Ch 25: Computed Tomography Questions with
Accurate Answers
-beam energy (kVp)
-tube current (mA)
-rotation or exposure time (seconds)
-sectional/slice thickness (collimation)
-object thickness and attenuation (patient size)
-pitch/section spacing
-dose reduction techniques (mA modulation)
-distance from tube to iso-center correct answer factors that directly influence
the CT radiation dose to the patient
-less invasive
-post processing subtraction
-any image can be reconstructed without additional radiation and IV contrast
administration correct answer three advantages of CT angiography (CTA) over
conventional angiography
-maximum intensity projection (MIP)
-shaded surface display (SSD)
-volume rendering (VR) correct answer the three common techniques used for
creating three-dimensional images from CT data are
-radiation dose should be "child size"
-scan only when necessary
, -use shielding whenever possible
-multiple scanning phases are seldom indicated correct answer what should be
considered for CT imaging of pediatric patients
-rotates
-detector assembly
-algorithm; matrix
-liquid crystal display (LCD) or cathode ray tube (CRT) correct answer Basic
scanning steps:
-The xray tube _______ around the patient or part
-A ______ measures the remnant radiation exiting the patient and feeds data to a
computer
-The computer compiles and calculates the data according to a preselected
_______ and assembles it into a ________
-The image is displayed on a _______ or _______
-spatial resolution
-contrast resolution
-quantum noise
-artifacts correct answer four ma image quality
0 correct answer what is the CT number of water?
0.5% correct answer tissue density differences of less than _______ can be
distinguished by CT
Accurate Answers
-beam energy (kVp)
-tube current (mA)
-rotation or exposure time (seconds)
-sectional/slice thickness (collimation)
-object thickness and attenuation (patient size)
-pitch/section spacing
-dose reduction techniques (mA modulation)
-distance from tube to iso-center correct answer factors that directly influence
the CT radiation dose to the patient
-less invasive
-post processing subtraction
-any image can be reconstructed without additional radiation and IV contrast
administration correct answer three advantages of CT angiography (CTA) over
conventional angiography
-maximum intensity projection (MIP)
-shaded surface display (SSD)
-volume rendering (VR) correct answer the three common techniques used for
creating three-dimensional images from CT data are
-radiation dose should be "child size"
-scan only when necessary
, -use shielding whenever possible
-multiple scanning phases are seldom indicated correct answer what should be
considered for CT imaging of pediatric patients
-rotates
-detector assembly
-algorithm; matrix
-liquid crystal display (LCD) or cathode ray tube (CRT) correct answer Basic
scanning steps:
-The xray tube _______ around the patient or part
-A ______ measures the remnant radiation exiting the patient and feeds data to a
computer
-The computer compiles and calculates the data according to a preselected
_______ and assembles it into a ________
-The image is displayed on a _______ or _______
-spatial resolution
-contrast resolution
-quantum noise
-artifacts correct answer four ma image quality
0 correct answer what is the CT number of water?
0.5% correct answer tissue density differences of less than _______ can be
distinguished by CT
