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 lower activity concentration Larger with a higher activity concentration Larger with a lower activity concentration Smaller with a higher activity concentration 2. Which of the following radionuclides used in PET imaging produces the highest resolution images? F-18. Rb-82. N-13. C-11. 3. 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. 4. 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: Tumor. Muscle. Bone marrow. Blood pool. 5. With the administration of oral contrast media for integrated Positron Emission Tomography/Computed Tomography (PET/CT) studies, CT-derived attenuation values are: Not performed Not applicable Overestimated Underestimated 6. 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: 200 mg/dl. 155 mg/dl. 175 mg/dl. 120 mg/dl. 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 diaphragm Arm muscles The peritoneum Leg muscles 8. F-18 FDG uptake in tumors correlates with tumor: Size and contractility. Shape and reproducibility. Volume and stability. Growth and viability. 9. 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 short life span Have high glucose consumption Have high insulin production 10. All of the following cellular mechanisms are responsible for malignant cells increased F-18 fluorodeoxyglucose accumulation EXCEPT: Low glucose-6-phosphatase. Increased intracellular hexokinase. Low mitotic rate. Increased membrane transporters. 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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