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Tungsten is used as the target material on the tube's anode b/c it has a atomic number and a melting point. a. low, high b. high, low c. low, low d. high, high - answerd scanner design was the first to acquire four slices in a single rotation. a. second generation b. third generation c. multi-row detector d. continuous rotation - answerc The enormous heat that builds up in the CT tube is caused by the: a. intensity of the x-ray emitted from the tube b. electron beam between the cathode and the anode in the tube c. x-ray filter in the tube which absorbs the lower energy photons before they can enter the patient. d. collision of the electron beam with the tungsten target on the tube anode. - answerd The number of electron that flow from the cathode to the anode in the tube is controlled by the . a. anode target b. collimator c. mA d. kV - answerc The slip ring on continuous rotation CT scanners: 1. prevents the high voltage cable from winding up 2. allows the exam to commence more rapidly 3. eliminates the need for the reversal of the gantry frame rotation. a. 1 only b. 2 only c. 3 only d. 1, 2 & 3 - answerd Which of the following is NOT a part of the CT tube? a. tungsten target b. collimator c. rotating anode d. filament - answerb Which of the following are NOT commonly used on today's commercially available CT scanners? 1. xenon detectors 2. fourth generation scanners 3. continuous rotation a. 1 only b. 1 & 2 c. 1, 2 & 3 - answerb Which system components converts the projection attenuation data into the proper digital form for the array processor? a. detector b. photodiode c. analog to digital converter d. host computer - answerc x-ray photons are produced by a fast moving electron: 1. colliding with an atomic nucleus 2. passing close to an atomic nucleus 3. colliding with an electron within an atom and ejecting it a. 1 only b. 2 only c. 3 only d. 1, 2 & 3 - answerd Which of the following is TRUE regarding solid state detectors? 1. x-ray photons cause the detectors to generate a flash of light 2. they are the detector type used on most CT scanners today 3. they can be used in both third and fourth generation CT systems. a. 1 only b. 2 only c. 3 only d. 1, 2 & 3 - answerd CT is commonly referred to as al of the following names EXCEPT: a. computerized axial tomography b. digital subtraction angiography
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