Ct Physics And Instrumentation

40 Questions  I  By Leclark
CT Physics and Instrumentation

  
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1.  A pixel may be defined as
A.
B.
C.
D.
2.  The mathematical technique that involves the estimation of an unknown value from values on either side of it s known as
A.
B.
C.
D.
3.  Pixels representing tissues with average attenuation coefficients greater than that of water have which of the types of values?
A.
B.
C.
D.
4.  When compared with conventional X-ray, CT produces diagnostic images with improved
A.
B.
C.
D.
5.  IN 1917, the Austrian mathematician _____________ proved that it was possible to reconstruct a three dimensional object from the infinite set of all progections.
A.
B.
C.
D.
6.  Which of the following is not commonly used as a CT scintillation detector
A.
B.
C.
D.
7.  If a ROI is placed on an object of interest and the HU measures +1.9 HU, the material is most likely to be
A.
B.
C.
D.
8.  The average window width range for a abdomen is
A.
B.
C.
D.
9.  What is the average linear attenuation coefficient coefficient for water?
A.
B.
C.
D.
10.  Which of the following it the primary interaction between x-ray photons and tissue during CT examination
A.
B.
C.
D.
11.  Area of the CT image that contain minimal changes in tissue density are electronically represented by
A.
B.
C.
D.
12.  Ring artifacts on the CT image are associated with which of the following tube detector relationship?
A.
B.
C.
D.
13.  In the binary number system, a byte series of ___________ bits of information
A.
B.
C.
D.
14.  An accurate, modern CT scanner is capable of spatial resolution of up to
A.
B.
C.
D.
15.  Which of the following is the best method to reduce respiratory motion of the CT image?
A.
B.
C.
D.
16.  Which of the following statements is correct regarding the radiographic film used to archive CT images1 It is double emulsion film2 It is sensitive to ultraviolet light only3 It may be used in conjunction with multiformat or laser camera
A.
B.
C.
D.
17.  Which of the following reconstruction methods is used by most modern CT scanners
A.
B.
C.
D.
18.  4th generation CT scanners use a ___________ tube-detector configuration
A.
B.
C.
D.
19.  The fluctuation of CT numbers in a image of uniform, homogeneous material is know as
20.  The term beam hardening describes which of the  following physical phenomena
21.  The process by which electrons are produced at the cathode of a CT x-ray tube is know as
A.
B.
C.
D.
22.  Which of the following increases the signal-to-noise ratio of a CT image
A.
B.
C.
D.
23.  A straight line appearing vertically on the scanogram of a fourth generation CT scanner is a artifact most likely caused by
A.
B.
C.
D.
24.  The acronym CTDI is used to describe which of the following
A.
B.
C.
D.
25.  What is the DFOV used for a 320x320 matrix image with a pixel dimension of .75 x .75 mm?
A.
B.
C.
D.
26.  The full width at half maximum of a CT scanner is used to describe
A.
B.
C.
D.
27.  The average photon energy of the primary beam of a CT scanner operating at a tube potential of 120kvp is
A.
B.
C.
D.
28.  Which of the following is not the typical matrix used with a modern CT Scanner
A.
B.
C.
D.
29.  Which of the following statements regarding collimation of the CT x-ray beam is false
A.
B.
C.
D.
30.  Statistical noise appears as ____________ on a CT image
31.  A quality control procedure determines that the low contrast resolution of a CT image is extremely poor. Causes may include1 increased tube output2 increased electronic noise3 decreased PT dose
A.
B.
C.
D.
32.  Where is the High Frequency generator usually located in a modern CT scanner
A.
B.
C.
D.
33.  The information included during the three dimensional reconstruction of a CT scan is controlled by
A.
B.
C.
D.
34.  Which of the following components of the CT image quality may be controlled by the tech1 spatial resolution2 contrast resolution3 noise
A.
B.
C.
D.
35.  The device constructed to house the x-ray tube and data acquisition system for a CT scanner is termed that
A.
B.
C.
D.
36.  Partial volume averaging occurs within a renal cyst during a spiral CT scan of the abdomen. Which of the following technical adjustments could reduce the partial volume effect and provide more accurate CT numbers1 retrospective reconstruction of scan using reduced section thickness2 rescanning of the PT using reduced section thickness3 retrospective reconstruction of the scan using reduced section spacing
A.
B.
C.
D.
37.  A 512x512 consists of how many pixels
A.
B.
C.
D.
38.  The Hounsfield value of a pixel is directly related to which of the following
A.
B.
C.
D.
39.  Which of the CT image archival media is capable of storing he greatest amount of information
40.  The term ___________ describes the ability of a CT scanner to differentiate objects with minimal differences in attenuation coefficients.
A.
B.
C.
D.
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