CT registry exam Study Questions Solved 100% Correct Answers
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Course
CT Registry
Institution
CT Registry
What is the DAC (digital to analog)? - Answer An interface between the digital output
processor and the output display device.
Where is the ADC located? - Answer Between the detectors and the first set of
computers
What is the name of the first set of computers? - Answer Minicomputers-processin...
CT registry exam Study Questions Solved
100% Correct Answers
What is the DAC (digital to analog)? - Answer An interface between the digital output
processor and the output display device.
Where is the ADC located? - Answer Between the detectors and the first set of
computers
What is the name of the first set of computers? - Answer Minicomputers-processing
computers/mid range computers
PACS - Answer Used to digitally acquire medial images from various modalities
DICOM (Digital Imaging and Communications in Medicine) - Answer The industry
standard for transferral of radiologic images and other medical information between
computers
What are the 2 collimators in CT? - Answer Pre patient collimator
Post patient collimator (pre detector collimator)
Pre patient collimator - Answer Connects to the tube and collimates
Main purpose is Controls patient dose
Controls patient dose is by adjusting the slice thickness
What is the main purpose of the pre patient collimator? - Answer Control patient dose
Adjusts slice thickness
,Post patient collimator (pre detector collimator) - Answer Main purpose is image quality
because it cleans up the scatter
Sits on top of detectors - after the patient
Data acquisition - Answer Systematic way information is collected from the patient to
produce a CT image
What are other words that are associated with the first and second generation scanner?
- Answer Slice by slice, axial/sequential, step and shoot, conventional scanning
What are other words that are associated with the third generation scanner? - Answer
Helical, spiral/ continuous and volumetric
What is the first step in data acquisition? - Answer Scanning
Relative Transmission - Answer The intensities of the X-rays at the source will be
different than the intensity of X-rays at the detector
It is relative to the patient
The patient makes the difference
Total number of transmission measurements = - Answer Number of views times number
of X rays in each view
Is a very large number
Attenuation - Answer The reduction of the intensity of the X-ray beam as it passes
through the patient
,Some photons are absorbed and others are scattered.
Attenuation of the beam depends on what? - Answer The atomic number
Electrons per gram of tissue
Tissue density
The radiation energy used
linear attenuation coefficient definition - Answer The amount of X-ray photons that are
being absorbed per centimeter of tissue
The linear attenuation coefficient unit is what? - Answer Per centimeter (cm ^-1)
Lambert Beers Law is what? - Answer Monogenous/homogeneous
Can't be used for X-ray due to X-ray being heterogeneous
Photoelectric effect - Answer Occurs mainly in tissues with a high atomic number, Z
(such as bone and contrast medium) , and occurs minimally in some soft tissues and
substances with lower Z number
Depends on the beam energy
Compton effect - Answer Occurs in soft tissues, and differences in density result in
differences in Compton interactions
NOT greatly dependent on beam energy
What is the second stage in data acquisition? - Answer Data processing
, What is raw data? - Answer Data that has not been manipulated yet
CT number of water - Answer 0
Ct number for bone - Answer +1000
CT number for air - Answer -1000
For the CT scanners of today what is the K the contrast factors for todays scanners is
what? - Answer 1000
What is the third step of data acquisition? - Answer Image display, storage, and
communication
What are the 3 steps of data acquisition? - Answer Scanning
data processing
image display, storage and communication
Window width - Answer Controls the Contrast
Window level - Answer Controls the Brightness
In the center of window width
SFOV (Scan Field of View) - Answer FOV within the scanner
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