MICC PRACTICE TEST CH.2 Flashcards
__________ is the mathematical process used by single-row detector scanners to reconstruct CT images from raw data.
A. Weighted averaging.
B. Filtered back projection.
C. The Fourier transform.
D. Integration of the area under the curve.
B - Filtered back projection.
MDCT scanners capable of collecting 64 slices in a single rotation do NOT:
A. Perform conventional CT scans.
B. Perform helical CT scans.
C. use filtered back projection as their method of image reconstruction.
D. Perform localizer scans.
C - use filtered back projections as their method of image reconstruction.
The X-ray beam used in CT scanning is __________ the patients tissues.
1. reflected off of.
2. Attenuated by.
3. Generated by.
A. 1 only.
B. 2 only.
C. 3 only.
D. 1, 2, and 3.
B - 2 only.
A retrospective reconstruction, in which the reconstruction field-of-view is varied, uses:
A. A reconstructed image in the sagittal plane.
B. CT raw data.
C. More photons.
D. CT image data.
B - CT raw data.
CTA images come from a __________ scan.
1. Conventional, or serial.
2. Helical.
3. Localizer.
A. 1 only.
B. 2 only.
C. 3 only.
D. 1, 2, and 3.
B - Helical.
The actual attenuation data measured by the detectors from all projections during a scan is contained in CT _________ data.
A. Image.
B. Convolved.
C. Raw.
D. All of the above.
C - Raw.
Using __________ reconstruction filter would decrease the appearance of noise in a CT image.
A. No.
B. a sharp.
C. A smooth.
D. A sharp & smooth.
C - A smooth.
A kernel is a:
A. Component in the X-ray tube.
B. Post-processing filter applied to image data.
C. Type of detector.
D. Filter applied to the CT raw data.
D - filter applied to the CT raw data.
Iterative reconstruction is:
A. A type of image reconstruction method used in CT before multi-row detector scanners became available.
B. A complex cycle of correction calculations applied during image reconstruction in order to reduce noise in the image.
C. A second reconstruction process performed after the initial reconstruction in which a set of modified parameters is used.
D. Typically performed on helical image data, to generate images in orientations other than those that can easily be directly acquired with CT.
B - a complex cycle of correction calculations applied during image reconstruction in order to reduce noise in the image.
From which of the following can the most diagnostic Multiplanar reconstruction be generated?
A. Stacked transverse images from a helical scan.
B. Stacked transverse images from a conventional, serial scan.
C. Stacked localizer images.
D. All of the above.
A - Stacked transverse images from a helical scan.
A pixel is a:
A. Bright artifact on a film.
B. Single 3D volume element within a volume of anatomical data.
C. Single 2D picture element within the image plane.
D. Range of gray levels on a CT image.
C - Single 2D picture element within the image plane.
In a __________, the highest pixel values from a stack of CTA images are projected along many “rays”.
A. SSD.
B. MIP.
C. PR.
D. VR.
B - MIP.
If an image matrix has 360 rows and 360 columns, how many pixels are there in the image?
129,600
Important clinical benefits of iterative reconstruction include:
1. Ability to reduce radiation dose without compromising image quality.
2. No longer needing to perform multi-planar reconstructions.
3. Reduction in noise seen in the image.
A. 1 only.
B. 2 & 3.
C. 1 & 3.
D. 1, 2, and 3.
C - 1 & 3.
Which of the following statements is FALSE regarding 3D SSD?
A. Helical image data is well suited for 3D SSD because there is minimal misregistration or gaps.
B. The volume data, from which the 3D SSD is generated, is created by combining transverse, Sagittal, and coronal reconstructions.
C. The tissue surface may be selected by using a threshold value equal to the tissue’s CT number.
D. Patient motion during the scan is detrimental to the quality of the 3D images.
B.