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 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: Smaller with a higher activity concentration Larger with a lower activity concentration Smaller with a lower activity concentration Larger with a higher activity concentration 2. F-18 FDG uptake in tumors correlates with tumor: Growth and viability. Shape and reproducibility. Volume and stability. Size and contractility. 3. 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: Bone marrow. Muscle. Blood pool. Tumor. 4. 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: Induce hyperglycemia. Shunt glucose to skeletal and cardiac muscles. Increase blood pressure. Decrease heart rate. 5. 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 negative. I-131 whole body scan is positive and thyroglobulin (Tg) is positive. I-131 whole body scan is negative and thyroglobulin (Tg) is positive. 6. 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. 7. 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 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) Ga-67 citrate scintigraphy Labeled erythrocytes scintigraphy Labeled leukocytes scintigraphy 9. The concentration of glucose-6-phosphatase, an enzyme mediating dephosphorylation of FDG-6-phosphate, is low in most tumors EXCEPT: Hepatocellular carcinoma. Hodgkin lymphoma. Ductal carcinoma. Lung adenocarcinoma. 10. The majority of radiation exposure to personnel performing PET/CT procedures comes from the: Injected patient Unopened dose pig PET scanner CT scanner 1 out of 10 Time is Up! Time's 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 FacebookTwitterLinkedInWhatsAppPinterestEmail عن: ناصر المطيري كبير أخصائيي الطب النووي في مستشفى حفر الباطن المركزي و مؤسس موقع نيوكليرمد و عضو اللجنة التنفيذية في الجمعية السعودية للطب النووي و التصوير الجزيئي. اترك تعليقاً Cancel reply
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