1. How many days after fertilization will canine fetal skeletons first appear ona
radiograph?
Answer: 42 days
At 42 days after fertilization, calcium is absorbed into the fetal skeletons and makes
them visible on the radiograph.
2. A cystogram is a radiographic study performed to identify the position,shape, and
lesions involving what structure?
Answer: Urinary bladder
A cystogram is a radiograph of the urinary bladder region taken after injection of
positive-contrast medium directly into the bladder via a urinary catheter.
3. Which type of urinary stone is lucent and does not typically show up on a
radiograph?
Answer: Urate
Urate and Cystine are the two types of stones that do not usually show up on
radiographs and require ultrasound or contrast studies to diagnose.
Calcium oxalate and struvite stones are radiodense and usually visible on a
radiograph. Magnesium ammonium phosphate is another name for a struvite stone.
4. During which of the following periods is a human embryo or fetus mostsensitive
to adverse effects from radiation?
Answer: First trimester
The first 3 months of pregnancy are the most important in terms of radiation safety
because the embryo/fetus is most sensitive at this time. This heightened sensitivity is
due to the organogenesis that occurs during the first trimester.
5. Many x-ray machines used in veterinary medicine have a 2-part exposureprocess.
The first step involves depressing a button or pushing a pedal
half-way to prepare the machine for the exposure and then a second button or fully
depressing the pedal to take the exposure.What happens in the x-raymachine when
the first step is started?
Answer: The anode rotates and the filament is heated
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