اختبار: الأشعة البوزيتورنية 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. 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 negative and thyroglobulin (Tg) is negative. I-131 whole body scan is positive and thyroglobulin (Tg) is positive. I-131 whole body scan is positive and thyroglobulin (Tg) is negative. I-131 whole body scan is negative and thyroglobulin (Tg) is positive. 2. The majority of radiation exposure to personnel performing PET/CT procedures comes from the: Unopened dose pig PET scanner Injected patient CT scanner 3. 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: Shunt glucose to skeletal and cardiac muscles. Increase blood pressure. Induce hyperglycemia. Decrease heart rate. 4. The concentration of glucose-6-phosphatase, an enzyme mediating dephosphorylation of FDG-6-phosphate, is low in most tumors EXCEPT: Hodgkin lymphoma. Ductal carcinoma. Lung adenocarcinoma. Hepatocellular carcinoma. 5. The usefulness of F-18 FDG PET in infection imaging is based on the fact that granulocytes and macrophages in infectious foci: Have short life span Have high insulin production Have high mitotic rate Have high glucose consumption 6. 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 7. 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? It is contraindicated to perform the exam as titanium alloy is ferromagnetic Perform PET only. Perform the study regardless the system type or field strength Perform the exam using 0.5 Tesla systems or less 8. 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 Arm muscles Leg muscles The diaphragm 9. 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. 200 mg/dl. 155 mg/dl. 175 mg/dl. 10. F-18 is a cyclotron-produced radioisotope with a half-life approximately of: 110 min. 11 min. 119 min. 101 min. 1 out of 10 Time's upTime is Up! بواسطة ناصر المطيري|2021-09-20T14:26:18+03:00أبريل 15th, 2021|الأشعة البوزيترونية|لا توجد تعليقات شارك هذه الصفحة, واترك رأيك حول الموضوع باستخدام وسيلة التواصل التي تناسبك FacebookXLinkedInWhatsAppPinterestEmail عن: ناصر المطيري كبير أخصائيي الطب النووي في مستشفى حفر الباطن المركزي و مؤسس موقع نيوكليرمد. اترك تعليقاًCancel reply
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