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. A patient is required to extend the arms above the head during a PET/CT scan. Which of the following is the possible reason? Minimizes the patient's movement during the Scan Maximizes extension of the spine Reduces possible artifact formation Helps the patient to hold breath 2. 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 positive. I-131 whole body scan is negative and thyroglobulin (Tg) is positive. I-131 whole body scan is negative and thyroglobulin (Tg) is negative. I-131 whole body scan is positive and thyroglobulin (Tg) is negative. 3. 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: 120 mg/dl. 155 mg/dl. 200 mg/dl. 175 mg/dl. 4. The majority of radiation exposure to personnel performing PET/CT procedures comes from the: Unopened dose pig CT scanner Injected patient PET scanner 5. With the administration of oral contrast media for integrated Positron Emission Tomography/Computed Tomography (PET/CT) studies, CT-derived attenuation values are: Underestimated Not performed Overestimated Not applicable 6. 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 peritoneum The diaphragm Leg muscles Arm muscles 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 Smaller with a lower activity concentration Smaller with a higher activity concentration Larger with a lower activity concentration 8. The concentration of glucose-6-phosphatase, an enzyme mediating dephosphorylation of FDG-6-phosphate, is low in most tumors EXCEPT: Hepatocellular carcinoma. Hodgkin lymphoma. Lung adenocarcinoma. Ductal carcinoma. 9. All of the following cellular mechanisms are responsible for malignant cells increased F-18 fluorodeoxyglucose accumulation EXCEPT: Increased membrane transporters. Low mitotic rate. Low glucose-6-phosphatase. Increased intracellular hexokinase. 10. F-18 FDG uptake in tumors correlates with tumor: Shape and reproducibility. Growth and viability. Size and contractility. Volume and stability. 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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