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SPECT

Description

CAMRT Nuclear Medicine Technology (Operation of Equipment) Quiz on SPECT, created by Siobhan Pett on 11/05/2020.
Siobhan Pett
Quiz by Siobhan Pett, updated more than 1 year ago
Siobhan Pett
Created by Siobhan Pett almost 5 years ago
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Resource summary

Question 1

Question
Which of the following is most improved with SPECT imaging over planar?
Answer
  • Spatial resolution
  • Sensitivity
  • Contrast resolution
  • Temporal resolution
  • Uniformity

Question 2

Question
A SPECT study is acquired using 60 projections over a 360 degree rotation. Each projection is acquired for 0.5 min. If the counting rate is 144,000 cpm, how many counts will be acquired for the total acquisition?
Answer
  • 1,036,800
  • 2,587,300
  • 3,640,000
  • 3,920,000
  • 4,320,000

Question 3

Question
A nuclear medicine department usually administers 1000 MBq of 99mTc-MDP for an adult bone scan and 10 MBq/kg for a paediatric bone scan. A 3 year old who weighs 14 kg patient is scheduled for a bone SPECT/CT with sedation. What acquisition parameter would be the most useful to adjust for the paediatric scan to improve overall image quality?
Answer
  • Matrix size
  • Zoom factor
  • Time per stop
  • Energy window
  • Detector orbit

Question 4

Question
Computed tomography is commonly employed to provide attenuation correction for SPECT images, but it does result in a higher radiation dose to the patient. Chang's algorithm can provide attenuation correction with no additional dose. Chang's algorithm can reliably provide attenuation correction for which organ/body part?
Answer
  • Brain
  • Heart
  • Lungs
  • Sternum

Question 5

Question
What is the effect of changing the order of a Butterworth filter from 3 to 5?
Answer
  • the image will be smoother
  • the star artifact will be eliminated
  • the image will appear unchanged
  • the image will be sharper
  • the image will be enlarged

Question 6

Question
If a Butterworth filter is applied to an image and the order of the filter remains constant, which of the following cut-off frequencies (the frequency at which the filter magnitude drops below 0.5) will result in the smoothest image?
Answer
  • 0.50 cycles/pixel
  • 0.42 cycles/pixel
  • 0.33 cycles/pixel
  • 0.15 cycles/pixel

Question 7

Question
Which of the following is a high-pass filter?
Answer
  • Ramp
  • Hanning
  • Parzen
  • Newcomer
  • Butterworth

Question 8

Question
What corrections can be incorporated into iterative reconstruction techniques that filtered back projection cannot incorporate?
Answer
  • attenuation correction
  • minimizing motion artifacts
  • non-uniformity corrections
  • noise control

Question 9

Question
Concentric ring artifacts in a reconstructed SPECT image may be caused by:
Answer
  • improper collimation
  • inadequate uniformity
  • correction of large statistical fluctuations in the projection data
  • too few angles of reconstruction
  • too many angles of reconstruction

Question 10

Question
Which of the following is used to evaluate SPECT system performance?
Answer
  • high count flood
  • COR offset measurement
  • PLES phantom
  • Jaszcak phantom
  • 3D or 4D operation

Question 11

Question
A gamma camera has a rectangular FOV that is 50 cm x 35 cm. What is the Nyquist frequency for a 128 x 128 matrix?
Answer
  • 0.16/mm
  • 3.9/mm
  • 0.39/mm
  • 0.26/mm
  • 0.13/mm

Question 12

Question
Which of the following techniques is used to help eliminate the star artifact created during tomographic reconstruction?
Answer
  • filtered backprojection
  • center of rotation offset correction
  • oversampling
  • uniformity correction
  • iterative reconstruction

Question 13

Question
The star artifact in SPECT reconstruction can be reduced by:
Answer
  • increasing the time per projection
  • increasing the number of projections
  • applying a 4D mode acquisition
  • decreasing the number of projections
  • decreasing the time per projection

Question 14

Question
What should the technologist do to improve this image?
Image:
Spect (binary/octet-stream)
Answer
  • Apply a butterworth filter
  • Apply a ramp filter
  • Submit the image for reporting
  • Re-acquire the images

Question 15

Question
What is the purpose of a daily reference scan when using an external radionuclide source for attenuation correction?
Answer
  • To provide the I(0) in the transmission equation
  • To provide the I(x) in the transmission equation
  • To provide the linear attenuation coefficient to be used in the transmission equation
  • To ensure source uniformity using the transmission radionuclide energy windows
  • There is no need to perform a reference scan daily

Question 16

Question
How frequently should a center of rotation (COR) test be performed on SPECT cameras?
Answer
  • weekly
  • daily
  • monthly
  • quarterly
  • hourly

Question 17

Question
The most important purpose of center of rotation offset correction is to:
Answer
  • eliminate the effects of detector tilt in the reconstructed images
  • minimize count sensitivity variations from one area of the crystal to another
  • ensure that all pixels are uniformly sized over the entire field of view
  • align the center of the computer matrix with the mechanical axis of rotation
  • maximize count sensitivity variations from one area of the crystal to another

Question 18

Question
The following center of rotation values were obtained on a SPECT camera. On October 29, the most appropriate action for the technologist is to:
Image:
E5 Q91 (binary/octet-stream)
Answer
  • transfer any SPECT studies to a different computer terminal for processing
  • arrange for camera service
  • acquire SPECT studies using the October 22 value
  • acquire SPECT studies using the October 29 value
  • acquire SPECT studies using the October 1 value

Question 19

Question
Uncorrected flood field non-uniformities cause _____ artifacts in tomographic reconstruction.
Answer
  • irregular
  • dropout
  • ring
  • undulating
  • linear

Question 20

Question
What artifact may result on the image if truncation of transmission images occurs?
Answer
  • Partial volume artifact
  • Ring artifact
  • Star artifact
  • Cupping artifact
  • Motion artifact

Question 21

Question
The collimator being used on a gamma camera in a nuclear medicine department has a dent in it. How can this dent be detected on a sinogram created from tomographic projections?
Answer
  • the dent will appear as a discontinuous wave on the sinogram
  • the dent will appear as a vertical line on the sinogram
  • the dent will appear as a continuous sine wave on the sinogram
  • we cannot detect the dent with a sinogram

Question 22

Question
What is NOT a method to detect a motion artifact on a SPECT/CT image?
Answer
  • check the cine view of the raw SPECT data
  • check the sinogram for a discontinuous wave patter
  • check the summed image
  • visually inspect the reconstructed images
  • check the transmission image for truncation

Question 23

Question
The Jaszczak phantom can be used to evaluate all of the following SPECT imaging characteristics EXCEPT:
Answer
  • Reconstructed uniformity
  • Reconstructed spatial resolution
  • Contrast
  • Sensitivity
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