CT Simulated Exam Images 3

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sully79
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308138
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CT Simulated Exam Images 3
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2015-09-20 22:30:41
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CT Registry Review
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CT Image Review
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  1. 124. On the basis of the information provided on the graph in the figure, which of the following statements is true?
    A. The limiting resolution in section A is less than that in section B.
    B. The effective width of section B is greater than that of section A.
    C. Section B is isotropic in dimension.
    D. The signal-to-noise ratio (SNR) of section A is greater than that of section B.
    B. The effective width of section B is greater than that of section A.

    The section width (slice) for a volumetric acquistion may be graphically displayed as a slice sensitivity profile (SSP). The effective section width is defined as the full-width at half-maximum (FWHM) of the SSP. The full-width at half-maximum is labeled in the figure as C. At this point of the graph, the section width of B is wider than that of A.
    (this multiple choice question has been scrambled)

  2. 147. Which of the following is the common term for the artifact present on the image in the figure?
    A. aliasing
    B. streaking
    C. edge gradient
    D. tube arcing
    B. streaking

    The presence of metal within the patient causes a streak artifact on the image. The artifact occurs when the dense metal absorbs a large amount of the radiation, interfering with the signal produced.
    (this multiple choice question has been scrambled)

  3. 148. Which of the following would be the most common cause of the artifact in the figure?
    A. detector malfunction
    B. beam hardening
    C. metallic dental fillings
    D. partial volume averaging
    C. metallic dental fillings

    Metallic dental fillings often cause a streak artifact during CT examinations of the head.
    (this multiple choice question has been scrambled)

  4. 149. Reduction of the type of artifact seen in the figure on a coronal MDCT view of the sinuses may be accomplished through:
    A. an increase in the mA
    B. a decrease in the kVp
    C. coronal MPR images built from an axial acquisition
    D. a reduction in the scan field of view (SFOV)
    C. coronal MPR images built from an axial acquisition

    An isotropic axial acquisition of the paranasal sinuses from the hard palate superiorly through the frontal sinus avoids artifact from dental fillings while providing excellent multiplanar reformations (MPRs) in any plane. Direct coronal acquisition may not be required because the detail provided by the reformatted images is usually sufficient. This technique also aids in reducing patient radiation dose.
    (this multiple choice question has been scrambled)

  5. 160. The region of interest (ROI) measurement in the figure provides an average density of +1.9 HU. This material is most likely:
    A. tumor
    B. fat
    C. blood
    D. water
    D. water

    Water has a CT number at or near 0. This area in the ROI in the figure most likely represents a hepatic cyst.
    (this multiple choice question has been scrambled)

  6. 161. The material within the ROI measurement in the figure has a linear attenuation coefficient of:
    A. 0.185
    B. 0.530
    C. 0.0007
    D. 0.206
    D. 0.206

    At the range of photon energies employed during most CT examinations, water exhibits an approximate attenuation coefficient value of 0.206.
    (this multiple choice question has been scrambled)

  7. 162. The image in the figure was most likely displayed with the use of which of the following window widths?
    A. 1300
    B. 70
    C. 400
    D. 3800
    C. 400

    The width of a window used to display a CT image of the abdomen should be within the range of 350-600 HU. This range allows for excellent visualization of the soft tissue structures.
    (this multiple choice question has been scrambled)

  8. 34. Number 2 on the figure corresponds to which of the following?
    A. scaphoid
    B. hamate
    C. capitate
    D. lunate
    A. scaphoid
    (this multiple choice question has been scrambled)

  9. 35. The anatomic plane of the image in the figure can be best described as the:
    A. sagittal plane
    B. coronal plane
    C. oblique axial plane
    D. axial plane
    B. coronal plane

    The image in the figure is a multiplanar reformation (MPR) of the wrist in the coronal plane. MPR images are particularly helpful in trauma indications, such as a fracture of the distal radius, labeled number 3 on the figure.
    (this multiple choice question has been scrambled)

  10. 36. Number 1 on the figure corresponds to which of the following?
    A. capitate
    B. hamate
    C. lunate
    D. scaphoid
    A. capitate
    (this multiple choice question has been scrambled)

  11. 37. Number 5 on the figure corresponds to which of the following?
    A. scaphoid
    B. lunate
    C. capitate
    D. hamate
    B. lunate
    (this multiple choice question has been scrambled)

  12. 41. Number 2 the figure corresponds to which of the following?
    A. bladder
    B. left ovary
    C. sigmoid colon
    D. uterus
    B. left ovary
    (this multiple choice question has been scrambled)

  13. 42. Number 4 in the figure corresponds to which of the following?
    A. left ovary
    B. sigmoid colon
    C. bladder
    D. uterus
    D. uterus
    (this multiple choice question has been scrambled)

  14. 43. Number 5 on the figure corresponds to which of the following?
    A. uterus
    B. sigmoid colon
    C. left ovary
    D. bladder
    D. bladder
    (this multiple choice question has been scrambled)

  15. 47. Number 3 on the figure corresponds to which of the following?
    A. vocal cord
    B. piriform sinus
    C. aryepiglottic fold
    D. cricoid cartilage
    A. vocal cord
    (this multiple choice question has been scrambled)

  16. 48. Number 1 on the figure corresponds to which of the following?
    A. vocal cord
    B. piriform sinus
    C. aryepiglottic fold
    D. trachea
    B. piriform sinus
    (this multiple choice question has been scrambled)

  17. 49. Which of the following window settings was most likely used to display the image in the figure?
    A. WL +50, WW 150
    B. WL +400, WW 3000
    C. WL -300, WW 1000
    D. WL -50, WW 50
    C. WL -300, WW 1000

    A wide window setting may be used to properly demonstrate the small soft tissue vocal structures from the surrounding air-filled endolarynx.
    (this multiple choice question has been scrambled)

  18. 50. Number 2 on the figure corresponds to which of the following?
    A. thyroid cartilage
    B. mandible
    C. cricoid cartilage
    D. hyoid bone
    A. thyroid cartilage
    (this multiple choice question has been scrambled)

  19. 54. Number 9 on the figure corresponds to which of the following?
    A. nasal concha
    B. sphenoid sinus
    C. ethmoid sinus
    D. maxillary sinus
    D. maxillary sinus
    (this multiple choice question has been scrambled)

  20. 55. Number 5 on the figure corresponds to which of the following?
    A. oculomotor nerve
    B. optic nerve
    C. superior oblique muscle
    D. superior ophthalmic vein
    D. superior ophthalmic vein
    (this multiple choice question has been scrambled)

  21. 56. Number 4 on the figure corresponds to which of the following?
    A. levator palpebrae superioris muscle
    B. superior ophthalmic vein
    C. superior oblique muscle
    D. superior rectus muscle
    C. superior oblique muscle
    (this multiple choice question has been scrambled)

  22. 57. Number 6 on the figure corresponds to which of the following?
    A. optic nerve
    B. oculomotor nerve
    C. lateral rectus muscle
    D. medial rectus muscle
    C. lateral rectus muscle
    (this multiple choice question has been scrambled)

  23. 61. Number 6 on the figure corresponds to which of the following?
    A. renal pyramid
    B. renal calyx
    C. renal cortex
    D. renal pelvis
    B. renal calyx
    (this multiple choice question has been scrambled)

  24. 62. Which of the following reformation techniques best describes the image in the figure?
    A. minimum intensity projection (min-IP)
    B. multiplanar reformation (MPR)
    C. volume-rendered 3D
    D. maximum intensity projection (MIP)
    D. maximum intensity projection (MIP)

    MIP images display only the maximum pixel value along a ray traced through the object to the viewer's assumed perspective in front of the viewing monitor. Tissue with lower attenuation values are not displayed, leaving high-attenuation structures such as bone and contrast-enhanced soft tissue structures free of superimposition.
    (this multiple choice question has been scrambled)

  25. 63. Number 1 on the figure corresponds to which of the following?
    A. ureterovesical junction (UVJ)
    B. ureteropyramidal junction
    C. ureteropelvic junction (UPJ)
    D. ureterocalyceal junction
    C. ureteropelvic junction (UPJ)
    (this multiple choice question has been scrambled)

  26. 69. NumberĀ 2 on the figure corresponds to which of the following?
    A. lamina
    B. pedicle
    C. transverse process
    D. superior facet
    C. transverse process
    (this multiple choice question has been scrambled)

  27. 70. Number 1 on the figure corresponds to which of the following?
    A. spinal root
    B. superior articular recess
    C. anterior arch
    D. transverse foramen
    D. transverse foramen
    (this multiple choice question has been scrambled)

  28. 71. Number 4 on the figure corresponds to which of the following?
    A. pedicle
    B. lamina
    C. superior facet
    D. transverse process
    B. lamina
    (this multiple choice question has been scrambled)

  29. 75. Number 4 on the figure corresponds to which of the following?
    A. right common iliac artery
    B. left common iliac vein
    C. left common iliac artery
    D. right common iliac artery
    B. left common iliac vein
    (this multiple choice question has been scrambled)

  30. 76. The best method for targeting the sacrum in the figure for detailed examination would be to:
    A. magnify the image 2x
    B. re-scan the patient using a small SFOV
    C. retrospectively reconstruct the image using a small DFOV
    D. decrease the matrix dimension
    C. retrospectively reconstruct the image using a small DFOV

    Portions of the CT image may be enlarged on the display screen by either of two methods. The image may be magnified to offer the viewer a closer, enlarged look at a specific area. A CT image may also be "targeted" through a decrease in the display field of view (DFOV) size. A targeted image places the area of interest over the entire display matrix, providing greater resolution and more detail than a magnified image.
    (this multiple choice question has been scrambled)

  31. 77. Number 5 on the figure corresponds to which of the following?
    A. ureter
    B. right common iliac artery
    C. inferior mesenteric vein
    D. right common iliac vein
    A. ureter
    (this multiple choice question has been scrambled)

  32. 78. Number 1 on the figure corresponds to which of the following?
    A. iliacus muscle
    B. rectus abdominis muscle
    C. gluteus medius muscle
    D. psoas muscle
    B. rectus abdominis muscle
    (this multiple choice question has been scrambled)

  33. 82. Number 1 on the figure corresponds to which of the following?
    A. right pulmonary artery
    B. right subclavian artery
    C. right brachiocephalic artery
    D. right pericardiacophrenic artery
    A. right pulmonary artery
    (this multiple choice question has been scrambled)

  34. 83. Which of the following best describes the type of image displayed in the figure?
    A. coronal minimum intensity projection (min-IP)
    B. direct coronal acquisition
    C. coronal maximum intensity projection (MIP)
    D. coronal multiplanar reformation (MPR)
    C. coronal maximum intensity projection (MIP)

    MIP images are a routine component of CTA examinations of the chest. This CTA of the pulmonary arteries (CTPA) demonstrates the well-opacified pulmonary vasculature in coronal thick-slab format. From the perspective of the viewer, each pixel displays the maximum attenuation value contained within the thickness of the slab.
    (this multiple choice question has been scrambled)

  35. 84. Number 4 on the figure correspondsĀ to which of the following?
    A. superior mesenteric artery (SMA)
    B. gastric artery
    C. inferior vena cava (IVC)
    D. descending aorta
    D. descending aorta
    (this multiple choice question has been scrambled)

  36. 85. The areas of image quality degradation indicated by number 3 on the figure are an example of:
    A. aliasing artifact
    B. windmill artifact
    C. beam-hardening artifact
    D. pulsation artifact
    D. pulsation artifact

    Pulsation artifacts are unique to cardiac imaging and CTA procedures of the mediastinum. They appear as a type of stair-step artifact and result from the diastolic heart motion occuring during relatively long exposure times. Improving the temporal resolution of the scan and ECG gating are methods employed to reduce pulsation artifact.
    (this multiple choice question has been scrambled)

  37. 86. Number 2 on the figure corresponds to which of the following?
    A. superior vena cava
    B. pulmonary trunk
    C. left anterior descending artery
    D. aortic arch
    B. pulmonary trunk
    (this multiple choice question has been scrambled)

  38. 89. Number 4 on the figure corresponds to which of the following?
    A. fourth ventricle
    B. sagittal sinus
    C. quadrigeminal cistern
    D. third ventricle
    A. fourth ventricle
    (this multiple choice question has been scrambled)

  39. 90. Number 2 on the figure corresponds to which of the following?
    A. left anterior cerebral artery
    B. left posterior cerebral artery
    C. left posterior communicating artery
    D. left middle cerebral artery
    D. left middle cerebral artery
    (this multiple choice question has been scrambled)

  40. 91. Number 5 on the figure corresponds to which of the following?
    A. posterior communicating artery
    B. internal carotid artery
    C. anterior communicating artery
    D. basilar artery
    D. basilar artery
    (this multiple choice question has been scrambled)

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