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CT registry review Exam Test Questions and Answers
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CT registry review Exam Test
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CT registry review Exam TestThe X-ray tube converts _______ to ______? - answer Electrical E to EM E
The GENERATOR is a single phase, high frequency. It provides the energy for
_________ __________? - answerX-ray production
Beam shaping filter hardens the beam by? - answer Removing low E photons.
Beam shaping filter hardens the beam by removing low E photons resulting in what two
things? - answer1. Dose reduction 2. Skin sparing
What does the Pre-patient collimator do? - answer Limits the area of the pt that
intercepts the useful beam
What does pre-detector collimator control? - answerBeam width at the detector array by
controlling the volume of the cone beam
Beam width = - answerSlice thickness times the number of detectors utilized
What is analog to digital converter (ADC)? - answerSamples, quantifies, Codes the
electrical E converting it to binary data
Radiation that reaches the detector after being attenuated? - answerSecondary
radiation
DAC (Digital to Analog Converter) - answerConverts the reconstructed binary data back
into electrical E impulses that are recognized by a display device
The ct monitor displays the electrical E impulses as an image of ? - answerIndividual
pixel gray shades representing the image proper
The process of CT image creation can be broken down into what three general
segments? - answer1. Data acquisition 2. Image reconstruction 3. Image display
Data acquisition is provided by? - answerHelical scanner
Image reconstruction is provided by? - answerCt computer aka array processor
Image display is provided by? - answerMonitor
, Radiologic Image = ________ ___________ = ____ ______ - answerRemnant
Radiation = Exit Beam
The detector system functions include the conversion of ____________ __________ to
____________ ________? - answerElectromagnetic energy to electrical energy
Secondary radiation - answerX-radiation that is created when the primary beam
interacts with matter
Where are the electrical impulses sampled? - answerThe ADC
Data in the form of binary digits is exactly what the ct computer (array processor) needs
to reconstruct the binary data into an? - answerOrganized pattern on a matrix according
to the reconstruction algorithm
What three things happen within the ADC? - answer1. Electrical impulses are sampled
(microvolts & picoamps)
2. Samples are quantified
3. The sample is coded
Attenuation data is stored within the? - answerVoxel
Voxel - answerSection of tissue represented by a pixel
Linearity - answerthe relative accuracy between calculated CT numbers and their
respective linear attenuation coefficients
Testing for uniformity is testing for what two things? - answer1. System sensitivity
2. Contrast resolution
Exposure experiment involves what? - answerPhantom exposure and ROI analysis of
five separate ROI areas
List three things for defining noise? - answer1. Scatter
2. Beam Hardening
3. Electronic Fluctuations
List the two main advantages of CT over conventional radiography? - answer1.
Superimposition of structures are minimized
2. The ability to differentiate small differences in density according to their individual
shades of gray is maximized
Ct is __ x better than diagnostic - answer10x
MTF stands for? - answermodulation transfer function
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