Part 7 Flashcards
What is the assembly that houses the x-ray tube, detectors, and additional data acquisition components of a CT system?
Gantry
Where is the patient positioned during a CT data acquisition?
Within the Gantry
What is the ability of the detector array to absorb and measure the transmitted x-ray intensity incident upon it?
Geometric Efficiency
What is primarily controlled by the physical arrangement of detectors within the array and the amount of interspace material required between adjacent detectors?
Geometric Efficiency
What is an approximation of creatinine clearance or the rate by which creatinine is filtered from the bloodstream?
Glomerular Filtration Rate (GFR)
What does GFR stand for?
Glomerular Filtration Rate (GFR)
GFR is utilized as a measure of renal function with normal ranges for men as:
71 plus + or minus - 14 mL/min/m squared for men
GFR is utilized as a measure of renal function with normal ranges for women as:
60 plus + or minus - 10 mL/min/m squared for women
What is the type of CT acquisition whereby the x-ray tube and patient continuously move during scanning, yielding a data set in the form of a helix?
Helical
What may also be commonly referred to as spiral?
Helical
What is a specific type of streaking beam-hardening artifact that occurs in the posterior fossa of the brain?
Hounsfield Bar
What is the unit of the CT number scale assigned to each pixel to quantify relative attenuation?
Hounsfield Unit
What type of MSCT detector array with narrower detectors positioned midline, flanked by the wider detectors?
Hybrid-Array
What are processing CT attenuation values greater than the values of the surrounding tissue?
Hyperdense
What are the processing CT attenuation values less than the values of the surrounding tissues?
Hypodense
