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Saturday, February 16, 2013
CT Registry Review - Physics
This is a review for the CT Registry Physics portion. The questions are taken from "Registry Review in CT". Created By mhixson 1520 days ago http://www.proprofs.com/quiz-school/story.php?title=ct-registry-review-physics
Question Excerpt From CT Registry Review - Physics
Q.1)
Partial volume averaging on the CT image may be decreased by:
A.
B.
C.
D.
Q.2)
The loss of anatomic information between contiguous sections due to inconsistent patient breathing is called:
A.
B.
C.
D.
Q.3)
A CT image is formed in part by projecting back all of the attenuation values recorded during data acquisition onto a:
A.
B.
C.
D.
Q.4)
What is the dimension of each pixel in an image with 512 x 512mm matrix and a DFOV equaling 25.6?
A.
B.
C.
D.
Q.5)
First generation CT scanners used a method of data acquisition based on a _______________ principle.
A.
B.
C.
D.
Q.6)
CT numbers are usually provided in the form of:
A.
B.
C.
D.
Q.7)
Which of the following may be used for the archival storage of CT images? 1. magnetic tape 2. VHS tape 3. magnetic optical disk
A.
B.
C.
D.
Q.8)
The reduction in intensity of an x-ray beam as it interacts with matter is termed:
A.
B.
C.
D.
Q.9)
The major disadvantage of the fan shaped x-ray beams used in modern CT units when compared with "pencil thin" beams is:
A.
B.
C.
D.
Q.10)
Which of the following is the most common type of noise found in the CT image?
A.
B.
C.
D.
Q.11)
Scintillation crystals are used exclusively as detectors in __________________ CT scanners?
A.
B.
C.
D.
Q.12)
A first generation CT Scanner consists of an x-ray tube and two detectors that translate across the patients's head while rotating in 1 degree increments for a total of:
A.
B.
C.
D.
Q.13)
Which of the following factors doesn not affect the dimensions of a voxel?
A.
B.
C.
D.
Q.14)
Areas of a CT image that contain abrupt changes in tissue density are electronically represented by which of the following?
A.
B.
C.
D.
Q.15)
The CT "window" controls the _____________ of the CT image?
A.
B.
C.
D.
Q.16)
Which of the following is an analytic form of image reconstruction? 1. iterative technique 2. Fourier reconstruction 3. filtered back-projection
A.
B.
C.
D.
Q.17)
Which of the following archival media is capable of storing the largest number of CT images?
A.
B.
C.
D.
Q.18)
The term used to describe the relation between the linear attenuation coefficients of an object and the calculated CT numbers is:
A.
B.
C.
D.
Q.19)
The component of the CT scanner responsible for the mathematical calculations of the image reconstruction is the:
A.
B.
C.
D.
Q.20)
Which of the following statements regarding retrospective image reconstruction is false?
A.
B.
C.
D.
Q.21)
Which of the following decreases the noise of the CT image?
A.
B.
C.
D.
Q.22)
Increasing the pitch during a spiral CT examination adversely affects the spatial resolution along with which of the following?
A.
B.
C.
D.
Q.23)
Which of the following statements regarding prepatient collimation is true?
1. An increase in prepatient collimation increases Pt dose. 2. Prepatient collimation is used to focus radiation through the section of interest. 3. Prepatient collimation directly controls slice thickness.
A.
B.
C.
D.
Q.24)
When an operator reduces the SFOV for a particular body part, which of the following technical changes occurs?
A.
B.
C.
D.
Q.25)
An average CT number value for blood is:
A.
B.
C.
D.
Q.26)
Which of the following types of gas is commonly used for gas ionization CT detectors?
A.
B.
C.
D.
Q.27)
The mathematical manipulations required during the reconstruction of a CT image are accomplished using a(n):
1. algorithm 2. kernel 3. mathematical filter function
A.
B.
C.
D.
Q.28)
Quality control measurements to test the accuracy of the calibration of the CT scanner should be performed?
A.
B.
C.
D.
Q.29)
Which of the following technical parameters would greatly improve the quality of CT studies requiring multiplanar reformats?
A.
B.
C.
D.
Q.30)
Pixels whose average attenuation coefficients are less than that of water have which of the following types of CT number values?
A.
B.
C.
D.
Q.31)
Which of the following mathematical techniques is used exclusively for image reconstruction with spiral CT scanners?
A.
B.
C.
D.
Q.32)
Which of the following reduces scatter radiation reaching the detectors?
A.
B.
C.
D.
Q.33)
A voxel may be defined as which of the following?
A.
B.
C.
D.
Q.34)
Which of the following would increase spatial resolution of a CT examination using the following parameters: large focal spot size, 10 mm sections, 512 x 512 mm matrix.
1. Change to small focal spot size 2. Perform 5 mm sections 3. Reconstruct images in a 320 x 320 mm matrix
A.
B.
C.
D.
Q.35)
The portion of the primary beam interacting with a single detector is known as a:
A.
B.
C.
D.
Q.36)
A pixel may be defined as:
A.
B.
C.
D.
Q.37)
The mathematical technique that involves the estimation of an unknown value from values on either side of it is known as:
A.
B.
C.
D.
Q.38)
Pixels representing tissues with average attenuation coeffients greater than that of water have which of the following types of values?
A.
B.
C.
D.
Q.39)
When compared with conventional radiography, CT produces diagnostic images with improved:
A.
B.
C.
D.
Q.40)
In 1917, the Austrian mathematian _____________________ proved that it was possible to reconstruct a three-dimentional object fromt he infinite set of all of its projections.
A.
B.
C.
D.
Q.41)
Which of the following is not commonly used as a CT scintillation detector material?
A.
B.
C.
D.
Q.42)
Which of the following is the primary interaction between x-ray photons and tissue during CT examinations?
A.
B.
C.
D.
Q.43)
Areas of a CT image that contain minimal changes in tissue density are llectronically represented by:
A.
B.
C.
D.
Q.44)
Ring artifacts on the CT image are asociated with which of the following tube-detector geometric relationships?
A.
B.
C.
D.
Q.45)
In the binary number system, a byte is a series of ___________ bits of information.
A.
B.
C.
D.
Q.46)
An accurate, modern CT scanner is capable of a spatial resolution of up to:
A.
B.
C.
D.
Q.47)
Which of the following is the best method to reduce respiratory motion on the CT image?
A.
B.
C.
D.
Q.48)
Which of the following statements is correct regarding the radiographic film used to archive CT images? 1. it is a double-emulsion film 2. it is sensitive to UV light only 3. it may be used in conjunction with a multiformat or laser camera
A.
B.
C.
D.
Q.49)
Which of the following reconstruction methods is used by most modern CT Scanners?
A.
B.
C.
D.
Q.50)
Fourth-generation CT scanners use a _________________ tube-detector configuration.
A.
B.
C.
D.
Q.51)
The fluctuation of CT numbers in an image of uniform, homogeneous material is known as:
A.
B.
C.
D.
Q.52)
The term "beam hardening describes which of the following physical phenomena?
A.
B.
C.
D.
Q.53)
The process by which electrons are produced at the cathode of a CT x-ray tube is known as:
A.
B.
C.
D.
Q.54)
Which of the following increases the signal-to-noise ratio of a CT image?
A.
B.
C.
D.
Q.55)
A straight line appearing vertically on the scanogram (pilot) of a fourth-generation CT scanner is an artifact most likely caused by:
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