Welcome to your CT Scan NAME: EMAIL: [Writable CD and DVD media are optical disks that may be described as:] read-only lossy WORM lossless None . [Number 2 on the figure corresponds to which of the following?] hepatic vein suprarenal lymph node adrenal gland common bile duct None Comment . [Number 3 on the figure corresponds to which of the following? Use Fig.] inferior vena cava common iliac artery abdominal aorta superior mesenteric artery None Comment . [A CT system measures the average linear attenuation coefficient of a voxel of tissue to be 0.008. The linear attenuation coefficient of water for this scanner equals 0.181. The CT number assigned to the pixel representing this voxel of tis- sue equals:] þ 956 HU þ 173 HU þ44 HU þ1044 HU None . [Number 5 on the figure corresponds to which of the following?] right internal jugular vein right external carotid artery right internal carotid artery right external jugular vein None Comment . [Collimation of the CT x-ray beam occurs: 1. at the x-ray tube, regulating slice thickness 2. just beyond the patient, focusing off-axis transmitted radiation 3. before the detectors, limiting the amount of scatter radiation absorbed] 1 only 1 and 2 only 1 and 3 only None . [Which of the following is the most common sign of GI pathology on CT images?] fluid collection wall thickening air distention dense fecal matter None . [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 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 . [Components of the aseptic technique utilized for the IV administration of contrast agents include: 1. thorough hand washing between patients 2. wearing of disposable gloves 3. establishment of a sterile field around the site] 1 and 2 only 1 and 3 only 2 and 3 only 1, 2, and 3 None . [The Lisfranc joint is the articulation between the:] tarsals andmetatarsals tarsals and lower leg metatarsals and phalanges metatarsals and tarsals None . [The epithelial lining of the urinary tract is called the:] omentum haustrum urothelium pyelocalyx None . [Which of the following would serve to reduce the image artifact present in the figure? increase in filtration(2) increase in kVp (3) increase in section width] 1 only 1 and 2 only 1 and 3 only 1, 2, and 3 None Comment . [Percutaneous drainage under CT guidance may be used for the aspiration of which of the following processes] chronic subdural hematoma hydrocephalus abdominal abscess dissecting aortic aneurysm None . [Proper immobilization during a CT procedure may involve the use of: 1. soft, hook-and-loop (e.g., Velcro) immobilization straps 2. adhesive medical tape 3. good patient communication] 1 only 1 and 2 only 1 and 3 only 1, 2, and 3 None . [During a CT examination of a female pelvis for a suspected malignancy, ascites may be present in an area posterior to the uterus and ovaries known as:] the cul-de-sac Morison’s pouch the space of Retzius the prevesical compartment 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 . [Daily air or water calibration of the CT system is performed to evaluate which of the following components of image quality?] contrast resolution temporal resolution uniformity linearity None . [Number 2 on the figure corresponds to which of the following? Fig ] capitate lunate hamate scaphoid None Comment . [The areas of image quality degradation indicated by number 3 on the figure are an example of:] aliasing artifact windmill artifact pulsation artifact beam-hardening artifact None Comment . Time's up
