CT registry exam questions with 100% Correct Solutions
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Course
CT Registry
Institution
CT Registry
In CT image creation using a third-generation design a complete set of ray sums is
known as - Answer view
the process of converting the data from the attenuation profile to a matrix is known as -
Answer archiving
the process of applying a filter function to an attenuation profile is known as - ...
CT registry exam questions with 100% Correct
Solutions
In CT image creation using a third-generation design a complete set of ray sums is
known as - Answer view
the process of converting the data from the attenuation profile to a matrix is known as -
Answer archiving
the process of applying a filter function to an attenuation profile is known as - Answer
convolution
increasing the SFOV - Answer increases the number of detector cells collecting data
what is the function of the digital to analog converter - Answer converts the digital
signal from the computer into a n analog signal for the display montior
why is it necessary to convert the digitized data from the reconstruction processor to
shades of gray - Answer so that an image can be displayed on the monitor
what Hounsfield values are in the naturally occurring range - Answer -1000 to 1000
Decreasing the window width in a CT image decreases? - Answer the anatomic diversity
displayed
The window width of a specific CT image is set at 300 and the level is set at 100. How is
a structure with a measurement of 280 HU displayed? - Answer it is white
, If the main tissue of interest is liver, which of the following is the best approximate
window level setting? - Answer 50
on a ct image an ROI is placed within a structure and measured. Its standard deviation is
0. What can be determined about this structure - Answer it is very homogenous
for which application is raw data necessary - Answer to decrease the display field size
a MF of 1.5 is used to enlarge the image data resulting in - Answer an image that is
larger and may allow a more accurate curson placement for measurement
compared with conventional radiographic images, CT localizer images - Answer are of
slightly poorer image quality
Which are key aspects of the axial method of data acquisition - Answer the table
remains stationary while the x-ray tube rotates within the gantry, collecting data
The interscan delay inherent in an axial scan method is caused by which factor - Answer
table movement between data aquistions
the practice of grouping more than one axial scan in a single breath hold is referred to as
- Answer clustering
compared with helical scanning what are the primary disadvantages to the axial method
of scanning - Answer total examination time is longer, data reconstruction is more
limited
what is it called when a patient breathes differently with each data acquisition and
areas of anatomy seem to be misplaced in the z axis - Answer misregistration
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