TBR-CT - Training From The BACK Of The Room Certified Trainer
TBR-CT - Training from the BACK of the Room Certified Trainer
Exam (elaborations)
CT Basics Questions and Answers Correct
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TBR-CT - Training from the BACK of the Room Certified Trainer
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TBR-CT - Training From The BACK Of The Room Certified Trainer
Exam of 6 pages for the course TBR-CT - Training from the BACK of the Room Certified Trainer at TBR-CT - Training from the BACK of the Room Certified Trainer (CT Basics)
three major pieces of equipment - answer imaging system (gantry and table), computer,
operator's console
Patient table is made of - answered carbon fiber material
two functions of the CT table - answer transport patient and patient safety
what is the weight limit of the CT table - answer450 lbs
what three coordinated define direction - answerx, y, and z axis
the x axis - answer divides patient into left and right (sagittal)
the y axis - answer divides the patient body into anterior and posterior (coronal plane)
the z axis - answer divides the body into superior and inferior parts (axial)
the gap between each multislice CT scan is called - answerz gap
Z gap is determined by - answerthe pitch
if the pitch increases, the z gap - answerincreases and the image quality decreases
the gantry houses the - answerxray tube, detectors, generators, and cooling system
the gantry tilts - answer12-30 degrees
the to major components to the xray tube - answeranode and cathode
cathode contains - answertungsten filaments
anode can be made of - answertungsten, molybdenum, and rhenium
voltage of the generator range between - answer90-140 kVp
generators convert - answerlow voltage alternating current to a high voltage direct
current
detectors recognize the - answerionizing radiation
, ionixing radiation that has passed through the patient, - answercapture the signal then
transport the signal to the digitizer
xrays produce an analog signal---> converted into a digital signal - answerso that the
computer can read then information ----> produce the final CT image
detector geomety - answerrelationship of the tube, beam shape and the detectors
detector efficiency - answerdetermines how accurately the CT image is reproduced
every time
capture efficiency - answerhow efficient the detectors gather the photon
absorption efficiency - answerhow efficiently the photons are captured by the detectors
stability - answermeasurement of how consistently the detectors respond
response time - answerhow fast the detectors record the photons and how quickly they
recover for the next event
dynamic range - answeraccuracy of the detector's response to both high-energy and
low-energy radiation
reproductibility - answerdescribes how consistently the detectors respond to similar
transmitted radiation events
gas ionization detectors - answerconvert the xrays directly into an electrical signal
scintillation detectors - answercrystal phosphor that illuminate, the light energy is
converted into an electric signal
scintillation detectors are more - answersensitive and they need less frequent
calibration than gas-filled detectors
the goal of collimators is to provide - answera consistent beam width, which is defined
by slice thickness
prepatient collimators are located - answeroutside the xray tube where the beam leaves
the tube
single slice CT collimators - answerdefine the thickness of the cross sectional slice
multislice CT image reconstruction - answerrather than prepatient collimation
determines the slice thickness
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