Welcome to your CT Scan NAME: EMAIL: [During the use of CT fluoroscopy for guided interven- tional procedures, which of the following technical considerations may be used to reduce occupational radiation exposure? 1. increased kVp 2. lead shielding 3. use of a needle holder] 2 only 1 and 2 only 1 and 3 only 2 only None . [Which of the following is considered an analytic form of image reconstruction? 1. iterative technique 2. Fourier reconstruction 3. filtered back-projection] 1 only 1 and 2 only 2 and 3 only 1, 2, and 3 None . [During volumetric CT acquisition, the slice sensitivity profile (SSP) graphically represents the:] effective section width dose profile beam width detector collimation None . [For a single-slice CT (SSCT) system, which of the following statements regarding pre-patient collimation is true? 1. An increase in pre-patient collimation increases patient radiation dose. 2. Pre-patient collimation is used to focus radiation through the section of interest. 3. Pre-patient collimation directly controls slice thickness.] 2 only 3 only 1 and 2 only 2 and 3 only None . [The injection rate of an automatic injector is set at 1.5 mL/sec. What is the injection time for a contrast agent volume of 150 mL?] 60 seconds 90 seconds 100 seconds 120 seconds None . [Simple cysts of the kidney have average attenuation values in the range of:] 40 to 0 Hounsfield units 0 to þ20 Hounsfield units 30 to þ50 Hounsfield units above þ60 Hounsfield units None . [Pixels whose average attenuation coefficients are less than the coefficient of water have which of the following types of CT number values?] extremely large high positive negative high contrast None . [Number 2 corresponds to which of the following?] carotid canal incus cochlea vestibule None Comment . [The major disadvantage of the fan- or cone-shaped x-ray beams used in modern CT units in comparison with the “pencil-thin” beams of older units is:] increased transmission measurements greater patient radiation dose decreased transmission measurements excess tube wear None . [The geometric efficiency of a CT detector is influenced primarily by the:] atomic number of the detector material size of the detector element size of the tube filament amount of interspace material between detectors None . [The recommended scan field of view (SFOV) for a CT examination of the cervical spine is:] 9.6 cm 15.0 cm 25.0 cm 50.0 cm None . [Which of the following MDCT examinations may include endobrachial views?] virtual colonoscopy HRCT of the lungs virtual bronchoscopy CTA of the aorta None . [A CT image is displayed in a window with a level of 0 and a width of 500. Which of the following statements is correct?] Pixels with values between 0 HU and 500 HU will appear white. Pixels with values between 250 HU and þ250 HU will be assigned shades of gray. Pixels with values greater than þ500 HU will be black. Pixels with values less than 0 HU will appear white. None . [Which of the following radiation dose indices is a measure of the total radiation exposure for an entire series of CT images? Check powers in options below] CTDI100 dose length product (DLP) CTDIvol multiple scan average dose (MSAD) None . [The benign mass of the eighth cranial nerve known as a vestibular schwannoma may also be termed a(n):] acoustic neuroma hypoglossal adenoma olfactory neuroblastoma optic nerve glioma None . [The use of water as an oral contrast material for CT of the abdomen and/or pelvis has several potential advantages, including: 1. increased palatability and improved patient comfort 2. better demonstration of enhancing bowel wall 3. no interference with 3D applications] 1 only 1 and 2 only 1 and 3 only 1, 2, and 3 None . [Which of the following is NOT commonly used as a CT scintillation detector material?] ceramic rare earth silver halide bismuth germanate cadmium tungstate None . [Which of the following type(s) of oral contrast material could cause peritonitis if leakage from the digestive tract occurs from perforation?] iopamidol (Gastrografin) barium sulfate diatrizoate (Hypaque) effervescent granules None . [In the binary number system, a byte is a series of _______ bits of information.] two four eight sixteen None . [Number 2 on the figure corresponds to which of the following?] left internal jugular vein left external carotid artery left internal carotid artery left external jugular vein None Comment . Time's up
