Welcome to your CT Scan NAME: EMAIL: [An average CT number value for bone is:] þ100 HU þ500 HU þ1000 HU þ3000 HU None . [A region of interest (ROI) measurement placed over a portion of a CT image provides which of the following?] distance (mm) diameter (mm) linear attenuation coefficient (m) average CT number (HU) None . [In a single-slice CT (SSCT) system, which of the following technical parameters may be adjusted retrospectively? 1. section width 2. section increment 3. reconstruction algorithm ] 2 only 1 and 2 only 2 and 3 only 1, 2, and 3 None . [Which of the following most likely describes the patient position during the formation of the image in the figure?] supine prone left lateral decubitus right lateral decubitus None Comment . [Segmenting the data acquisition process into sepa- rate components of smaller rotation angles may improve which of the following components of CT image quality?] temporal resolution longitudinal spatial resolution contrast resolution in-plane spatial resolution None . [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 . [Which of the following methods may be employed to reduce the radiation dose to the paediatric patient undergoing CT? 1. reduce mA 2. limit phases of acquisition 3. increase pitch] 1 only 1 and 2 only 1 and 3 only 1, 2, and 3 None . [First-generation CT scanners used a method of data acquisition based on a ________ principle.] multiplanar rotation-only translate-rotate transaxial None . [Which of the following is the common term for the artifact present on the image in the figure?] aliasing streaking edge gradient tube arcing None Comment . [Number 5 on the figure corresponds to which of the following?] posterior communicating artery anterior communicating artery internal carotid artery basilar artery None Comment . [Which of the following laboratory values is the most dependable measure of renal function?] BUN creatinine PT PTT None . [Number 5 on the figure corresponds to which of the following?] right brachiocephalic vein left subclavian artery left brachiocephalic vein brachiocephalic artery None Comment . [The component of the CT scanner responsible for the mathematical calculations of the image recon- struction process is the:] DAS analog-to-digital converter (ADC) digital-to-analog converter (DAC) array processor None . [Matrix size describes which of the following?] aperture size used during data acquisition number of pixels used to display image relationship between the field of view and the algorithm the number of data channels available None . [The mathematical process that allows MDCT images to be reconstructed at any point along the acquired volume is commonly referred to as:] iteration filtered back-projection Fourier reconstruction z-filtering None . [Which of the following terms is used to describe a patient who is having difficulty breathing?] dyslexia dyspnea dysphagia dysphasia None . [Axial CT images of the knee may be acquired in four separate series with gantry angulations of 0, 30, 45, and 60 degrees in order to demonstrate the:] tibial plateau patellofemoral joint medial and lateral menisci patellofemoral joint None . [Which of the following technical factors has a direct effect on patient dose?] matrix size algorithm mAs window level None . [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 . [Number 7 on the figure corresponds to which of the following?] duodenum pancreatic head jejunum gallbladder None Comment . Time's up
