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. 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 mitotic rate Have short life span Have high glucose consumption None 2. 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. None 3. The majority of radiation exposure to personnel performing PET/CT procedures comes from the: Injected patient Unopened dose pig CT scanner PET scanner None 4. F-18 FDG uptake in tumors correlates with tumor: Size and contractility. Growth and viability. Shape and reproducibility. Volume and stability. None 5. 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 The diaphragm Leg muscles The peritoneum None 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? Maximizes extension of the spine Minimizes the patient's movement during the Scan Helps the patient to hold breath Reduces possible artifact formation None 7. All of the following cellular mechanisms are responsible for malignant cells increased F-18 fluorodeoxyglucose accumulation EXCEPT: Low mitotic rate. Increased intracellular hexokinase. Low glucose-6-phosphatase. Increased membrane transporters. None 8. 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 higher activity concentration Smaller with a lower activity concentration None 9. Which of the following radionuclides used in PET imaging produces the highest resolution images? F-18. N-13. C-11. Rb-82. None 10. F-18 is a cyclotron-produced radioisotope with a half-life approximately of: 101 min. 119 min. 11 min. 110 min. None 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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