER- a. Picture archival
and communication system (PACS).<\/p>\n\n\n\n