PET Imaging: Questions and Answers on Nuclear Medicine Technologist Exam

NECR depends on the true, random and scatter coincidence rates at varying activity concentration levels

Question 1 
1 out of 1 points NECR depends on the:  the true, random and scatter coincidence rates at varying activity concentration levels.            
 

Question 2 
1 out of 1 points To see the same area of a 3D image matrix in all three orthogonal planes, a computer technique called _______ is used. dynamic triangulation            
 

Question 3 
1 out of 1 points When using CT attenuation correction for PET images, the following is NOT required

        
  Question 4

  2 out of 2 points When using a 185 µCi source of 99mTc to check uniformity, a technologist measures the counts in one minute 67,136. If the background in the room is 332 cpm, what is the sensitivity of the system?   

            
  Question 5 
  1 out of 1 points The process of calibrating a scintillation detector involves adjustment of the: high voltage applied to the dynodes of the PMT

            
  Question 6 
 0 out of 1 points Which is not found in the delayed-coincidence window? True events are not found here because of the delay pg 218

            
  Question 7 
 0 out of 1 points In PET imaging, the main purpose of transmission scan is? 

            
  Question 8 
 0 out of 1 points Cross calibration with a dose calibrator or well counter should be performed after a major service as well as? i believe this is     quarterly
 

Question 9 
1 out of 1 points Which of the following is acquired while a transmission source is rotated throughout the field-of-view of a PET scanner without a patient or phantom being present?        
             
  Question 10 
1 out of 1 points Occurs when one of the two annihilation photons is absorbed in a detector, while the other is not; no coincidence is detected.  
                
  Question 11 
1 out of 1 points  The prompt sinogram generated during the PET acquisition must be corrected for the following EXCEPT: prompt events INCLUDE trues, randoms, and scatters

            
  Question 12
1 out of 1 points Line of response 

            
  Question 13 
1 out of 1 points In a PET scanner, the determination of the annihilation event is made possible by    
             
  Question 14 
1 out of 1 points Which of the following PET photon-detector interactions occurs when two photons strike the opposite detectors within a coincidence timing window

Dynamic triangulation is used to see the same area of a 3D image matrix in all three orthogonal planes

            
  Question 15 
1 out of 1 points How many PM tubes are usuallu attached to a block of crystal in the crystal block PET unit.

  
  Question 16 
1 out of 1 points A 3D mode of acquisition is used when the septa are: Objects smaller (less than twice the system FWHM) will appear larger and less intense than they truly are

            
  Question 17 
0 out of 1 points The partial volume effect in PET imaging ______ the size of a small object that is imaged and increases the contrast Objects smaller (less than twice the system FWHM) will appear larger and less intense than they truly are            
 

Question 18 
1 out of 1 points A transmission scan refers to

            
  Question 19 
0 out of 1 points Dedicated PET scanners use __Nal____ for detectors        
              
  Question 20 
2 out of 2 points A wipe test gives a reading or 1,763 cpm with a background count of 307 cpm. If the efficiency of the instrument is 35%, what is the wipe test reading in dpm? 
    

  Question 21 
1 out of 1 points The energy released as a result of an annihilation reaction is in the form of?       
    

 Question 22 
3 out of 5 points Match the following instruments with its best use Question Converts scintillation photons to electrons Amplifies and shapes electronic pulse Identifies pulses within the energy window Counts accepted pulses and tracks time Amplifies electronic signal from the PMT anode

            
  Question 23 
0 out of 1 points A sinogram in PET represents: sinogram represents the raw data. It is a plot of counts/sec that are registered in each LOR

         
  Question 24 
1 out of 1 points Which of the following CANNOT be used for PET scanning?        
    

  Question 25 
0 out of 2 points A technologist has set a 15% symmetric window for a 140 keV photopeak. What will happen to a 158 keV signal?         
              
  Question 26 
0 out of 1 points What part of a PET scanner quality control regimen is necessary for the computation of attenuation factors? blank scan b
            
  Question 27 
1 out of 1 points Occurs when both annihilation photons from one annihilation interact in detectors, without any scatter interactions in the object being imaged. 

            
  Question 28 
1 out of 1 points  Which of the following describes random coincidence?

            
  Question 29 
0 out of 1 points Scintillation crystals for PET scanners are NOT made of

              
  Question 30 
1 out of 1 points When a high activity of a radionuclide is used for a PET scan, image quality is degraded because:

             
  Question 31 
0 out of 1 points  Which of the following is a primary source of radiation exposure to the technologist who performs PET imaging?