Multislice Computed Tomography Questions
with Accurate Answers
180-Degree LI Algorithm correct answer Calculates a second spiral from the
measured spiral/helical data offset by 180 degrees Improves slice sensitivity
profile (SSP) enhancing image quality
320-Slice Dynamic Volume CT/Clinical applications correct answer Brain CT
perfusion studies CT angiography Cardiopulmonary imaging Pediatric imaging
360-Degree LI Algorithm correct answer Planar slice is interpolated by use of data
points measured 360 degrees apart Algorithm broadens the slice sensitivity
profile (SSP) degrading image quality
Advantages of MSCT correct answer Increase in speed and volume coverage
Improved spatial resolution/Reduction of exposure/accuracy in needle placement
in CT fluoroscopy/Cardiac CT imaging
Anisotropic correct answer Slice thickness is not equal to the pixel size All voxel
dimensions are not equal
Beyond 64-Slice MSCT Scanners: correct answer 4D Imaging
256-slice CT scanner320-slice CT scanner
Characteristics of 256 Slice Beta 4D CT correct answer Large cone beam allowing a
128-mm field of view. 912x256 detector elements each measuring 0.5 mm.
Rotation time of 0.5 seconds per rotation. Uses Feldkamp cone-beam algorithm.
, Clinical applications correct answer two x-ray tubes coupled to two detector
systems that provided a scanner with two DASs
Dedicated to cardiac imaging The design offers excellent temporal resolution
reducing motion artifacts of the beating heart thus making it ideal for coronary
angiography
Collimation of Multislice CT correct answer Beam is collimated by a pre collimator
to fall on the entire multirow detector array Slice thickness determined by beam
width and detector array configuration8-mm beam width falling on a four-row
multi slice detector array produces four slices with a 2-mm slice thickness
Collimation of Single-Slice CT correct answer Designed to ensure a constant beam
width Width of pre-collimator defines the slice thickness8-mm collimation width
falling on a one-dimension detector array produces an 8-mm slice thickness
Computer System correct answer Receives data from the data acquisition system
and the operator. Provide high-speed preprocessing, image reconstruction, and
post processing operations Incorporate iterative reconstruction algorithms
Include the graphics processing units Includes a monitor and data storage device
Cone-Beam Algorithms correct answer Exact algorithms Approximate algorithms
Feldkamp-Davis-Kress (FDK) 3D algorithm Advanced single-slice rebinning (ASSR)
two-dimensional (2D) approximate algorithm
Data Acquisition System correct answer The detector electronics responsible for
digitizing the signals from the detectors before they are sent to the computer for
processing The DAS is coupled to the multirow detector array by switches
Switches can be turned on and off to ensure that the appropriate detector
segments are exposed to x-rays
with Accurate Answers
180-Degree LI Algorithm correct answer Calculates a second spiral from the
measured spiral/helical data offset by 180 degrees Improves slice sensitivity
profile (SSP) enhancing image quality
320-Slice Dynamic Volume CT/Clinical applications correct answer Brain CT
perfusion studies CT angiography Cardiopulmonary imaging Pediatric imaging
360-Degree LI Algorithm correct answer Planar slice is interpolated by use of data
points measured 360 degrees apart Algorithm broadens the slice sensitivity
profile (SSP) degrading image quality
Advantages of MSCT correct answer Increase in speed and volume coverage
Improved spatial resolution/Reduction of exposure/accuracy in needle placement
in CT fluoroscopy/Cardiac CT imaging
Anisotropic correct answer Slice thickness is not equal to the pixel size All voxel
dimensions are not equal
Beyond 64-Slice MSCT Scanners: correct answer 4D Imaging
256-slice CT scanner320-slice CT scanner
Characteristics of 256 Slice Beta 4D CT correct answer Large cone beam allowing a
128-mm field of view. 912x256 detector elements each measuring 0.5 mm.
Rotation time of 0.5 seconds per rotation. Uses Feldkamp cone-beam algorithm.
, Clinical applications correct answer two x-ray tubes coupled to two detector
systems that provided a scanner with two DASs
Dedicated to cardiac imaging The design offers excellent temporal resolution
reducing motion artifacts of the beating heart thus making it ideal for coronary
angiography
Collimation of Multislice CT correct answer Beam is collimated by a pre collimator
to fall on the entire multirow detector array Slice thickness determined by beam
width and detector array configuration8-mm beam width falling on a four-row
multi slice detector array produces four slices with a 2-mm slice thickness
Collimation of Single-Slice CT correct answer Designed to ensure a constant beam
width Width of pre-collimator defines the slice thickness8-mm collimation width
falling on a one-dimension detector array produces an 8-mm slice thickness
Computer System correct answer Receives data from the data acquisition system
and the operator. Provide high-speed preprocessing, image reconstruction, and
post processing operations Incorporate iterative reconstruction algorithms
Include the graphics processing units Includes a monitor and data storage device
Cone-Beam Algorithms correct answer Exact algorithms Approximate algorithms
Feldkamp-Davis-Kress (FDK) 3D algorithm Advanced single-slice rebinning (ASSR)
two-dimensional (2D) approximate algorithm
Data Acquisition System correct answer The detector electronics responsible for
digitizing the signals from the detectors before they are sent to the computer for
processing The DAS is coupled to the multirow detector array by switches
Switches can be turned on and off to ensure that the appropriate detector
segments are exposed to x-rays
