NMTCB CT BOARD UPDATED EXAMS SCRIPT
QUESTIONS AND ANSWERS SURE A+
✔✔typical range for pixel values - ✔✔-1024 HU - +3071 HU
✔✔iterative methods of reconstruction include - ✔✔simultaneous reconstruction
ray-by-ray correction
point-by-point correction
✔✔Fourier Transform is a(n) _______ method of reconstruction - ✔✔analytic
✔✔the approximate inherent filtration of the CT x-ray amounts to the aluminum
equivalent of - ✔✔3 mm
✔✔longitudinal dimension of voxel - ✔✔z-axis
✔✔coronal imaging through the paranasal sinuses is typically performed with the plane
of imaging - ✔✔perpendicular to the hard plate
✔✔absorbed dose unit - ✔✔Gray
✔✔effective dose unit - ✔✔Sievert
✔✔the dose profile is always ______ than the slice sensitivity profile - ✔✔wider
✔✔________ is used in gas ionization chambers - ✔✔xenon
✔✔decreasing quantum noise = _______ in mAs & section width - ✔✔increase
, ✔✔increase in noise increases ______ & _____ but decreases _____ - ✔✔matrix size
& collimation
aperture size
✔✔+1500 - +2000 HU - ✔✔dense bone
✔✔+50 - +65 HU - ✔✔muscle
✔✔+30 - +35 HU - ✔✔blood
✔✔15 HU - ✔✔CSF
✔✔0 HU - ✔✔water
✔✔-50 - -100 HU - ✔✔fat
✔✔-550 - -950 HU - ✔✔lungs
✔✔-1000 HU - ✔✔air
✔✔temperature - ✔✔97.7 - 99.5 degrees Farenheight
✔✔pulse (child) - ✔✔70-120 bpm
✔✔pulse (adult) - ✔✔60-100 bpm
✔✔respiratory rate (child) - ✔✔20-30
✔✔respiratory rate (adult) - ✔✔12-20
✔✔What method of IV contrast agent administrations provides the greatest overall
plasma iodine concentration? - ✔✔bolus technique
✔✔Example of am iso-osmolar contrast media - ✔✔iodixanol (Visipaque)
✔✔Advantages of a saline flush immediately following the IV administration of iodinated
contrast include - ✔✔reduction in required contrast dose
reduction in incidence of CIN
reduction in streaking artifact from dense contrast in vasculature
✔✔Radiation exposure and its potentially harmful effects have a relationship that is
termed _____ in nature - ✔✔stochastic
QUESTIONS AND ANSWERS SURE A+
✔✔typical range for pixel values - ✔✔-1024 HU - +3071 HU
✔✔iterative methods of reconstruction include - ✔✔simultaneous reconstruction
ray-by-ray correction
point-by-point correction
✔✔Fourier Transform is a(n) _______ method of reconstruction - ✔✔analytic
✔✔the approximate inherent filtration of the CT x-ray amounts to the aluminum
equivalent of - ✔✔3 mm
✔✔longitudinal dimension of voxel - ✔✔z-axis
✔✔coronal imaging through the paranasal sinuses is typically performed with the plane
of imaging - ✔✔perpendicular to the hard plate
✔✔absorbed dose unit - ✔✔Gray
✔✔effective dose unit - ✔✔Sievert
✔✔the dose profile is always ______ than the slice sensitivity profile - ✔✔wider
✔✔________ is used in gas ionization chambers - ✔✔xenon
✔✔decreasing quantum noise = _______ in mAs & section width - ✔✔increase
, ✔✔increase in noise increases ______ & _____ but decreases _____ - ✔✔matrix size
& collimation
aperture size
✔✔+1500 - +2000 HU - ✔✔dense bone
✔✔+50 - +65 HU - ✔✔muscle
✔✔+30 - +35 HU - ✔✔blood
✔✔15 HU - ✔✔CSF
✔✔0 HU - ✔✔water
✔✔-50 - -100 HU - ✔✔fat
✔✔-550 - -950 HU - ✔✔lungs
✔✔-1000 HU - ✔✔air
✔✔temperature - ✔✔97.7 - 99.5 degrees Farenheight
✔✔pulse (child) - ✔✔70-120 bpm
✔✔pulse (adult) - ✔✔60-100 bpm
✔✔respiratory rate (child) - ✔✔20-30
✔✔respiratory rate (adult) - ✔✔12-20
✔✔What method of IV contrast agent administrations provides the greatest overall
plasma iodine concentration? - ✔✔bolus technique
✔✔Example of am iso-osmolar contrast media - ✔✔iodixanol (Visipaque)
✔✔Advantages of a saline flush immediately following the IV administration of iodinated
contrast include - ✔✔reduction in required contrast dose
reduction in incidence of CIN
reduction in streaking artifact from dense contrast in vasculature
✔✔Radiation exposure and its potentially harmful effects have a relationship that is
termed _____ in nature - ✔✔stochastic
