Quiz: Positron Emission Tomography A multiple-choice quiz consists of: 10 QuestionsQuestions are selected randomly from a collection of 17 questions. More Questions You will get deferent questions every time you take the quiz. Correct AnswersThere could be more than one correct answer, select all that apply.Skip QuestionsYou are allowed to scroll backward and forward before submitting your answers.10 MinutesThe quiz has a time limit. Time's up You can still submit your answers after the allowed period of time has ended . When ready, click Next to start the quiz. Name (Required) Email (Optional) Twitter (Optional) 1. All of the following scintigraphic methods are often used in the diagnosis of fever of unknown origin (FUO) EXCEPT: Labeled erythrocytes scintigraphy Fluorodeoxyglucose-positron emission tomography (FDG-PET) Labeled leukocytes scintigraphy Ga-67 citrate scintigraphy 2. Before FDG administration, the patient relaxes in a waiting room to minimize muscular activity, and in so doing minimizes any physiological uptake of FDG in the muscles. Hyperventilation may cause increased uptake in the: The diaphragm The peritoneum Leg muscles Arm muscles 3. The time from F-18 fluorodeoxyglucose (FDG) administration to the time of data acquisition has been shown to have a marked effect on FDG uptake. An increased interval between the injection and imaging uptake time will DECREASE radiotracer concentration in: Tumor. Muscle. Blood pool. Bone marrow. 4. A 65-year-old patient is referred for a brain PET/MR study. The referring physician reports placement of a titanium alloy brain clips for an intracranial aneurysm 5 years ago. Which of the following would be the most appropriate action regarding imaging this case? Perform the study regardless the system type or field strength Perform PET only. It is contraindicated to perform the exam as titanium alloy is ferromagnetic Perform the exam using 0.5 Tesla systems or less 5. All of the following cellular mechanisms are responsible for malignant cells increased F-18 fluorodeoxyglucose accumulation EXCEPT: Increased membrane transporters. Low glucose-6-phosphatase. Increased intracellular hexokinase. Low mitotic rate. 6. The term “partial volume effect” is caused by the limited resolution of PET scanners and refers to phenomenon that make intensity values in images differ from what they ideally should be. The “hot” spot smaller than twice the resolution of the scanner will have total counts preserved and will appear: Larger with a lower activity concentration Larger with a higher activity concentration Smaller with a lower activity concentration Smaller with a higher activity concentration 7. A patient is required to extend the arms above the head during a PET/CT scan. Which of the following is the possible reason? Helps the patient to hold breath Reduces possible artifact formation Minimizes the patient's movement during the Scan Maximizes extension of the spine 8. Which of the following radionuclides used in PET imaging produces the highest resolution images? N-13. C-11. F-18. Rb-82. 9. F-18 is a cyclotron-produced radioisotope with a half-life approximately of: 11 min. 119 min. 110 min. 101 min. 10. F-18 FDG uptake in tumors correlates with tumor: Volume and stability. Shape and reproducibility. Size and contractility. Growth and viability. 1 out of 10 Time's upTime is Up! By Nasser AlMutairi|2021-09-20T13:16:27+03:00April 15th, 2021|Positron Emission Tomography| Share This Post With Others! FacebookXLinkedInWhatsAppPinterestEmail About the Author: Nasser AlMutairi Senior Nuclear Medicine Specialist at Hafar Al-Batin Central Hospital, Founder of NuclearMed Website. Leave a ReplyCancel reply
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