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RDT 115 - MIDTERMS

Damsel Murakam
10
0
Idinagdag na problema (20/ 20)
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problema 1

pumili

How does the collimation impact the z axis resolution in ct

  • Wider collimation improve z axis resolution
  • Narrower collimation reduces radiation dose
  • Narrower collimation enhances z axis resolution
  • Wider Collimation reduces pitch ratio

problema 2

pumili

Which artifacts prevents in alternating brighter and dark dense?

  • Beam hardening artifact
  • Aliasing artifact
  • Zebra artifact
  • Coupling artifact

problema 3

pumili

What is the term of the overlap image data in helical scanning?

  • Reconstruction interval
  • Pitch ratio
  • Overlapping SFOV
  • Interpolation artifact

problema 4

pumili

Which artifacts results from insufficient x ray photon energy in highly attenuating tissues?

  • Photon starvation artifact
  • Motion artifact
  • Aliasing artifact
  • Ring artifact

problema 5

pumili

What technique is used to minimize artifact cause by respiratory motion?

  • Respiratory Bleeding
  • Interrogative reconstruction
  • Shorter scan times
  • Increase kVp

problema 6

pumili

Which reconstruction of algorithms is correct for photon attenuation in ct imaging?

  • Photon back projection
  • Interrogative reconstruction
  • Maximum intensity projection
  • Surface shaded display

problema 7

pumili

Which ct protocol is most appropriate for detecting pulmonary embolism?

  • Non contrast brain ct
  • Ct angiography
  • Virtual fluoroscopy
  • Low dose chest ct

problema 8

pumili

Which factor most influences linearity of ct numbers?

  • Detector calibration
  • kVp settings
  • Window width
  • Reconstruction algorithm

problema 9

pumili

Which reconstruction technique is used to create volume-rendered 3D image?

  • MIT
  • SSD
  • VRT
  • FBP

problema 10

pumili

Which scan mode allows for continuous data acquisition?

  • Axial mode
  • Spiral mode
  • Multiplanar reformatting
  • 2d projection

problema 11

pumili

What is the term thin layer of lead inside the ct scanner to shield x rays?

  • Collimator lining
  • Radiation shield
  • Lead housing
  • Xray attenuator

problema 12

pumili

How does a scout image assist in ct imaging?

  • Measures HU value of soft tissues
  • Defines scattering and Reduces visibility saddle soft positioning
  • Determining the pitch ratio
  • Generates 3d image film view

problema 13

pumili

What is the role of kvp in ct imaging?

  • Controls the x ray beam
  • Adjustment of scan pitch
  • Radiation of gantry spin
  • Determination of slice interval

problema 14

pumili

Which CT artifact occurs due to under-sampling during rapid rotation?

  • Aliasing
  • photon starvation
  • streak
  • cupping artifacts

problema 15

pumili

Which plane is reconstructed in coronal reformats?

  • Anterior posterior
  • Inferior superior
  • Mediolateral
  • Axial

problema 16

pumili

What is the main function of gray edge filtering in dual energy ct?

  • Reduce scan time
  • Optimize HU values of bone
  • Differentiating between tissues with similar densities
  • Reducing photon starvation artifact

problema 17

pumili

Which parameters is commonly adjusted to reduce noise while rotating image quality?

  • Increase pitch
  • Decrease matrix size
  • Higher snr
  • Decrease scan time

problema 18

pumili

Which technique minimizes metal artifacts in ct?

  • Increasing ma and reducing kvp
  • Using algorithm reconstruction
  • Narrowing of collimation width
  • Increasing pitch to 2 is to 1

problema 19

pumili

What is the effect of using a wide window width in imaging soft tissues?

  • Reduces visibility saddle soft positioning tissue differences
  • Enhances of spatial resolution
  • Minimizes of photon starvation artifact
  • Increases temporal resolution

problema 20

pumili

What is the main goal of the artifact direction algorithm in ct?

  • Enhance of spatial resolution
  • Reduce noise without increasing dose
  • Correct formation motion
  • Eliminate HU value discrepancies
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