Part 4 Flashcards
What is the electronic components of a CT system responsible for measuring the transmitted x-radiation absorbed by the detectors?
Data Acquisition System (DAS)
What does DAS stand for?
Data Acquisition System (DAS)
What is the pathway of data transmission from the detectors to the computerized components of the system’s data acquisition system?
Data Channel
What does the number of data channels for a CT system determine?
The maximum number of sections that may be acquired with each gantry rotation
What is the speed at which a computerized storage drive is able to transfer data?
Data Transfer Rate
What is the mathematical image processing technique used to generate blood perfusion maps during CT perfusion studies of the brain?
Deconvolution
What device is responsible for measuring transmitted radiation and converting it into a proportionate electronic signal to be used for image reconstruction?
Detector Array
What is the process of determining section width in the MSCT system as determined by the defined beam width and the number and thickness of detectors utilized for image reconstruction?
Detector Collimation
What is the number, length, and organization of the individual detector elements in an MSCT system?
Detector Configuration
What is the ratio of table feed per gantry rotation to the acquired section width?
Detector Pitch
What definition of pitch is used for helical single-sllice CT (SSCT)?
Detector Pitch
What does SSCT stand for?
Single Slice CT (SSCT)
What portion of the cardiac cycle when the heart is relaxed?
Disastole
What type of pressure reflects the force exhibited on the arterial walls during relaxation of the heart muscle?
Diastolic Pressure
What is the bottom or second number provided during the assessment of blood pressure?
Diastole
What is the acronym for the Digital Imaging and Communications in Medicine stand for the process of recording, storing, and printing, and transmitting medical image data?
DICOM
What is the diameter of the acquired attenuation data displayed across the image matrix?
Display Field of View (DFOV)
What does DFOV stand for?
Display Field of View (DFOV)
What may also be referred to as the zoom factor or target view?
Display Field of View (DFOV)
What is the measurement of dose for an entire series of CT images?
Dose Length Product (DLP)
What does DLP stand for?
Dose Length Product (DLP)
What is equal to the calculated dose per section multiplied by the length of a CT acquisition along the z-axis?
Dose Length Product (DLP)
What is the section of the patient exposed to radiation at the gantry isocenter?
Dose Profile
What is simultaneous acquisition, by an MSCT system, of attenuation data for a single antomic section with two x-ray beams, each having a different energy spectrum?
Dual-Energy CT
Dual energy CT systems rapidly switch between or alternate _______ ___________ during data acquisition, allowing for improved contrast between substances of differing densities.
kVp settings
What CT system consists of two separate x-ray tubes and detector arrays mounted 90 degrees from each other within the gantry, allowing for dual-energy CT acquisition?
Dual-Source CT
