CT Board Review Questions with Accurate
Answers
correct answer The rate at which a quantity of x-radiation emitted from a CT tube
passes through a unit area over a unit of time is called the:
+1000 HU correct answer An average CT number value for bone is:
0 - +20 Hounsfield units correct answer Simple cysts of the kidney have an
average attenuation value in the range of what?
0.5 MB correct answer A standard CT image reconstructed on a 512^2 matrix has
a digital size of approximately:
0.5-1.5 mg/dL correct answer Average creatine
1 mm correct answer This high-resolution computed tomography (HRCT) image of
the chest was most likely acquired with a section width of:
1.0-3.0mL/sec correct answer During a general CT examination of the abdomen,
an intravenous contrast agent is indicated and is administrated with the aid of an
automatic injector. Which of the following ranges of flow rate should be used?
120/80 (systolic/diastolic) correct answer Average blood pressure
140,000-440,000 ul of blood correct answer Average platelet count
,15 degrees above the infraorbital-metal line (IOML) correct answer During a CT
scanning of the head, the gantry should be angled:
15 degrees correct answer What angle should you insert a butterfly needle at?
16 correct answer A 16-slice MDCT system utilizes an adaptive array of 24
detectors, each ranging in size from 0.625 to 1.25 mm. What is the maximum
number of sections the system can acquire with each rotation of the gantry?
180 degrees correct answer A first-generation CT scanner consists of an x-ray tube
and two detectors that translate across the patient's head while rotating in 1-
degree increments for a total of:
2-3 minutes correct answer How long until the enhancement of contrast agent
typically occurs during the equilibrium phase?
25-35 seconds correct answer After initiation of rapid bolus administration of an
iodinated contrast agent, the arterial phase of hepatic contrast enhancement
occurs at approximately:
25-35 seconds correct answer How long until the enhancement of contrast agent
typically occurs during the arterial phase?
25-35 Seconds correct answer What is the average range for activated partial
thromboplastin time (PTT)?
3 mm correct answer The section thickness that would demonstrate the greatest
detail of the paranasal sinuses is:
, 3.75 mm sections reconstructed every 3.75 mm correct answer Which of the
following acquisitions may be characterized as contiguous?
5-20 minutes correct answer How long until the enhancement of contrast agent
typically occurs during the delayed phase?
60-100 bpm (beats per minute) correct answer Average pulse
60-70 seconds correct answer How long until the enhancement of contrast agent
typically occurs during the portal (hepatic) venous phase?
7-25 mg/dL correct answer Average BUN (blood urea nitrogen
70keV correct answer The average photon energy of the primary beam of a CT
scanner operating at a tube potential of 120 kVp is approximately:
97.7-99.5 (36.5-37.5) correct answer Average temperature
Absorbed Dose correct answer Amount of x-ray energy absorbed in a unit of
mass. Measured in grays (Gy).
Age, Race, and Sex correct answer Which of the following factors may affect a
patient's calculated glomerular filtration rate (GFR)?
Answers
correct answer The rate at which a quantity of x-radiation emitted from a CT tube
passes through a unit area over a unit of time is called the:
+1000 HU correct answer An average CT number value for bone is:
0 - +20 Hounsfield units correct answer Simple cysts of the kidney have an
average attenuation value in the range of what?
0.5 MB correct answer A standard CT image reconstructed on a 512^2 matrix has
a digital size of approximately:
0.5-1.5 mg/dL correct answer Average creatine
1 mm correct answer This high-resolution computed tomography (HRCT) image of
the chest was most likely acquired with a section width of:
1.0-3.0mL/sec correct answer During a general CT examination of the abdomen,
an intravenous contrast agent is indicated and is administrated with the aid of an
automatic injector. Which of the following ranges of flow rate should be used?
120/80 (systolic/diastolic) correct answer Average blood pressure
140,000-440,000 ul of blood correct answer Average platelet count
,15 degrees above the infraorbital-metal line (IOML) correct answer During a CT
scanning of the head, the gantry should be angled:
15 degrees correct answer What angle should you insert a butterfly needle at?
16 correct answer A 16-slice MDCT system utilizes an adaptive array of 24
detectors, each ranging in size from 0.625 to 1.25 mm. What is the maximum
number of sections the system can acquire with each rotation of the gantry?
180 degrees correct answer A first-generation CT scanner consists of an x-ray tube
and two detectors that translate across the patient's head while rotating in 1-
degree increments for a total of:
2-3 minutes correct answer How long until the enhancement of contrast agent
typically occurs during the equilibrium phase?
25-35 seconds correct answer After initiation of rapid bolus administration of an
iodinated contrast agent, the arterial phase of hepatic contrast enhancement
occurs at approximately:
25-35 seconds correct answer How long until the enhancement of contrast agent
typically occurs during the arterial phase?
25-35 Seconds correct answer What is the average range for activated partial
thromboplastin time (PTT)?
3 mm correct answer The section thickness that would demonstrate the greatest
detail of the paranasal sinuses is:
, 3.75 mm sections reconstructed every 3.75 mm correct answer Which of the
following acquisitions may be characterized as contiguous?
5-20 minutes correct answer How long until the enhancement of contrast agent
typically occurs during the delayed phase?
60-100 bpm (beats per minute) correct answer Average pulse
60-70 seconds correct answer How long until the enhancement of contrast agent
typically occurs during the portal (hepatic) venous phase?
7-25 mg/dL correct answer Average BUN (blood urea nitrogen
70keV correct answer The average photon energy of the primary beam of a CT
scanner operating at a tube potential of 120 kVp is approximately:
97.7-99.5 (36.5-37.5) correct answer Average temperature
Absorbed Dose correct answer Amount of x-ray energy absorbed in a unit of
mass. Measured in grays (Gy).
Age, Race, and Sex correct answer Which of the following factors may affect a
patient's calculated glomerular filtration rate (GFR)?
