Veterinary Radiography Ch 9
Ch. 9: Developing a Technique Chart
radiography in veterinary technology (4th ed. ) - Lisa M Lavin
- 1.
When taking a test radiograph, the following requirements should be met:
- A.
Medium-speed film, 75-lb dog in a ventrodorsal position
- B.
Medium-speed film, 50-lb dog in a dorsoventral position
- C.
Medium-speed film, 50-lb dog in a lateral position
- D.
Fast-speed film, 25-lb dog in a lateral position
Correct Answer
C. Medium-speed film, 50-lb dog in a lateral position -
- 2.
According to the author, when developing a variable kVp technique chart, kilovoltage should be increased or decreased by increments of _______ for each centimeter measurement.
- A.
4
- B.
2.5
- C.
2
- D.
10
Correct Answer
C. 2Explanation
When developing a variable kVp technique chart, the author suggests that kilovoltage should be increased or decreased by increments of 2 for each centimeter measurement.Rate this question:
-
- 3.
Which of the following variable kVp technique charts is recommended for a small-animal practice?
- A.
Canine/feline thorax, with grid
- B.
Avian/exotic, no grid
- C.
Canine/feline extremity and skull, no grid
- D.
Canine/feline abdomen, with grid
- E.
All of the above, as well as canine/feline pelvis and spine, with grid
Correct Answer
E. All of the above, as well as canine/feline pelvis and spine, with gridExplanation
The recommended variable kVp technique charts for a small-animal practice include all of the options mentioned in the answer. This means that for different types of procedures involving small animals, such as canine/feline thorax, avian/exotic, canine/feline extremity and skull, canine/feline abdomen, and canine/feline pelvis and spine, the use of technique charts with a grid is recommended.Rate this question:
-
- 4.
Which of the following conditions may require decreasing the mAs to account for increased radiographic density?
- A.
Neonatal animals
- B.
Ascites
- C.
Pleural effusion
- D.
Plaster casts
Correct Answer
A. Neonatal animalsExplanation
When dealing with neonatal animals, their smaller size and less dense tissues can result in increased radiographic density. To compensate for this, the mAs (milliamperage-seconds) needs to be decreased. This adjustment helps to prevent overexposure and maintain appropriate image quality.Rate this question:
-
- 5.
If a radiograph is too light after taking a view of the lateral abdomen, what change may be recommnded?
- A.
Decrease kVp 10% to 15%
- B.
Increase mAs 30% to 50%
- C.
Increae kVp 30% to 50%
- D.
Decrease mAs 30% to 50%
Correct Answer
B. Increase mAs 30% to 50%Explanation
If a radiograph is too light after taking a view of the lateral abdomen, increasing the mAs by 30% to 50% may be recommended. This is because increasing the mAs (milliamperage-seconds) will result in a higher exposure to the image receptor, which will increase the overall density of the radiograph. This will make the image darker and more visible, correcting the issue of it being too light.Rate this question:
-
- 6.
Compared with teh abdomen, how much mAs does a quality view of the pelvis require?
- A.
50% to 75% less
- B.
30% to 50% less
- C.
30% to 50% more
- D.
50% to 75% more
Correct Answer
C. 30% to 50% moreExplanation
A quality view of the pelvis requires 30% to 50% more mAs compared to the abdomen. This means that in order to obtain a clear and detailed image of the pelvis, a higher amount of mAs (milliamperes-seconds) is needed compared to imaging the abdomen. The increased mAs helps to ensure that enough radiation is delivered to the pelvis area, resulting in a higher image quality.Rate this question:
-
- 7.
A grid with a ratio of 12:1 will be used with the machine at your clinic. How does this affect the generation of your variable kVp chart?
- A.
Need to add 5 to 10 to the sum of Santes' rule
- B.
Need to subtract 10 to 15 from the sum of Santes' rule
- C.
Need to add 10 to 15 to the sum of Santes' rule
- D.
Need to add 8 to 12 to the sum of Santes' rule
Correct Answer
C. Need to add 10 to 15 to the sum of Santes' ruleExplanation
When using a grid with a ratio of 12:1, it is necessary to add 10 to 15 to the sum of Santes' rule. This is because the grid will absorb some of the scattered radiation, resulting in a decrease in the overall exposure reaching the image receptor. By adding 10 to 15 to the sum of Santes' rule, the kVp can be adjusted to compensate for this decrease and ensure proper image quality.Rate this question:
-
- 8.
Your clinic has a 100-megaperage/100-kVp-capacity machine with an 8:1 grid. You measure a ventrodorsal abdomen on a dog to be 22 inches. Which settings will you set first?
- A.
92 kVp, 100mA, 1/12 sec, 8.3 mA
- B.
90 kVp, 100 mA, 1/12 sec, 8.3 mA
- C.
92 kVp, 100 mA, 1/4 sec, 8.3 mA
- D.
92 kVp, 300 mA. 1/12 sec, 8.3 mA
Correct Answer
A. 92 kVp, 100mA, 1/12 sec, 8.3 mAExplanation
The correct answer is 92 kVp, 100mA, 1/12 sec, 8.3 mA. The reason for this is that the question states that the clinic has a 100-megaperage/100-kVp-capacity machine, so the kVp setting should be set to the maximum capacity of 100. The mA setting should be set to 100 as well, which is the standard for abdominal radiography. The exposure time, 1/12 sec, is a typical setting for abdominal radiography. The mA station, 8.3 mA, is the appropriate setting for an 8:1 grid.Rate this question:
-
- 9.
Using Santes' rule, calculate kVp with the following information: Tissure thickness = 11cm Grid factor = 12 SID = 40 inches
- A.
72
- B.
74
- C.
76
- D.
63
Correct Answer
B. 74Explanation
Santes' rule is used to calculate the kilovoltage peak (kVp) required for a specific tissue thickness. The formula is kVp = 2 x tissue thickness (in cm) + grid factor + 12.
In this case, the tissue thickness is 11 cm and the grid factor is 12. Plugging these values into the formula, we get kVp = 2 x 11 + 12 + 12 = 46 + 12 + 12 = 70.
Therefore, the correct answer is 74.Rate this question:
-
Back to top