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Labirinto
Freestyle
RDT 115 - MIDTERMS
Damsel Murakam
10
Idinagdag na tanong (20/ 20)
Payagan ang maling sagot
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Pampublikong quiz

# 1

Multiple Choice

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

# 2

Multiple Choice

Which artifacts prevents in alternating brighter and dark dense?

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

# 3

Multiple Choice

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

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

# 4

Multiple Choice

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

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

# 5

Multiple Choice

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

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

# 6

Multiple Choice

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

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

# 7

Multiple Choice

Which ct protocol is most appropriate for detecting pulmonary embolism?

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

# 8

Multiple Choice

Which factor most influences linearity of ct numbers?

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

# 9

Multiple Choice

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

  • MIT
  • SSD
  • VRT
  • FBP

# 10

Multiple Choice

Which scan mode allows for continuous data acquisition?

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

# 11

Multiple Choice

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

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

# 12

Multiple Choice

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

# 13

Multiple Choice

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

# 14

Multiple Choice

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

  • Aliasing
  • photon starvation
  • streak
  • cupping artifacts

# 15

Multiple Choice

Which plane is reconstructed in coronal reformats?

  • Anterior posterior
  • Inferior superior
  • Mediolateral
  • Axial

# 16

Multiple Choice

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

# 17

Multiple Choice

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

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

# 18

Multiple Choice

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

# 19

Multiple Choice

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

# 20

Multiple Choice

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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