Computed Tomography Quiz Test! Trivia
(128).jpg "Computed Tomography Quiz Test! Trivia - Quiz")
Do you know anything about computer tomography? Computed tomography refers to a computerized x-ray imaging procedure. A narrow beam of x-rays is directed at the patient and quickly rotated around the body, producing signals processed by the machine’s computer to create cross-sectional images of the body. Take this quiz and see how much you know about computed tomography.
- 1.What are the advantages of scans of the pituitary taken in the coronal plane?
- A.
IV contrast material is better visualized
- B.
Streak aritfacts are reduced or eliminated
- C.
The PT is more comfortable during scanning
- D.
The PT receives a lower dose of radiation
- 2.Which of the following is true concerning CT studies of the musculoskeletal system?
- A.
IV contrast is never necessary
- B.
A single bone window is adequate for most studies
- C.
When possible, the normal side should be examined, with the two sides placed symmetrically
- D.
Slice thickness is typically 1-2mm and never exceeds 3mm
- 3.A typical presentation of an abcess on an contrast enhanced CT study is
- A.
That the abscess remains entirely unaffected by the contrast material and presents as a low attenuatioin area
- B.
A low attenuation are surrounded by a ring of enhancement
- C.
A high attenuation are because the contrast pools in the abcess, often creating clear fluid levels
- D.
That the following contrast enhancement, the abcess becomes isodense with the surrounding tissue
- 4.When is it essential to perform a precontracted study on the abdomen along with the post-contrast images.
- A.
When the PT has a history of HEP B
- B.
When the contrasted exam is performed by injection at a high flow rate with the use of a mechanical injector and the scans are performed in the spiral mode
- C.
When the entire liver cannot be imaged before equilibrium phase
- D.
When the PT has a history of CHF.
- 5.Enhancement of most brain lesions is due to
- A.
The intrinsic vascularity of the brain
- B.
The high subject contrast inherent in the brain
- C.
The disruption of the blood brain barrier
- D.
Their unique ability to resist IV contrast media
- 6.Pleural effusion can be defined as
- A.
Fluid in the pericardial cavity, between the visceral and parietal pericardia
- B.
An accumulation of serous fluid in the peritoneal cavity
- C.
A local generalized condition in which the body tissue contain an excessive amount of tissue fluid
- D.
The escape of fluid into the thoracic cavity, between the visceral and parietal pleurae
- 7.What technique can be used to improve visualization of the small pituitary lesions?
- A.
IV contrast dose is doubled, and scanning begins 45 minutes after injection
- B.
Scans are performed without an IV contrast medium
- C.
Intrathecal contrast is administrered by lumbar puncture with scanning approximately 1 hour later
- D.
A bolus of IV contrast, followed by rapid sequence scanning
- 8.Which two strategies can reduce the effect of dental filling in a sinus study?
- A.
High mA and short scan time
- B.
Low KVP and high contrast or bone algorithm
- C.
Adjust the angle of the gantry and widen the window with
- D.
Smal focal spot and small display field
- 9.In filming the brain, why is it common practice to use a wider window width through the posterior fossa?
- A.
To reduce the radiation exposure to the PT
- B.
To decrease the pixel size
- C.
To reduce the appearance of beam hardening artifacts
- D.
To compensate for the small focal spot that is used in the posterior fossa
- 10.Which of the following conditions may be visualized in a CT study of the brain
- A.
Glioblastoma
- B.
Krukenberg tumor
- C.
Wilms tumor
- D.
Plasmacytosis
- 11.Which of the following is affected by the slice spacing in the CT study?
- A.
Spatial resolution
- B.
Quantum mottle
- C.
Radiation dose to the PT
- D.
Signal to noise ratio
- 12.What is an advantage of using a spiral scan technique for a thorax study?
- A.
It is less likely to miss small lesions
- B.
Image noise is decreased
- C.
It is not necessary for the PT to hold their breath
- D.
The software that corrects for table motion also eliminates artifacts from PT motion
- 13.What is the name of the pine cone-shaped structure of the brain that can often be seen as calcified in CT images?
- A.
Choroid plexus
- B.
Pineal gland
- C.
Caudate nucleus
- D.
Middle cerebral artery
- 14.What is the normal range of CT attenuation measurements for a non contrasted liver in an adult PT?
- A.
-60 to -20 HU
- B.
0 to 25 HU
- C.
38 to 80 HU
- D.
108 to 143 HU
- 15.What part of the inner ear play a role in the sense of equilibrium?
- A.
Incus
- B.
Epitympanic recess
- C.
Semicircular canals
- D.
Superior sagittal sinus
- 16.By selecting an algorithm, the tech selects
- A.
A mathematical formula for processing data
- B.
The average photon energy of the x-ray beam
- C.
The shades of gray displayed on the image
- D.
The center pixel value in the window width
- 17.What limitation is inherent in using a partial scan to create an image?
- A.
Image noise is always excessive because adequate MAS cannot be achieved
- B.
Scan data cannot be retrospectively segmented
- C.
Longer scan time increases the likelihood of motion artifacts
- D.
Beam hardening artifacts are increased
- 18.The right ventricle sends blood to the
- A.
Right atrium
- B.
Left atrium
- C.
Inferior vena cave
- D.
Lungs
- 19.What organ produces the digestive enzymes protease, lipase, and amylase?
- A.
Gallbladder
- B.
Stomach
- C.
Small bowel
- D.
Pancreas
- 20.An area on a scan has an associated measurment of 900HU, it is most likely to be composed of
- A.
Bone
- B.
Fat
- C.
Water
- D.
Air
- 21.Crohn disease is primarily a disease of the
- A.
Gastrointestinal tract
- B.
Respiratory system
- C.
Lymphatic system
- D.
Intergumentary system
- 22.The area within the gantry for which raw data are acquired is called
- A.
SFOV
- B.
DFOV
- C.
Scannable range
- D.
Gantry aperture
- 23.Another word used to describe a volume element is
- A.
Pixel
- B.
Particle
- C.
Interpolated plane
- D.
Voxel
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