Welcome to your CT Scan NAME: EMAIL: [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 . [An MDCT image is reconstructed using a 5122 matrix and a DFOV of 38 cm. If the detector collimation is set to a section width of 1.25 mm, what is the volume of each voxel?] 0.69 mm3 0.93 mm3 1.26 mm3 0.69 mm3 None . [Number 4 on the figure corresponds to which of the following?] descending colon spleen adrenal gland renal vein None Comment . [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 . [Number 3 on the figure corresponds to which of the following? Fig. ] coracoid process acromion glenoid process clavicle None Comment . [The section thickness that would demonstrate the greatest detail of the paranasal sinuses is:] 3 mm 5 mm 7 mm 10 mm None Comment . [Number 3 on the figure corresponds to which of the following?] caudate nucleus thalamus third ventricle pineal gland None Comment . [Number 9 on the figure corresponds to which of the following? Fig.] optic nerve superior ophthalmic vein oculomotor nerve superior oblique muscle None Comment . [Compared with conventional radiography, computed tomography produces diagnostic images with better:] low-contrast resolution spatial resolution minute detail patient radiation dose reduction None . [Vascular components of the brain’s blood supply known as the circle of Willis include the: 1. internal carotid arteries 2. basilar artery 3. anterior communicating artery] 2 only 1 and 2 only 1 and 3 only 1, 2, and 3 None . [The data acquisition system (DAS) of a CT scanner is responsible for: 1. measuring transmitted intensity 2. conversion of the transmission data into a digital signal 3. sending the digital information to the computer for processing] 1 only 2 only 1 and 3 only 1 and 3 only None . [Risk factors for contrast-induced nephrotoxicity (CIN) include: 1. pheochromocytoma 2. allergy to shellfish 3. dehydration] 2 only 3 only 1 and 2 only 1, 2, and 3 None . [The 3D CT technique that includes all of the acquired voxel information in the reconstructed model with adjustments to its opacity is termed:] surface rendering maximum intensity projection (MIP) curved multiplanar deformation volume rendering None . [The image in the figure was most likely displayed with the use of which of the following window widths?] 70 400 1300 3800 None Comment . [The bolus duration of any IV contrast agent administration can be calculated as the product of injection flow rate and:] scan time osmolality cardiac output contrast agent volume None . [Number 6 on the figure corresponds to which of the following?] duodenum terminal ileum appendix pancreas None Comment . [Digital CT images are networked and archived in accordance with a standardized computer protocol identified by which of the following abbreviations?] HIPAA HTTP TCP/IP DICOM None . [Bowel obstruction due to loss of normal contractile motion in an area of intestine is termed:] dyspepsia intussusception ileus adhesion None . [Which of the following technical factors has a direct effect on patient dose?] matrix size algorithm mAs window level 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 . Time's up
