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Exam (elaborations)

CT registry review Exam Test Questions and Answers

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  • CT Registry

CT registry review Exam Test

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  • September 19, 2024
  • 12
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • CT registry
  • CT registry
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julianah420
CT registry review Exam Test

The 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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