Welcome to your CT Scan NAME: EMAIL: [Number 6 on the figure corresponds to which of the following? Use Fig. ] anterior cerebral artery falx cerebri callosal marginal artery middle cerebral artery None Comment . [The most common indication for CT-guided percu- taneous biopsy is the:] identification of foreign bodies quantification of bone mineral density confirmation of a malignancy measurement of tissue perfusion None . [This HRCT image of the chest was most likely acquired with a section width of:] 1 mm 5 mm 7 mm 10 mm None Comment . [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 . [Which of the following intravenous contrast agent administration methods provides the greatest over- all plasma iodine concentration?] drip infusion bolus technique biphasic technique CT portography None . [The continuous gantry rotation required by helical CT acquisition is made possible by the application of:] electromagnetic bushings titanium bearings slip-rings oil-cooled couplings None . [A patient’s blood pressure is measured as 140/70 mm Hg. The number 140 represents:] the pressure within the arterial vessels during contraction of the heart the pressure exerted on the chambers of the heart while it is relaxed the pressure within the arterial vessels while the heart is relaxed the pressure exerted on the chambers of the heart during a contraction None . [An enema is indicated prior to a CT examination of the pelvis to administer positive contrast material into the large bowel. Which of the following dosages would be sufficient to opacify the rectosig- moid region?] 150-250 mL 300-500 mL 500-750 mL 900-1100 mL None . [The image in the figure was most likely displayed in a window with a level of:] þ150 þ 0 þ50 þ400 None Comment . [Number 4 on the figure corresponds to which of the following?] navicular cuboid calcaneus talus None Comment . [The abnormal density located in the posterior portion of the left lung field on the figure has an average attenuation value of þ5.0 Hounsfield units. This density most likely represents:] neumothorax hemothorax atelectasis neumothorax None Comment . [The circle shown on the image in the figure is used to:] magnify a portion of the image localize an area for percutaneous biopsy perform an ROI measurement produce an MPR image None Comment . [Which of the following artifacts is evident on the image in the figure?] blooming aliasing edge gradient effect ring artifact None Comment . [The thick, layered portion of the peritoneum responsible for attaching portions of the intestines to the bowel wall is called the:] Gerota fascia falciform ligament mesentery ligamentum teres None . [Number 4 on the figure corresponds to which of the following muscles? Fig.] pectoralis major pectoralis minor intercostal serratus posterior superior None Comment . [To maintain security and patient privacy when medical images are transmitted across a network, the images may be coded in a form decipherable only by software at the destination location. This process is referred to as:] write-once, read-many (WORM) hypertext transfer protocol (HTTP) teleradiology encryption None . [The bit depth of a digital imaging system defines the number of information bits contained within each] pixel matrix axial image multiplanar reformation (MPR) None . [Which of the following is NOT a portion of the small bowel?] duodenum jejunum ileum cecum None . [A quality control procedure determines that the low- contrast resolution of a CT scanner is extremely poor. Likely causes are: 1. tube arcing 2. increased electronic noise 3. decreased tube output] 1 only 1 and 3 only 2 and 3 only 1, 2, and 3 None . [Which of the following best describes the type of image featured in the figure? Fig.] direct coronal acquisition sagittal MIP coronal MPR oblique sagittal MPR None Comment . Time's up
