- When scanning a water bath, the resulting value in Hounsfield Units (HU) should be (10/1)
Your answer:
-50
+50
zero
+1000
-1000
- A spiral CT examination is programmed to travel 240mm of the patient anatomy, the final position of the patient couch should be within (10/2)
Your answer:
230-250mm
225-255mm
238-242mm
235-245mm
239-241mm
- When operated in the high resolution mode, a good CT imager will have spatial resolution of approximatly (10/3)
Your answer:
0.5mm
1.0mm
0.1mm
2.0mm
0.2mm
- Computed Tomography image noise is evaluated by the (10/5)
Your answer:
accuracy of Hounsfield Units (HU) for various materials.
accuracy of the area of a region of interest (ROI).
standard deviation of a water bath image.
standard deviation of an air scan.
accuracy of Linear measurement.
- The best way to evaluate noise in a CT image is to scan (10/6)
Your answer:
a star phantom.
a water bath.
the AAPM 5-pin insert.
a line pair phantom.
air.
- Which of the following is likely to result in the highest patient dose? (9/1)
Your answer:
Chest Radiography
portable radiography
CT
intravenous pyleography (IVP)
barium enema
- The adult dosage of contrast media for a CT examination is the range of (9/2)
Your answer:
250-1000ml.
1-15 ml.
150-250ml.
15-50ml.
50-150ml.
- Lowest occupational radiation exposure during a CT examination is (9/5)
Your answer:
at the imaging plane.
at the foot of the patient.
at the head of the patient.
at the operating console group.
in the plane of the gantry.
- Characteristics of conventional ionic contrast include (9/6)
Your answer:
low osmolity.
high osmolity.
extended injection rate.
increased injection volume.
water concentration.
- Which of the following is the approximate patient dose during a CT examination? (9/7)
Your answer:
1000mrad (10 mGy)
25,000mrad (250 mGy)
10,000mrad (100 mGy)
15,000mrad (150 mGy)
5000mrad (50 mGy)