Quiz
CT Quiz 1
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Perguntas do quiz (44)
1What CT artifact occurs when the object being scanned is outside the scan-field-of-view (SFOV)?
- Aout of field
- Bpartial volume averaging
- Ccone beam
- Dmotion
2What is the purpose of the slip-ring technology employed in modern CT scanners?
- Acapacity for continuous acquisition protocols
- Bemploy single data acquisition protocols
- Cincrease tube loading
- Ddecrease temporal resolution
3Which of the following scientist theory states the sampling rate must be at least twice the highest analog frequency component?
- AHounsfield
- BCormack
- CRadon
- DNyquist
4What 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?
- Aanterior cruciate ligament
- Blateral collateral ligament
- Cposterior cruciate ligament
- Dmedial collateral ligament
5Name an advantage of utilizing the Fourier transform for image reconstruction:
- Amanipulation of data in the spatial frequency domain
- Bmanipulation of data in the spatial location domain
- Ccalculating the intensities along the ray sum
- Dcalculating the CT number of the given intensities
6Patients 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?
- A12 hours
- B24 hours
- C48 hours
- Dshould not receive iodinated contrast media
7How should lead shielding (if being utilized) be placed on the patient during a CT examination of the brain?
- Aunder the patient’s body region not being examined
- Bunder and over the patient’s body region not being examined
- Cover the patient’s body region
- Dno need to use shielding for a CT examination
8This figure demonstrates which of the following 3D techniques?
- Amaximum intensity projection (MIP)
- Bminimum intensity projection (MinIP)
- Cvolume rendered (VRT)
- Dmultiplanar reformation (MPR)
9Which dural fold lines the longitudinal fissure?
- Afalx cerebri
- Bfalx cerebelli
- Ctentorium cerebelli
- Dinfundibulum
10A particular CT image has a matrix size of 512^2 and a field-of-view (FOV) of 360 mm, what is the pixel area?
- A0.49 mm^2
- B0.7 mm
- C4.9 mm^2
- D0.7 cm^2
11Which 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?
- Adata acquisition
- Bsampling
- Cprojection reconstruction
- Dbeam geometry
12Which of the following pathological conditions is a major risk factor for stroke and can lead to brain damage?
- Acarotid artery stenosis
- Bsalivary stone obstruction
- Cjugular vein thrombosis
- Dgoiter
13When 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?
- Alossless
- Blossy
- Cirreversible
- Dtruncated
14Which of the following glands are depicted as high-attenuation structures on CT images?
- Athyroid gland
- Bparotid gland
- Csubmandibular gland
- Dsublingual gland
15What 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?
- A0.4:1
- B0.12:1
- C1.2:1
- D1:1
16What is the purpose of performing an unenhanced CT scan of the liver?
- Ato demonstrate hepatocellular carcinoma
- Bto demonstrate hepatomas
- Cto demonstrate cirrhosis
- Dto demonstrate fatty infiltrates
17Which of the following refers to the ability of the CT detector to capture, absorb, and convert x-ray photons into electrical energy?
- Aefficiency
- Bstability
- Cresponse time
- Ddynamic range
18Which of the following is not an advantage of today’s iterative reconstruction algorithm?
- Aincrease in kVp
- Breduces noise
- Creduction in mAs
- Dimproves image quality
19Contrast resolution is superior with CT examinations principally because of what feature?
- Acollimation
- Blow kVp
- Cpost processing
- Dhigh-pass convolution kernel
20Which of the following statements is true concerning the celiac trunk?
- Ait is superior to the renal arteries on the abdominal aorta
- Bit is the only unpaired visceral branch of the aorta
- Cit divides into the gastric, splenic, and mesenteric arteries
- Dit branches from the aorta at the level of L2/L3 vertebral level
21Networking 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?
- AMetropolitan area network (MAN)
- BLocal area network (LAN)
- CWide area network (WAN)
- DWorld wide web (WWW)
22Which of the following is a potential complication from the use of barium sulfate as an oral contrast agent?
- Aleakage
- Bextravasation
- Ccolitis
- Dpancreatitis
23The 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?
- Aautomatic tube current modulation
- Bdual energy scanning
- Chybrid detector array
- Dsubsecond scanning
24Which of the following pathological infections cause damage to the heart valves and valve leakage?
- Acarditis
- Bpneumonia
- Cpulmonary embolism
- Dtuberculosis
25The floor of the third ventricle is formed by what organ of the brain?
- Ahypothalamus
- Bmidbrain
- Cthalamus
- Dcaudate nucleus
26A particular CT image possesses a pixel size of 0.68 mm; what is the DFOV that was used during reconstruction?
- A750mm
- B348mm
- C237mm
- D512mm
27When a CT x-ray beam experiences beam hardening, what happens to the mean photon energy of the beam?
- Aincreases
- Bdecreases
- Cis unaffected
- Dbeam hardening and beam energy are not related
28In what CT scanner does cone beam artifacts occur?
- Athird generation with ≥16 detector channels
- Bfourth generation with ≥16 detector channels
- Cfirst generation
- Dthird generation with single detector
29What CT imaging plane is the most common entity for identifying pars defects?
- Atransaxial
- Bsagittal
- C3D-shaded surface rendering
- Dcoronal
30Which 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?
- Amatrix array
- Bhybrid array
- Cadaptive array
- Dvariable array
31A 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?
- Aair
- Bwater
- Cfat
- Dcalcium
32Which of the following is a characteristic of raw data?
- Ais the unprocessed computer data in the form of binary numbers
- Bcan be sent to a laser printer for hard-copy viewing
- Cundergoes corrections for errors that occurred
- Dknown as scan data
33What is the range of CT numbers if the window width is 2,000 and the window level is 700?
- A1,700 to –300
- B-1,700 to 300
- C−2,300 to 1,650
- D2,300 to -1,650
34Which of the following QA test requires the operator to place 5 ROIs within a homogeneous water phantom?
- Auniformity
- Blinearity
- Ccontrast resolution
- Dbed index
35The Modulation Transfer Function (MTF) can be used to estimate spatial resolution at which of the following frequencies?
- Aat all spatial frequencies
- Bat high spatial frequencies
- Cat low spatial frequencies
- Dby converting an LSF to an ERF
36Which of the following reconstruction algorithms improves the appearance of contrast resolution?
- Asmooth kernel
- Bultra-high kernel
- Cbone kernel
- Dhigh-pass convolution kernel
37Which of the following equations represents SNR?
- Amean ROI÷background ROI
- Bbackground ROI÷mean ROI
- C(mean ROI-background ROI)÷standard deviation
- Dmean ROI×background ROI
- Amean ROI÷background ROI
38Which of the following combinations will produce an image with the best spatial resolution?
- Asmall pixels and thin slice width
- Bsmall pixels and thick slice width
- Clarge pixels and thick slice width
- Dlarge pixels and thin slice width
39Which of the following is located in the retroperitoneal space?
- Aabdominal aorta
- Bliver
- Cspleen
- Dileum
40When 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?
- A2.0–3.0
- B1.0-2.0
- C1.5-1.7
- D3.5-5.0
41Which of the following are recommended by the Center for Devices and Radiological Health as a CT dose descriptor?
- ACTDIvolume
- Bionization chamber measurements
- Cdose profile
- Dprojection profile
42Peritoneal ligaments serve to connect organs with another organ or to the abdominal wall; what is the function of the hepatorenal ligament?
- Aconnects the liver to the kidney
- Bconnects the stomach to the liver
- Cconnects the gall bladder to the hepatic flexure
- Dconnects the stomach to the diaphragm
43Which 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?
- Aright ventricle
- Bright atrium
- Cleft ventricle
- Dleft atrium
44Name the space between the dura mater and arachnoid meningeal layers:
- Asubdural space
- Bepidural space
- Cprearachnoid space
- Dsubarachnoid space
Informações
- Descrição
- ARRT CT Registry Review
- Autor
- Chris Patrick
- Idioma
- English
- Visualizações
- 419
- Histórico
- Criado em 5 nov 2016 · atualizado em 27 dez 2016
- Etiquetas
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