New Quiz 19 Dec Welcome to your CT Scan NAME: EMAIL: [Which of the following would serve to increase spa- tial resolution of a CT exam using a large focal spot size, 5-mm sections, and a 5122 matrix? 1. change to small focal spot size 2. acquire 2.5-mm sections 3. reconstruct images in a 3202 matrix] 1 only 1 and 2 only 1 and 3 only 1, 2, and 3 None . [Which number on the figure corresponds to the anterior horn of the lateral ventricle?] 1 5 3 2 None Comment . [During CT examination of the larynx, the patient is often instructed to phonate the letter “E” in order to properly evaluate the:] epiglottis uvula trachea epiglottis None . [The information included during the 3D reconstruction of a CT scan is controlled by the:] algorithm window setting threshold setting None . [The graph in the figure is used to evaluate which of the following components of CT image quality? Fig. ] in-plane spatial resolution longitudinal spatial resolution temporal resolution contrast resolution None Comment . [Retrospective ECG gating utilizes which of the following portions of the cardiac cycle for image reconstruction? 1. atrial systole 2. ventricular systole 3. cardiac diastole] 2 only 3 only 1 and 2 only None . [Which of the following technical changes would serve to decrease patient radiation dose during a CT examination?] increase in matrix size change from soft tissue to bone algorithm decrease of tube rotation from 360 to 180 degree decrease in DFOV None . [Number 4 on the figure corresponds to which of the following?] gastric artery inferior vena cava (IVC) superior mesenteric artery (SMA) descending aorta None Comment . [Which of the following archival media is capable of storing the largest number of CT images?] floppy disk magnetic tape VHS tape optical disk None . [During CT x-ray production, the electromagnetic steering of the electron beam from the cathode to two alternating targets is referred to as] prospective gating ultrafast CT twin CAT flying focal spot None . [Which of the following reformation techniques best describes the image in the figure? Use Fig.] Multiplanar reformation (MPR) Volume-rendered 3D Maximum intensity projection (MIP) Minimum intensity projection (min-IP) None Comment . [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 . [An increase in the sampling rate during CT data acquisition corresponds to an increase in:] views per rotation patient radiation dose mage noise None . [Which of the following factors may affect a patient’s calculated glomerular filtration rate (GFR)? 1. age 2. sex 3. race] 1 and 2 only 2 and 3 only 1 and 3 only 1, 2, and 3 None . [Urticaria is which of the following?] severe nausea with associated vomiting urinary tract infection hives bronchospasm None . [Writable CD and DVD media are optical disks that may be described as:] read-only lossy WORM lossless None . [Which of the following sets of section width and spacing would be most suitable for a general survey CT of the neck?] 0.75 mm thick every 0.75 mm 3 mm thick every 5 mm 3 mm thick every 3 mm 10 mm thick every 10 mm 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 . [Which of the following would be best suited for intravenous injection of contrast material with a power injector?] butterfly needle central venous line 23-gauge spinal needle angiocatheter None . [Which of the following terms may be used to describe the quantity of radiation emitted from the CT x-ray tube toward the patient?] effective mAs photon flux constant mAs photon fluence None . Time's up
