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CT Quiz 1

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ARRT CT Registry Review
Chris Patrick
Quiz by Chris Patrick, updated more than 1 year ago
Chris Patrick
Created by Chris Patrick about 8 years ago
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Resource summary

Question 1

Question
What CT artifact occurs when the object being scanned is outside the scan-field-of-view (SFOV)?
Answer
  • out of field
  • partial volume averaging
  • cone beam
  • motion

Question 2

Question
What is the purpose of the slip-ring technology employed in modern CT scanners?
Answer
  • capacity for continuous acquisition protocols
  • employ single data acquisition protocols
  • increase tube loading
  • decrease temporal resolution

Question 3

Question
Which of the following scientist theory states the sampling rate must be at least twice the highest analog frequency component?
Answer
  • Hounsfield
  • Cormack
  • Radon
  • Nyquist

Question 4

Question
What ligament extends from the anterior part of the tibial spine and attaches to the posterior part of the medial surface of the lateral femoral condyle?
Answer
  • anterior cruciate ligament
  • lateral collateral ligament
  • posterior cruciate ligament
  • medial collateral ligament

Question 5

Question
Name an advantage of utilizing the Fourier transform for image reconstruction:
Answer
  • manipulation of data in the spatial frequency domain
  • manipulation of data in the spatial location domain
  • calculating the intensities along the ray sum
  • calculating the CT number of the given intensities

Question 6

Question
Patients with liver dysfunction or cardiac failure, but have normal renal function, metformin should be discontinued at the time of an examination or procedure using intravenous iodinated contrast media and withheld for how many hours post injection?
Answer
  • 12 hours
  • 24 hours
  • 48 hours
  • should not receive iodinated contrast media

Question 7

Question
How should lead shielding (if being utilized) be placed on the patient during a CT examination of the brain?
Answer
  • under the patient’s body region not being examined
  • under and over the patient’s body region not being examined
  • over the patient’s body region
  • no need to use shielding for a CT examination

Question 8

Question
This figure demonstrates which of the following 3D techniques?
Image:
094b6d66-3dd0-4b8e-91be-593548d10e68 (image/jpeg)
Answer
  • maximum intensity projection (MIP)
  • minimum intensity projection (MinIP)
  • volume rendered (VRT)
  • multiplanar reformation (MPR)

Question 9

Question
Which dural fold lines the longitudinal fissure?
Answer
  • falx cerebri
  • falx cerebelli
  • tentorium cerebelli
  • infundibulum

Question 10

Question
A particular CT image has a matrix size of 512^2 and a field-of-view (FOV) of 360 mm, what is the pixel area?
Answer
  • 0.49 mm^2
  • 0.7 mm
  • 4.9 mm^2
  • 0.7 cm^2

Question 11

Question
Which of the following refers to a method by which the patient is systematically scanned by the x-ray tube and detectors to collect enough information for image reconstruction?
Answer
  • data acquisition
  • sampling
  • projection reconstruction
  • beam geometry

Question 12

Question
Which of the following pathological conditions is a major risk factor for stroke and can lead to brain damage?
Answer
  • carotid artery stenosis
  • salivary stone obstruction
  • jugular vein thrombosis
  • goiter

Question 13

Question
When images are transmitted to a PACS system or other devices, they are encrypted and compressed during transportation for speed and security. What type of compression is required by HIPAA for the transmission of medical data?
Answer
  • lossless
  • lossy
  • irreversible
  • truncated

Question 14

Question
Which of the following glands are depicted as high-attenuation structures on CT images?
Answer
  • thyroid gland
  • parotid gland
  • submandibular gland
  • sublingual gland

Question 15

Question
What is the pitch having a table feed of 15.36, a gantry rotation of 0.3 seconds, and a detector collimation of 128 × 0.3 mm?
Answer
  • 0.4:1
  • 0.12:1
  • 1.2:1
  • 1:1

Question 16

Question
What is the purpose of performing an unenhanced CT scan of the liver?
Answer
  • to demonstrate hepatocellular carcinoma
  • to demonstrate hepatomas
  • to demonstrate cirrhosis
  • to demonstrate fatty infiltrates

Question 17

Question
Which of the following refers to the ability of the CT detector to capture, absorb, and convert x-ray photons into electrical energy?
Answer
  • efficiency
  • stability
  • response time
  • dynamic range

Question 18

Question
Which of the following is not an advantage of today’s iterative reconstruction algorithm?
Answer
  • increase in kVp
  • reduces noise
  • reduction in mAs
  • improves image quality

Question 19

Question
Contrast resolution is superior with CT examinations principally because of what feature?
Answer
  • collimation
  • low kVp
  • post processing
  • high-pass convolution kernel

Question 20

Question
Which of the following statements is true concerning the celiac trunk?
Answer
  • it is superior to the renal arteries on the abdominal aorta
  • it is the only unpaired visceral branch of the aorta
  • it divides into the gastric, splenic, and mesenteric arteries
  • it branches from the aorta at the level of L2/L3 vertebral level

Question 21

Question
Networking or connectivity became an essential aspect when radiology departments were urged to become filmless. Which of the following area networks covers an area of a few city blocks to the area of an entire city?
Answer
  • Metropolitan area network (MAN)
  • Local area network (LAN)
  • Wide area network (WAN)
  • World wide web (WWW)

Question 22

Question
Which of the following is a potential complication from the use of barium sulfate as an oral contrast agent?
Answer
  • leakage
  • extravasation
  • colitis
  • pancreatitis

Question 23

Question
The primary vendors of CT systems all have systems available which will reduce radiation dose. Which of the following is a commonplace technique that optimizes the dose to the patient while maintaining constant image quality?
Answer
  • automatic tube current modulation
  • dual energy scanning
  • hybrid detector array
  • subsecond scanning

Question 24

Question
Which of the following pathological infections cause damage to the heart valves and valve leakage?
Answer
  • carditis
  • pneumonia
  • pulmonary embolism
  • tuberculosis

Question 25

Question
The floor of the third ventricle is formed by what organ of the brain?
Answer
  • hypothalamus
  • midbrain
  • thalamus
  • caudate nucleus

Question 26

Question
A particular CT image possesses a pixel size of 0.68 mm; what is the DFOV that was used during reconstruction?
Answer
  • 750mm
  • 348mm
  • 237mm
  • 512mm

Question 27

Question
When a CT x-ray beam experiences beam hardening, what happens to the mean photon energy of the beam?
Answer
  • increases
  • decreases
  • is unaffected
  • beam hardening and beam energy are not related

Question 28

Question
In what CT scanner does cone beam artifacts occur?
Answer
  • third generation with ≥16 detector channels
  • fourth generation with ≥16 detector channels
  • first generation
  • third generation with single detector

Question 29

Question
What CT imaging plane is the most common entity for identifying pars defects?
Answer
  • transaxial
  • sagittal
  • 3D-shaded surface rendering
  • coronal

Question 30

Question
Which of the following detector array systems ­consist of several solid-state small detectors of the same dimension that are arranged in rows of ­identical thickness?
Answer
  • matrix array
  • hybrid array
  • adaptive array
  • variable array

Question 31

Question
A CT water phantom was scanned and the linear attenuation coefficient of a particular pixel on the image measured 0.0004; what does this coefficient represent in terms of structures?
Answer
  • air
  • water
  • fat
  • calcium

Question 32

Question
Which of the following is a characteristic of raw data?
Answer
  • is the unprocessed computer data in the form of binary numbers
  • can be sent to a laser printer for hard-copy viewing
  • undergoes corrections for errors that occurred
  • known as scan data

Question 33

Question
What is the range of CT numbers if the window width is 2,000 and the window level is 700?
Answer
  • 1,700 to –300
  • -1,700 to 300
  • −2,300 to 1,650
  • 2,300 to -1,650

Question 34

Question
Which of the following QA test requires the operator to place 5 ROIs within a homogeneous water phantom?
Answer
  • uniformity
  • linearity
  • contrast resolution
  • bed index

Question 35

Question
The Modulation Transfer Function (MTF) can be used to estimate spatial resolution at which of the following frequencies?
Answer
  • at all spatial frequencies
  • at high spatial frequencies
  • at low spatial frequencies
  • by converting an LSF to an ERF

Question 36

Question
Which of the following reconstruction algorithms improves the appearance of contrast resolution?
Answer
  • smooth kernel
  • ultra-high kernel
  • bone kernel
  • high-pass convolution kernel

Question 37

Question
Which of the following equations represents SNR?
Answer

Question 38

Question
Which of the following combinations will produce an image with the best spatial resolution?
Answer
  • small pixels and thin slice width
  • small pixels and thick slice width
  • large pixels and thick slice width
  • large pixels and thin slice width

Question 39

Question
Which of the following is located in the retroperitoneal space?
Answer
  • abdominal aorta
  • liver
  • spleen
  • ileum

Question 40

Question
When ­performing an invasive procedure, it is imperative to check the patient’s INR results. Which of the ­following INR ratios is appropriate for a patient on anticoagulant medication?
Answer
  • 2.0–3.0
  • 1.0-2.0
  • 1.5-1.7
  • 3.5-5.0

Question 41

Question
Which of the following are recommended by the Center for Devices and Radiological Health as a CT dose descriptor?
Answer
  • CTDIvolume
  • ionization chamber measurements
  • dose profile
  • projection profile

Question 42

Question
Peritoneal ligaments serve to connect organs with another organ or to the abdominal wall; what is the function of the hepatorenal ligament?
Answer
  • connects the liver to the kidney
  • connects the stomach to the liver
  • connects the gall bladder to the hepatic flexure
  • connects the stomach to the diaphragm

Question 43

Question
Which chamber of the heart comprises the largest portion of the anterior surface of the chest and receives deoxygenated blood from the right atrium and forces it into the pulmonary trunk for transportation to the lungs?
Answer
  • right ventricle
  • right atrium
  • left ventricle
  • left atrium

Question 44

Question
Name the space between the dura mater and arachnoid meningeal layers:
Answer
  • subdural space
  • epidural space
  • prearachnoid space
  • subarachnoid space
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