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. The concentration of glucose-6-phosphatase, an enzyme mediating dephosphorylation of FDG-6-phosphate, is low in most tumors EXCEPT: Hodgkin lymphoma. Lung adenocarcinoma. Hepatocellular carcinoma. Ductal carcinoma. None 2. 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: Muscle. Tumor. Blood pool. Bone marrow. None 3. F-18 is a cyclotron-produced radioisotope with a half-life approximately of: 11 min. 110 min. 119 min. 101 min. None 4. 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: Arm muscles Leg muscles The diaphragm The peritoneum None 5. 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 Minimizes the patient's movement during the Scan Maximizes extension of the spine Reduces possible artifact formation None 6. With the administration of oral contrast media for integrated Positron Emission Tomography/Computed Tomography (PET/CT) studies, CT-derived attenuation values are: Not performed Overestimated Underestimated Not applicable None 7. 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 higher activity concentration Larger with a lower activity concentration Smaller with a higher activity concentration Smaller with a lower activity concentration None 8. All of the following scintigraphic methods are often used in the diagnosis of fever of unknown origin (FUO) EXCEPT: Fluorodeoxyglucose-positron emission tomography (FDG-PET) Labeled leukocytes scintigraphy Ga-67 citrate scintigraphy Labeled erythrocytes scintigraphy None 9. The elevated serum glucose level at the time of fluorodeoxyglucose (FDG) administration may decrease the sensitivity of the FDG-PET study. Althoguh intravenous bolus of insulin may effectively lower the serum glucose level, however induced hyperinsulinemia will: Increase blood pressure. Shunt glucose to skeletal and cardiac muscles. Decrease heart rate. Induce hyperglycemia. None 10. The usefulness of F-18 FDG PET in infection imaging is based on the fact that granulocytes and macrophages in infectious foci: Have high insulin production Have high glucose consumption Have short life span Have high mitotic rate None 1 out of 10 Time's upTime is Up! By Nasser AlMutairi|2021-09-20T13:16:27+03:00April 15th, 2021|Positron Emission Tomography| شارك هذه الصفحة FacebookXLinkedInWhatsAppPinterestEmail About the Author: Nasser AlMutairi Senior Nuclear Medicine Specialist at Hafar Al-Batin Central Hospital, Founder of NuclearMed Website. Leave A Comment Cancel replyComment Notify me of follow-up comments by email. Notify me of new posts by email. Δ
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