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: Ductal carcinoma. Hepatocellular carcinoma. Lung adenocarcinoma. Hodgkin lymphoma. 2. With the administration of oral contrast media for integrated Positron Emission Tomography/Computed Tomography (PET/CT) studies, CT-derived attenuation values are: Overestimated Not performed Underestimated Not applicable 3. The usefulness of F-18 FDG PET in infection imaging is based on the fact that granulocytes and macrophages in infectious foci: Have high mitotic rate Have high glucose consumption Have high insulin production Have short life span 4. High glucose levels may interfere with tumor targeting due to competitive inhibition of FDG uptake by d-glucose. FDG-PET study should not be recommended when the glucose level in the blood exceeds: 155 mg/dl. 120 mg/dl. 175 mg/dl. 200 mg/dl. 5. 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. Decrease heart rate. Induce hyperglycemia. Shunt glucose to skeletal and cardiac muscles. 6. Localizing metastatic disease in thyroid cancer patients with F-18 fluorodeoxyglucose (FDG) PET imaging is the primary clinical indication if: I-131 whole body scan is positive and thyroglobulin (Tg) is negative. I-131 whole body scan is negative and thyroglobulin (Tg) is positive. I-131 whole body scan is positive and thyroglobulin (Tg) is positive. I-131 whole body scan is negative and thyroglobulin (Tg) is negative. 7. F-18 FDG uptake in tumors correlates with tumor: Size and contractility. Shape and reproducibility. Volume and stability. Growth and viability. 8. F-18 is a cyclotron-produced radioisotope with a half-life approximately of: 110 min. 11 min. 119 min. 101 min. 9. 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: Blood pool. Muscle. Bone marrow. Tumor. 10. A patient is required to extend the arms above the head during a PET/CT scan. Which of the following is the possible reason? Maximizes extension of the spine Helps the patient to hold breath Reduces possible artifact formation Minimizes the patient's movement during the Scan 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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