CT Basics || 100% Actual Solutions.
three major pieces of equipment correct answers imaging system (gantry and table), computer,
operator's console
Patient table is made of correct answers a carbon fiber material
two functions of the CT table correct answers transport patient and patient safety
what is the weight limit of the CT table correct answers 450 lbs
what three coordinated define direction correct answers x, y, and z axis
the x axis correct answers divides patient into left and right (sagittal)
the y axis correct answers divides the patient body into anterior and posterior (coronal plane)
the z axis correct answers divides the body into superior and inferior parts (axial)
the gap between each multislice CT scan is called correct answers z gap
Z gap is determined by correct answers the pitch
if the pitch increases, the z gap correct answers increases and the image quality decreases
the gantry houses the correct answers xray tube, detectors, generators, and cooling system
the gantry tilts correct answers 12-30 degrees
the to major components to the xray tube correct answers anode and cathode
cathode contains correct answers tungsten filaments
anode can be made of correct answers tungsten, molybdenum, and rhenium
voltage of the generator range between correct answers 90-140 kVp
generators convert correct answers low voltage alternating current to a high voltage direct
current
detectors recognize the correct answers ionizing radiation
ionixing radiation that has passed through the patient, correct answers capture the signal then
transport the signal to the digitizer
, xrays produce an analog signal---> converted into a digital signal correct answers so that the
computer can read then information ----> produce the final CT image
detector geomety correct answers relationship of the tube, beam shape and the detectors
detector efficiency correct answers determines how accurately the CT image is reproduced every
time
capture efficiency correct answers how efficient the detectors gather the photon
absorption efficiency correct answers how efficiently the photons are captured by the detectors
stability correct answers measurement of how consistently the detectors respond
response time correct answers how fast the detectors record the photons and how quickly they
recover for the next event
dynamic range correct answers accuracy of the detector's response to both high-energy and low-
energy radiation
reproductibility correct answers describes how consistently the detectors respond to similar
transmitted radiation events
gas ionization detectors correct answers convert the xrays directly into an electrical signal
scintillation detectors correct answers crystal phosphor that illuminate, the light energy is
converted into an electric signal
scintillation detectors are more correct answers sensitive and they need less frequent calibration
than gas-filled detectors
the goal of collimators is to provide correct answers a consistent beam width, which is defined
by slice thickness
prepatient collimators are located correct answers outside the xray tube where the beam leaves
the tube
single slice CT collimators correct answers define the thickness of the cross sectional slice
multislice CT image reconstruction correct answers rather than prepatient collimation determines
the slice thickness
post patient collimators are correct answers positioned just above the detector array and are also
referred to as predector collimators
post patient collimators improve correct answers image quality and axial resolution
three major pieces of equipment correct answers imaging system (gantry and table), computer,
operator's console
Patient table is made of correct answers a carbon fiber material
two functions of the CT table correct answers transport patient and patient safety
what is the weight limit of the CT table correct answers 450 lbs
what three coordinated define direction correct answers x, y, and z axis
the x axis correct answers divides patient into left and right (sagittal)
the y axis correct answers divides the patient body into anterior and posterior (coronal plane)
the z axis correct answers divides the body into superior and inferior parts (axial)
the gap between each multislice CT scan is called correct answers z gap
Z gap is determined by correct answers the pitch
if the pitch increases, the z gap correct answers increases and the image quality decreases
the gantry houses the correct answers xray tube, detectors, generators, and cooling system
the gantry tilts correct answers 12-30 degrees
the to major components to the xray tube correct answers anode and cathode
cathode contains correct answers tungsten filaments
anode can be made of correct answers tungsten, molybdenum, and rhenium
voltage of the generator range between correct answers 90-140 kVp
generators convert correct answers low voltage alternating current to a high voltage direct
current
detectors recognize the correct answers ionizing radiation
ionixing radiation that has passed through the patient, correct answers capture the signal then
transport the signal to the digitizer
, xrays produce an analog signal---> converted into a digital signal correct answers so that the
computer can read then information ----> produce the final CT image
detector geomety correct answers relationship of the tube, beam shape and the detectors
detector efficiency correct answers determines how accurately the CT image is reproduced every
time
capture efficiency correct answers how efficient the detectors gather the photon
absorption efficiency correct answers how efficiently the photons are captured by the detectors
stability correct answers measurement of how consistently the detectors respond
response time correct answers how fast the detectors record the photons and how quickly they
recover for the next event
dynamic range correct answers accuracy of the detector's response to both high-energy and low-
energy radiation
reproductibility correct answers describes how consistently the detectors respond to similar
transmitted radiation events
gas ionization detectors correct answers convert the xrays directly into an electrical signal
scintillation detectors correct answers crystal phosphor that illuminate, the light energy is
converted into an electric signal
scintillation detectors are more correct answers sensitive and they need less frequent calibration
than gas-filled detectors
the goal of collimators is to provide correct answers a consistent beam width, which is defined
by slice thickness
prepatient collimators are located correct answers outside the xray tube where the beam leaves
the tube
single slice CT collimators correct answers define the thickness of the cross sectional slice
multislice CT image reconstruction correct answers rather than prepatient collimation determines
the slice thickness
post patient collimators are correct answers positioned just above the detector array and are also
referred to as predector collimators
post patient collimators improve correct answers image quality and axial resolution
